SEC Info  
    Home      Search      My Interests      Help      Sign In      Please Sign In

Unitedhealth Group Inc – ‘10-K’ for 12/31/13 – ‘EX-101.DEF’

On:  Wednesday, 2/12/14, at 4:32pm ET   ·   For:  12/31/13   ·   Accession #:  731766-14-8   ·   File #:  1-10864

Previous ‘10-K’:  ‘10-K’ on 2/7/13 for 12/31/12   ·   Next:  ‘10-K’ on 2/10/15 for 12/31/14   ·   Latest:  ‘10-K’ on 2/28/24 for 12/31/23   ·   1 Reference:  By:  UnitedHealth Group Inc. – ‘10-K’ on 2/15/22 for 12/31/21

Find Words in Filings emoji
 
  in    Show  and   Hints

  As Of               Filer                 Filing    For·On·As Docs:Size

 2/12/14  Unitedhealth Group Inc            10-K       12/31/13  115:25M

Annual Report   —   Form 10-K   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   1.48M 
 2: EX-10.2     Material Contract                                   HTML     85K 
 3: EX-10.3     Material Contract                                   HTML     92K 
 4: EX-10.34    Material Contract                                   HTML     79K 
 6: EX-21.1     Subsidiaries List                                   HTML    166K 
 7: EX-23.1     Consent of Experts or Counsel                       HTML     35K 
 8: EX-24.1     Power of Attorney                                   HTML     43K 
 5: EX-12.1     Statement re: Computation of Ratios                 HTML     47K 
 9: EX-31.1     Certification -- §302 - SOA'02                      HTML     50K 
10: EX-32.1     Certification -- §906 - SOA'02                      HTML     39K 
78: R1          Document and Entity Information Document            HTML     65K 
62: R2          Consolidated Balance Sheets                         HTML    145K 
74: R3          Consolidated Balance Sheet (Parenthetical)          HTML     65K 
                Consolidated Balance Sheet (Parenthetical)                       
82: R4          Consolidated Statements of Operations               HTML    114K 
105: R5          Consolidated Statements of Comprehensive Income     HTML     76K  
64: R6          Consolidated Statements of Changes in               HTML     98K 
                Shareholders' Equity                                             
73: R7          Consolidated Statements of Cash Flows               HTML    142K 
56: R8          Description of Business (Notes)                     HTML     37K 
46: R9          Basis of Presentation, Use of Estimates and         HTML    117K 
                Significant Accounting Policies                                  
107: R10         Investments                                         HTML    284K  
84: R11         Fair Value                                          HTML    332K 
83: R12         Property, Plant, and Capitalized Software (Notes)   HTML     58K 
90: R13         Goodwill and Intangible Assets (Notes)              HTML    129K 
91: R14         Medical Cost and Medical Costs Payable              HTML     71K 
88: R15         Commercial Paper and Long-Term Debt                 HTML    249K 
92: R16         Income Taxes (Notes)                                HTML    157K 
75: R17         Shareholders' Equity Shareholder's Equity           HTML     60K 
79: R18         Share-Based Compensation                            HTML    118K 
86: R19         Commitments and Contingencies                       HTML     58K 
115: R20         Segment Financial Information                       HTML    294K  
100: R21         Quarterly Financial Data (Notes)                    HTML     85K  
69: R22         Schedule I (Notes)                                  HTML    194K 
85: R23         Basis of Presentation, Use of Estimates and         HTML    161K 
                Significant Accounting Policies (Policy)                         
71: R24         Fair Value Fair Value (Policies)                    HTML     50K 
37: R25         Income Taxes Income Taxes (Policies)                HTML     42K 
101: R26         Shareholders' Equity Shareholders' Equity           HTML     47K  
                (Policies)                                                       
111: R27         Share-Based Compensation Share-Based Compensation   HTML     49K  
                (Policies)                                                       
51: R28         Segment Financial Information Segment Financial     HTML     43K 
                Information (Policies)                                           
50: R29         Basis of Presentation, Use of Estimates and         HTML     76K 
                Significant Accounting Policies Basis of                         
                Presentation, Use of Estimates and Significant                   
                Accounting Policies (Tables)                                     
54: R30         Investments (Tables)                                HTML    283K 
55: R31         Fair Value (Tables)                                 HTML    324K 
57: R32         Property, Plant, and Capitalized Software (Tables)  HTML     58K 
26: R33         Goodwill and Intangible Assets (Tables)             HTML    127K 
98: R34         Medical Cost and Medical Costs Payable Medical      HTML     72K 
                Cost and Medical Costs Payable (Tables)                          
67: R35         Commercial Paper and Long-Term Debt (Tables)        HTML    253K 
70: R36         Income Taxes (Tables)                               HTML    156K 
41: R37         Shareholders' Equity Shareholder's Equity (Tables)  HTML     43K 
114: R38         Share-Based Compensation (Tables)                   HTML    118K  
17: R39         Commitments and Contingencies Commitments and       HTML     44K 
                Contingencies (Tables)                                           
59: R40         Segment Financial Information (Tables)              HTML    279K 
104: R41         Quarterly Financial Data (Tables)                   HTML     85K  
39: R42         Schedule I (Tables)                                 HTML    198K 
49: R43         Basis of Presentation, Use of Estimates and         HTML     82K 
                Significant Accounting Policies Narrative                        
                (Details)                                                        
53: R44         Basis of Presentation, Use of Estimates and         HTML     40K 
                Significant Accounting Policies Basis of                         
                Presentation, Use of Estimates and Significant                   
                Accounting Policies Medicare Part D (Details)                    
63: R45         Basis of Presentation, Use of Estimates and         HTML     41K 
                Significant Accounting Policies Basis of                         
                Presentation, Use of Estimates and Significant                   
                Accounting Policies Useful lives for property,                   
                equipment and capitalized software (Details)                     
25: R46         Investments (Narrative) (Details)                   HTML     36K 
45: R47         Investments (Short-Term and Long-Term Investments)  HTML     86K 
                (Details)                                                        
19: R48         Investments (Fair Value of Mortgage-Backed          HTML     52K 
                Securities by Credit Rating Origination) (Details)               
103: R49         Investments (Amortized Cost and Fair Value of       HTML     73K  
                Available-for-Sale Debt Securities by Contractual                
                Maturity) (Details)                                              
38: R50         Investments (Amortized Cost and Fair Value of       HTML     65K 
                Held-To-Maturity Debt Securities by Contractual                  
                Maturity) (Details)                                              
99: R51         Investments (Fair Value of Available-For-Sale       HTML     63K 
                Investments with Gross Unrealized Losses by                      
                Investment Type and Length of Time That Individual               
                Securities Have Been in a Continuous Unrealized                  
                Loss Position) (Details)                                         
42: R52         Investments (Net Realized Gains) (Details)          HTML     60K 
60: R53         Fair Value (Narrative) (Details)                    HTML     53K 
18: R54         Fair Value (Financial Assets and Liabilities,       HTML     79K 
                Excluding AARP, Measured at Fair Value on a                      
                Recurring Basis) (Details)                                       
22: R55         Fair Value (Financial Assets and Liabilities,       HTML     54K 
                Excluding AARP, Not Measured at Fair Value on a                  
                Recurring Basis) (Details)                                       
52: R56         Fair Value (Reconciliation of Assets Measured at    HTML     62K 
                Fair Value on a Recurring Basis Using Level 3                    
                Inputs) (Details)                                                
30: R57         Fair Value Fair Value Inputs Assets Quantitative    HTML     42K 
                Information (Details)                                            
108: R58         Fair Value (Assets and Liabilities measured at      HTML     77K  
                fair value on a recurring basis) (Details)                       
66: R59         Property, Plant, and Capitalized Software           HTML     39K 
                (Details)                                                        
89: R60         Property, Plant, and Capitalized Software           HTML     60K 
                Property, Equipment, and Capitalized Software                    
                Property, Equipment, and Capitalized Software                    
                table (Details)                                                  
44: R61         Goodwill and Intangible Assets (Details)            HTML     72K 
47: R62         Goodwill and Intangible Assets Goodwill and         HTML     53K 
                Intangible Assets Changes in the Carrying Amount                 
                of Goodwill by Reporting Segment (Details)                       
96: R63         Goodwill and Intangible Assets Goodwill and         HTML     52K 
                Intangible Assets Gross carrying value,                          
                accumulated amortization and net carrying value of               
                intangible assets (Details)                                      
93: R64         Goodwill and Intangible Assets Goodwill and         HTML     43K 
                Intangible Assets Weighted-average useful lives                  
                assigned to finite-lived intangible assets                       
                acquired in business combinations (Details)                      
68: R65         Goodwill and Intangible Assets Goodwill and         HTML     46K 
                Intangible Assets Amortization Expense relating to               
                Intangible Assets (Details)                                      
95: R66         Medical Cost and Medical Costs Payable (Details)    HTML     35K 
43: R67         Medical Cost and Medical Costs Payable Medical      HTML     54K 
                Costs and Medical Costs Payable Rollforward                      
                (Details)                                                        
72: R68         Commercial Paper and Long-Term Debt (Narrative)     HTML     59K 
                (Details)                                                        
110: R69         Commercial Paper and Long-Term Debt (Details)       HTML    128K  
21: R70         Commercial Paper and Long-Term Debt Maturities of   HTML     48K 
                commercial paper and long-term debt (Details)                    
36: R71         Commercial Paper and Long-Term Debt Balance Sheet   HTML     43K 
                Location of Fair Value Derivatives (Details)                     
61: R72         Commercial Paper and Long-Term Debt Income          HTML     44K 
                Statement Recognition of Fair Value Hedge                        
                (Details)                                                        
28: R73         Income Taxes Narrative (Details)                    HTML     51K 
113: R74         Income Taxes Income Taxes Reconciliation of         HTML     54K  
                Provision for Income Taxes (Details)                             
40: R75         Income Taxes Income Tax Reconciliation of the tax   HTML     79K 
                provision at the U.S. Federal Statutory Rate                     
                (Details)                                                        
31: R76         Income Taxes Income Taxes Components of Deferred    HTML     94K 
                Tax Assets and Liabilities (Details)                             
35: R77         Income Taxes Income Taxes Reconciliation of the     HTML     50K 
                beginning and ending amount of unrecognized tax                  
                benefits (Details)                                               
23: R78         Shareholders' Equity Shareholder's Equity           HTML     67K 
                (Details)                                                        
27: R79         Shareholders' Equity Shareholder's Equity           HTML     38K 
                Dividends (Details)                                              
80: R80         Share-Based Compensation (Narrative) (Details)      HTML     39K 
33: R81         Share-Based Compensation (Stock Option and SAR      HTML     82K 
                Activity) (Details)                                              
109: R82         Share-Based Compensation (Restricted Share          HTML     57K  
                Activity) (Details)                                              
58: R83         Share-Based Compensation Other Share-Based          HTML     63K 
                Compensation Data (Details)                                      
87: R84         Share-Based Compensation (Share-Based Compensation  HTML     52K 
                Principal Fair Value Assumptions) (Details)                      
94: R85         Commitments and Contingencies (Details)             HTML     51K 
32: R86         Commitments and Contingencies Commitments and       HTML     49K 
                Contingencies Future Lease Payments (Details)                    
34: R87         Segment Financial Information Segment Financial     HTML     43K 
                Information (Narrative) (Details)                                
106: R88         Segment Financial Information (Details)             HTML    137K  
29: R89         Quarterly Financial Data Quarterly Financial Data   HTML     61K 
                (Unaudited) (Details)                                            
81: R90         Schedule I (Details)                                HTML     63K 
77: R91         Schedule I Condensed Balance Sheet (Details)        HTML    115K 
97: R92         Schedule I Condensed Balance Sheet (Parenthetical)  HTML     57K 
                (Details)                                                        
76: R93         Schedule I Condensed Income Statement (Details)     HTML     81K 
65: R94         Schedule I Condensed Cash Flow (Details)            HTML    104K 
102: R95         Schedule I Maturities of Commercial Paper and       HTML     48K  
                Long-Term Debt (Details)                                         
112: XML         IDEA XML File -- Filing Summary                      XML    180K  
20: EXCEL       IDEA Workbook of Financial Reports                  XLSX    450K 
48: EXCEL       IDEA Workbook of Financial Reports (.xls)            XLS   4.30M 
11: EX-101.INS  XBRL Instance -- unh-20131231                        XML   6.54M 
13: EX-101.CAL  XBRL Calculations -- unh-20131231_cal                XML    317K 
14: EX-101.DEF  XBRL Definitions -- unh-20131231_def                 XML   1.48M 
15: EX-101.LAB  XBRL Labels -- unh-20131231_lab                      XML   2.66M 
16: EX-101.PRE  XBRL Presentations -- unh-20131231_pre               XML   1.75M 
12: EX-101.SCH  XBRL Schema -- unh-20131231                          XSD    284K 
24: ZIP         XBRL Zipped Folder -- 0000731766-14-000008-xbrl      Zip    465K 


‘EX-101.DEF’   —   XBRL Definitions — unh-20131231_def


This Exhibit is an XBRL XML File.


                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<!-- XBRL Document Created with WebFilings -->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<roleRef roleURI="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPolicies" xlink:href="unh-20131231.xsd#BasisOfPresentationUseOfEstimatesAndSignificantAccountingPolicies" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesBasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesMedicarePartDDetails" xlink:href="unh-20131231.xsd#BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesBasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesMedicarePartDDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesBasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesTables" xlink:href="unh-20131231.xsd#BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesBasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesBasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesUsefulLivesForPropertyEquipmentAndCapitalizedSoftwareDetails" xlink:href="unh-20131231.xsd#BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesBasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesUsefulLivesForPropertyEquipmentAndCapitalizedSoftwareDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesNarrativeDetails" xlink:href="unh-20131231.xsd#BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesPolicy" xlink:href="unh-20131231.xsd#BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesPolicy" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommercialPaperAndLongTermDebt" xlink:href="unh-20131231.xsd#CommercialPaperAndLongTermDebt" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommercialPaperAndLongTermDebtBalanceSheetLocationOfFairValueDerivativesDetails" xlink:href="unh-20131231.xsd#CommercialPaperAndLongTermDebtBalanceSheetLocationOfFairValueDerivativesDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommercialPaperAndLongTermDebtDetails" xlink:href="unh-20131231.xsd#CommercialPaperAndLongTermDebtDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommercialPaperAndLongTermDebtIncomeStatementRecognitionOfFairValueHedgeDetails" xlink:href="unh-20131231.xsd#CommercialPaperAndLongTermDebtIncomeStatementRecognitionOfFairValueHedgeDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommercialPaperAndLongTermDebtMaturitiesOfCommercialPaperAndLongTermDebtDetails" xlink:href="unh-20131231.xsd#CommercialPaperAndLongTermDebtMaturitiesOfCommercialPaperAndLongTermDebtDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommercialPaperAndLongTermDebtNarrativeDetails" xlink:href="unh-20131231.xsd#CommercialPaperAndLongTermDebtNarrativeDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommercialPaperAndLongTermDebtPolicyPolicies" xlink:href="unh-20131231.xsd#CommercialPaperAndLongTermDebtPolicyPolicies" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommercialPaperAndLongTermDebtTables" xlink:href="unh-20131231.xsd#CommercialPaperAndLongTermDebtTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommitmentsAndContingencies" xlink:href="unh-20131231.xsd#CommitmentsAndContingencies" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommitmentsAndContingenciesCommitmentsAndContingenciesFutureLeasePaymentsDetails" xlink:href="unh-20131231.xsd#CommitmentsAndContingenciesCommitmentsAndContingenciesFutureLeasePaymentsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommitmentsAndContingenciesCommitmentsAndContingenciesTables" xlink:href="unh-20131231.xsd#CommitmentsAndContingenciesCommitmentsAndContingenciesTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/CommitmentsAndContingenciesDetails" xlink:href="unh-20131231.xsd#CommitmentsAndContingenciesDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ConsolidatedBalanceSheetParentheticalConsolidatedBalanceSheetParenthetical" xlink:href="unh-20131231.xsd#ConsolidatedBalanceSheetParentheticalConsolidatedBalanceSheetParenthetical" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ConsolidatedBalanceSheets" xlink:href="unh-20131231.xsd#ConsolidatedBalanceSheets" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="unh-20131231.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" xlink:href="unh-20131231.xsd#ConsolidatedStatementsOfChangesInShareholdersEquity" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:href="unh-20131231.xsd#ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ConsolidatedStatementsOfOperations" xlink:href="unh-20131231.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/DescriptionOfBusinessDetails" xlink:href="unh-20131231.xsd#DescriptionOfBusinessDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/DescriptionOfBusinessNotes" xlink:href="unh-20131231.xsd#DescriptionOfBusinessNotes" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/DescriptionOfBusinessTables" xlink:href="unh-20131231.xsd#DescriptionOfBusinessTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/DocumentAndEntityInformationDocument" xlink:href="unh-20131231.xsd#DocumentAndEntityInformationDocument" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/FairValue" xlink:href="unh-20131231.xsd#FairValue" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="unh-20131231.xsd#FairValueAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/FairValueFairValueInputsAssetsQuantitativeInformationDetails" xlink:href="unh-20131231.xsd#FairValueFairValueInputsAssetsQuantitativeInformationDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/FairValueFairValuePolicies" xlink:href="unh-20131231.xsd#FairValueFairValuePolicies" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/FairValueFinancialAssetsAndLiabilitiesExcludingAarpMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="unh-20131231.xsd#FairValueFinancialAssetsAndLiabilitiesExcludingAarpMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/FairValueFinancialAssetsAndLiabilitiesExcludingAarpNotMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="unh-20131231.xsd#FairValueFinancialAssetsAndLiabilitiesExcludingAarpNotMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/FairValueNarrativeDetails" xlink:href="unh-20131231.xsd#FairValueNarrativeDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/FairValueReconciliationOfAssetsMeasuredAtFairValueOnRecurringBasisUsingLevel3InputsDetails" xlink:href="unh-20131231.xsd#FairValueReconciliationOfAssetsMeasuredAtFairValueOnRecurringBasisUsingLevel3InputsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/FairValueTables" xlink:href="unh-20131231.xsd#FairValueTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/GoodwillAndIntangibleAssetsDetails" xlink:href="unh-20131231.xsd#GoodwillAndIntangibleAssetsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsAmortizationExpenseRelatingToIntangibleAssetsDetails" xlink:href="unh-20131231.xsd#GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsAmortizationExpenseRelatingToIntangibleAssetsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsChangesInCarryingAmountOfGoodwillByReportingSegmentDetails" xlink:href="unh-20131231.xsd#GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsChangesInCarryingAmountOfGoodwillByReportingSegmentDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsGrossCarryingValueAccumulatedAmortizationAndNetCarryingValueOfIntangibleAssetsDetails" xlink:href="unh-20131231.xsd#GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsGrossCarryingValueAccumulatedAmortizationAndNetCarryingValueOfIntangibleAssetsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsWeightedAverageUsefulLivesAssignedToFiniteLivedIntangibleAssetsAcquiredInBusinessCombinationsDetails" xlink:href="unh-20131231.xsd#GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsWeightedAverageUsefulLivesAssignedToFiniteLivedIntangibleAssetsAcquiredInBusinessCombinationsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/GoodwillAndIntangibleAssetsNotes" xlink:href="unh-20131231.xsd#GoodwillAndIntangibleAssetsNotes" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/GoodwillAndIntangibleAssetsTables" xlink:href="unh-20131231.xsd#GoodwillAndIntangibleAssetsTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/IncomeTaxesIncomeTaxReconciliationOfTaxProvisionAtUSFederalStatutoryRateDetails" xlink:href="unh-20131231.xsd#IncomeTaxesIncomeTaxReconciliationOfTaxProvisionAtUSFederalStatutoryRateDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/IncomeTaxesIncomeTaxesComponentsOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:href="unh-20131231.xsd#IncomeTaxesIncomeTaxesComponentsOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/IncomeTaxesIncomeTaxesPolicies" xlink:href="unh-20131231.xsd#IncomeTaxesIncomeTaxesPolicies" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/IncomeTaxesIncomeTaxesReconciliationOfBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetails" xlink:href="unh-20131231.xsd#IncomeTaxesIncomeTaxesReconciliationOfBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/IncomeTaxesIncomeTaxesReconciliationOfProvisionForIncomeTaxesDetails" xlink:href="unh-20131231.xsd#IncomeTaxesIncomeTaxesReconciliationOfProvisionForIncomeTaxesDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/IncomeTaxesNarrativeDetails" xlink:href="unh-20131231.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/IncomeTaxesNotes" xlink:href="unh-20131231.xsd#IncomeTaxesNotes" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/IncomeTaxesTables" xlink:href="unh-20131231.xsd#IncomeTaxesTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/Investments" xlink:href="unh-20131231.xsd#Investments" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/InvestmentsAmortizedCostAndFairValueOfAvailableForSaleDebtSecuritiesByContractualMaturityDetails" xlink:href="unh-20131231.xsd#InvestmentsAmortizedCostAndFairValueOfAvailableForSaleDebtSecuritiesByContractualMaturityDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/InvestmentsAmortizedCostAndFairValueOfHeldToMaturityDebtSecuritiesByContractualMaturityDetails" xlink:href="unh-20131231.xsd#InvestmentsAmortizedCostAndFairValueOfHeldToMaturityDebtSecuritiesByContractualMaturityDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/InvestmentsFairValueOfAvailableForSaleInvestmentsWithGrossUnrealizedLossesByInvestmentTypeAndLengthOfTimeThatIndividualSecuritiesHaveBeenInContinuousUnrealizedLossPositionDetails" xlink:href="unh-20131231.xsd#InvestmentsFairValueOfAvailableForSaleInvestmentsWithGrossUnrealizedLossesByInvestmentTypeAndLengthOfTimeThatIndividualSecuritiesHaveBeenInContinuousUnrealizedLossPositionDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/InvestmentsFairValueOfMortgageBackedSecuritiesByCreditRatingOriginationDetails" xlink:href="unh-20131231.xsd#InvestmentsFairValueOfMortgageBackedSecuritiesByCreditRatingOriginationDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/InvestmentsNarrativeDetails" xlink:href="unh-20131231.xsd#InvestmentsNarrativeDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/InvestmentsNetRealizedGainsDetails" xlink:href="unh-20131231.xsd#InvestmentsNetRealizedGainsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/InvestmentsShortTermAndLongTermInvestmentsDetails" xlink:href="unh-20131231.xsd#InvestmentsShortTermAndLongTermInvestmentsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/InvestmentsTables" xlink:href="unh-20131231.xsd#InvestmentsTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/MedicalCostAndMedicalCostsPayable" xlink:href="unh-20131231.xsd#MedicalCostAndMedicalCostsPayable" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/MedicalCostAndMedicalCostsPayableDetails" xlink:href="unh-20131231.xsd#MedicalCostAndMedicalCostsPayableDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/MedicalCostAndMedicalCostsPayableMedicalCostAndMedicalCostsPayableTables" xlink:href="unh-20131231.xsd#MedicalCostAndMedicalCostsPayableMedicalCostAndMedicalCostsPayableTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/MedicalCostAndMedicalCostsPayableMedicalCostsAndMedicalCostsPayableRollforwardDetails" xlink:href="unh-20131231.xsd#MedicalCostAndMedicalCostsPayableMedicalCostsAndMedicalCostsPayableRollforwardDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/PropertyPlantAndCapitalizedSoftwareDetails" xlink:href="unh-20131231.xsd#PropertyPlantAndCapitalizedSoftwareDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/PropertyPlantAndCapitalizedSoftwareNotes" xlink:href="unh-20131231.xsd#PropertyPlantAndCapitalizedSoftwareNotes" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/PropertyPlantAndCapitalizedSoftwarePropertyEquipmentAndCapitalizedSoftwarePropertyEquipmentAndCapitalizedSoftwareTableDetails" xlink:href="unh-20131231.xsd#PropertyPlantAndCapitalizedSoftwarePropertyEquipmentAndCapitalizedSoftwarePropertyEquipmentAndCapitalizedSoftwareTableDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/PropertyPlantAndCapitalizedSoftwareTables" xlink:href="unh-20131231.xsd#PropertyPlantAndCapitalizedSoftwareTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/QuarterlyFinancialDataDetails" xlink:href="unh-20131231.xsd#QuarterlyFinancialDataDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/QuarterlyFinancialDataNotes" xlink:href="unh-20131231.xsd#QuarterlyFinancialDataNotes" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/QuarterlyFinancialDataQuarterlyFinancialDataUnauditedDetails" xlink:href="unh-20131231.xsd#QuarterlyFinancialDataQuarterlyFinancialDataUnauditedDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/QuarterlyFinancialDataTables" xlink:href="unh-20131231.xsd#QuarterlyFinancialDataTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ScheduleICondensedBalanceSheetDetails" xlink:href="unh-20131231.xsd#ScheduleICondensedBalanceSheetDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ScheduleICondensedBalanceSheetParentheticalDetails" xlink:href="unh-20131231.xsd#ScheduleICondensedBalanceSheetParentheticalDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ScheduleICondensedCashFlowDetails" xlink:href="unh-20131231.xsd#ScheduleICondensedCashFlowDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ScheduleICondensedIncomeStatementDetails" xlink:href="unh-20131231.xsd#ScheduleICondensedIncomeStatementDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ScheduleIDetails" xlink:href="unh-20131231.xsd#ScheduleIDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ScheduleIMaturitiesOfCommercialPaperAndLongTermDebtDetails" xlink:href="unh-20131231.xsd#ScheduleIMaturitiesOfCommercialPaperAndLongTermDebtDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ScheduleINotes" xlink:href="unh-20131231.xsd#ScheduleINotes" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ScheduleITables" xlink:href="unh-20131231.xsd#ScheduleITables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/SegmentFinancialInformation" xlink:href="unh-20131231.xsd#SegmentFinancialInformation" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/SegmentFinancialInformationDetails" xlink:href="unh-20131231.xsd#SegmentFinancialInformationDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/SegmentFinancialInformationSegmentFinancialInformationNarrativeDetails" xlink:href="unh-20131231.xsd#SegmentFinancialInformationSegmentFinancialInformationNarrativeDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/SegmentFinancialInformationSegmentFinancialInformationPolicies" xlink:href="unh-20131231.xsd#SegmentFinancialInformationSegmentFinancialInformationPolicies" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/SegmentFinancialInformationTables" xlink:href="unh-20131231.xsd#SegmentFinancialInformationTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareBasedCompensation" xlink:href="unh-20131231.xsd#ShareBasedCompensation" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareBasedCompensationNarrativeDetails" xlink:href="unh-20131231.xsd#ShareBasedCompensationNarrativeDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareBasedCompensationOtherShareBasedCompensationDataDetails" xlink:href="unh-20131231.xsd#ShareBasedCompensationOtherShareBasedCompensationDataDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareBasedCompensationRestrictedShareActivityDetails" xlink:href="unh-20131231.xsd#ShareBasedCompensationRestrictedShareActivityDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareBasedCompensationShareBasedCompensationPolicies" xlink:href="unh-20131231.xsd#ShareBasedCompensationShareBasedCompensationPolicies" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareBasedCompensationShareBasedCompensationPrincipalFairValueAssumptionsDetails" xlink:href="unh-20131231.xsd#ShareBasedCompensationShareBasedCompensationPrincipalFairValueAssumptionsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareBasedCompensationStockOptionAndSarActivityDetails" xlink:href="unh-20131231.xsd#ShareBasedCompensationStockOptionAndSarActivityDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareBasedCompensationTables" xlink:href="unh-20131231.xsd#ShareBasedCompensationTables" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareholdersEquityShareholdersEquity" xlink:href="unh-20131231.xsd#ShareholdersEquityShareholdersEquity" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareholdersEquityShareholdersEquityDetails" xlink:href="unh-20131231.xsd#ShareholdersEquityShareholdersEquityDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareholdersEquityShareholdersEquityDividendsDetails" xlink:href="unh-20131231.xsd#ShareholdersEquityShareholdersEquityDividendsDetails" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareholdersEquityShareholdersEquityPolicies" xlink:href="unh-20131231.xsd#ShareholdersEquityShareholdersEquityPolicies" xlink:type="simple"/>
<roleRef roleURI="http://www.uhc.com/role/ShareholdersEquityShareholdersEquityTables" xlink:href="unh-20131231.xsd#ShareholdersEquityShareholdersEquityTables" xlink:type="simple"/>
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple"/>
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple"/>
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple"/>
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple"/>
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple"/>
<definitionLink xlink:role="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPolicies" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesBasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesMedicarePartDDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_52F4C3545F57296E658E270EA47E154A" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_0C2647B0969287ED3A02270EA47E4E68" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_52F4C3545F57296E658E270EA47E154A" xlink:to="loc_us-gaap_StatementTable_0C2647B0969287ED3A02270EA47E4E68" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="unh-20131231.xsd#unh_MedicarePartDPharmacyBenefitsContractAxis" xlink:label="loc_unh_MedicarePartDPharmacyBenefitsContractAxis_B34CF13C24A244FB9388270EA47E59BF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_0C2647B0969287ED3A02270EA47E4E68" xlink:to="loc_unh_MedicarePartDPharmacyBenefitsContractAxis_B34CF13C24A244FB9388270EA47E59BF" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_MedicarePartDPharmacyBenefitsContractDomain" xlink:label="loc_unh_MedicarePartDPharmacyBenefitsContractDomain_DE1E3907B4C4FB78FBF0270EA47E8C55_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_MedicarePartDPharmacyBenefitsContractAxis_B34CF13C24A244FB9388270EA47E59BF" xlink:to="loc_unh_MedicarePartDPharmacyBenefitsContractDomain_DE1E3907B4C4FB78FBF0270EA47E8C55_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_MedicarePartDPharmacyBenefitsContractDomain" xlink:label="loc_unh_MedicarePartDPharmacyBenefitsContractDomain_DE1E3907B4C4FB78FBF0270EA47E8C55" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_MedicarePartDPharmacyBenefitsContractAxis_B34CF13C24A244FB9388270EA47E59BF" xlink:to="loc_unh_MedicarePartDPharmacyBenefitsContractDomain_DE1E3907B4C4FB78FBF0270EA47E8C55" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CmsSubsidiesMember" xlink:label="loc_unh_CmsSubsidiesMember_D6D14DE3B891ACB8039F270EA47E6D6B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_MedicarePartDPharmacyBenefitsContractDomain_DE1E3907B4C4FB78FBF0270EA47E8C55" xlink:to="loc_unh_CmsSubsidiesMember_D6D14DE3B891ACB8039F270EA47E6D6B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_DrugDiscountMember" xlink:label="loc_unh_DrugDiscountMember_ED77FAF613BACBBCCB97270EA47E984D" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_MedicarePartDPharmacyBenefitsContractDomain_DE1E3907B4C4FB78FBF0270EA47E8C55" xlink:to="loc_unh_DrugDiscountMember_ED77FAF613BACBBCCB97270EA47E984D" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_RiskShareMember" xlink:label="loc_unh_RiskShareMember_E5D7015965881AD78102270EA47E3CF6" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_MedicarePartDPharmacyBenefitsContractDomain_DE1E3907B4C4FB78FBF0270EA47E8C55" xlink:to="loc_unh_RiskShareMember_E5D7015965881AD78102270EA47E3CF6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_63FA1A5705A382091A05270EA47E5A40" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F4C3545F57296E658E270EA47E154A" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_63FA1A5705A382091A05270EA47E5A40" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherPolicyholderFunds" xlink:label="loc_us-gaap_OtherPolicyholderFunds_3581FE53C96B2C03F6BD270EA47EC3C3" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F4C3545F57296E658E270EA47E154A" xlink:to="loc_us-gaap_OtherPolicyholderFunds_3581FE53C96B2C03F6BD270EA47EC3C3" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesBasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesTables" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesBasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesUsefulLivesForPropertyEquipmentAndCapitalizedSoftwareDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1C1BD05C2DCA33319DE7270EA468C9DD" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BE5CB7659FF3F4CAB443270EA4681778" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1C1BD05C2DCA33319DE7270EA468C9DD" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BE5CB7659FF3F4CAB443270EA4681778" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4C510B9F5BCE98CF3061270EA4684013" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BE5CB7659FF3F4CAB443270EA4681778" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4C510B9F5BCE98CF3061270EA4684013" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53A9C203320D0A88ED0B270EA468A9BC_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4C510B9F5BCE98CF3061270EA4684013" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53A9C203320D0A88ED0B270EA468A9BC_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53A9C203320D0A88ED0B270EA468A9BC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4C510B9F5BCE98CF3061270EA4684013" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53A9C203320D0A88ED0B270EA468A9BC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_0CA347A06CDFB32B05BA270EA468E072" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53A9C203320D0A88ED0B270EA468A9BC" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_0CA347A06CDFB32B05BA270EA468E072" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BuildingMember" xlink:label="loc_us-gaap_BuildingMember_55D773847D470446A5E7270EA468C9A0" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53A9C203320D0A88ED0B270EA468A9BC" xlink:to="loc_us-gaap_BuildingMember_55D773847D470446A5E7270EA468C9A0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_DCB96AB927A390C47CD8270EA468E3BE" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53A9C203320D0A88ED0B270EA468A9BC" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_DCB96AB927A390C47CD8270EA468E3BE" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CapitalizedSoftwareMember" xlink:label="loc_unh_CapitalizedSoftwareMember_A3C782066975A1AD356E270EA4685042" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53A9C203320D0A88ED0B270EA468A9BC" xlink:to="loc_unh_CapitalizedSoftwareMember_A3C782066975A1AD356E270EA4685042" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_5B861F024FD6A95F0443270EA46836E7" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BE5CB7659FF3F4CAB443270EA4681778" xlink:to="loc_us-gaap_RangeAxis_5B861F024FD6A95F0443270EA46836E7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_0432416F09BBE569DC3E270EA468B47C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_5B861F024FD6A95F0443270EA46836E7" xlink:to="loc_us-gaap_RangeMember_0432416F09BBE569DC3E270EA468B47C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_0432416F09BBE569DC3E270EA468B47C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_5B861F024FD6A95F0443270EA46836E7" xlink:to="loc_us-gaap_RangeMember_0432416F09BBE569DC3E270EA468B47C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_2CCF7E27F97748E9BE6C270EA4683E5C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_0432416F09BBE569DC3E270EA468B47C" xlink:to="loc_us-gaap_MinimumMember_2CCF7E27F97748E9BE6C270EA4683E5C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_D6DE9DC6F2F6E9E6E083270EA4684FAA" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_0432416F09BBE569DC3E270EA468B47C" xlink:to="loc_us-gaap_MaximumMember_D6DE9DC6F2F6E9E6E083270EA4684FAA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_BCE4B950CE6D1890B2EC270EA46919F7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1C1BD05C2DCA33319DE7270EA468C9DD" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_BCE4B950CE6D1890B2EC270EA46919F7" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_4C359DB43770E5419F05270EA4AEE513" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_StatementTable_4C359DB43770E5419F05270EA4AEE513" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="unh-20131231.xsd#unh_StepAquisitionAxis" xlink:label="loc_unh_StepAquisitionAxis_266FA4C68AD22A472CD1270EA4B47EFF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4C359DB43770E5419F05270EA4AEE513" xlink:to="loc_unh_StepAquisitionAxis_266FA4C68AD22A472CD1270EA4B47EFF" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_StepAquisitionDomain" xlink:label="loc_unh_StepAquisitionDomain_BABA06F7C5B5E2065B62270EA4B4348B_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_StepAquisitionAxis_266FA4C68AD22A472CD1270EA4B47EFF" xlink:to="loc_unh_StepAquisitionDomain_BABA06F7C5B5E2065B62270EA4B4348B_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_StepAquisitionDomain" xlink:label="loc_unh_StepAquisitionDomain_BABA06F7C5B5E2065B62270EA4B4348B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_StepAquisitionAxis_266FA4C68AD22A472CD1270EA4B47EFF" xlink:to="loc_unh_StepAquisitionDomain_BABA06F7C5B5E2065B62270EA4B4348B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_StepOneMember" xlink:label="loc_unh_StepOneMember_6F148F1B8166369EC093270EA4B40CBB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_StepAquisitionDomain_BABA06F7C5B5E2065B62270EA4B4348B" xlink:to="loc_unh_StepOneMember_6F148F1B8166369EC093270EA4B40CBB" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_StepTwoMember" xlink:label="loc_unh_StepTwoMember_F9A1705AAA9AC5476704270EA4B499EC" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_StepAquisitionDomain_BABA06F7C5B5E2065B62270EA4B4348B" xlink:to="loc_unh_StepTwoMember_F9A1705AAA9AC5476704270EA4B499EC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_C65674BE04360CEBD039270EA4B4819A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4C359DB43770E5419F05270EA4AEE513" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_C65674BE04360CEBD039270EA4B4819A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6753622944F7400A1EF5270EA4B4B3C0_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_C65674BE04360CEBD039270EA4B4819A" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6753622944F7400A1EF5270EA4B4B3C0_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6753622944F7400A1EF5270EA4B4B3C0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_C65674BE04360CEBD039270EA4B4819A" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6753622944F7400A1EF5270EA4B4B3C0" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AmilParticipacoesSAMember" xlink:label="loc_unh_AmilParticipacoesSAMember_F251B7CB4DF71F125EF4270EA4B5219C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6753622944F7400A1EF5270EA4B4B3C0" xlink:to="loc_unh_AmilParticipacoesSAMember_F251B7CB4DF71F125EF4270EA4B5219C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_51C13A521E48C5C201D1270EA4B55F35" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4C359DB43770E5419F05270EA4AEE513" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_51C13A521E48C5C201D1270EA4B55F35" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_FB7149E2123865AECF87270EA4B5436C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_51C13A521E48C5C201D1270EA4B55F35" xlink:to="loc_us-gaap_EquityComponentDomain_FB7149E2123865AECF87270EA4B5436C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_FB7149E2123865AECF87270EA4B5436C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_51C13A521E48C5C201D1270EA4B55F35" xlink:to="loc_us-gaap_EquityComponentDomain_FB7149E2123865AECF87270EA4B5436C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_D06B5AF4092C6232FE77270EA4B5F67B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_FB7149E2123865AECF87270EA4B5436C" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_D06B5AF4092C6232FE77270EA4B5F67B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_85A3F0F843486342035C270EA4B5CB7E" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4C359DB43770E5419F05270EA4AEE513" xlink:to="loc_us-gaap_RangeAxis_85A3F0F843486342035C270EA4B5CB7E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_151F442B5173CDF20AEF270EA4B5E1B9_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_85A3F0F843486342035C270EA4B5CB7E" xlink:to="loc_us-gaap_RangeMember_151F442B5173CDF20AEF270EA4B5E1B9_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_151F442B5173CDF20AEF270EA4B5E1B9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_85A3F0F843486342035C270EA4B5CB7E" xlink:to="loc_us-gaap_RangeMember_151F442B5173CDF20AEF270EA4B5E1B9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_D726BDB31327B967485C270EA4B5887C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_151F442B5173CDF20AEF270EA4B5E1B9" xlink:to="loc_us-gaap_MinimumMember_D726BDB31327B967485C270EA4B5887C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_CD19512EFB289F580438270EA4B58278" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_151F442B5173CDF20AEF270EA4B5E1B9" xlink:to="loc_us-gaap_MaximumMember_CD19512EFB289F580438270EA4B58278" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_AF869F24346A81909ECB270EA4B5F622" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4C359DB43770E5419F05270EA4AEE513" xlink:to="loc_us-gaap_AwardTypeAxis_AF869F24346A81909ECB270EA4B5F622" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58F8270928B30E4EDA6A270EA4B64834_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_AF869F24346A81909ECB270EA4B5F622" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58F8270928B30E4EDA6A270EA4B64834_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58F8270928B30E4EDA6A270EA4B64834" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_AF869F24346A81909ECB270EA4B5F622" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58F8270928B30E4EDA6A270EA4B64834" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_EmployeeStockPurchasePlanEsppDomain" xlink:label="loc_unh_EmployeeStockPurchasePlanEsppDomain_8E1BD371DBB0A88E7065270EA4B6E7EE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58F8270928B30E4EDA6A270EA4B64834" xlink:to="loc_unh_EmployeeStockPurchasePlanEsppDomain_8E1BD371DBB0A88E7065270EA4B6E7EE" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_StockOptionsAndSarsMemberMember" xlink:label="loc_unh_StockOptionsAndSarsMemberMember_75B15ADAB20BF6515A96270EA4BB65D3" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58F8270928B30E4EDA6A270EA4B64834" xlink:to="loc_unh_StockOptionsAndSarsMemberMember_75B15ADAB20BF6515A96270EA4BB65D3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_B4AF0C40CDF0371669D7270EA4BB6698" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58F8270928B30E4EDA6A270EA4B64834" xlink:to="loc_us-gaap_RestrictedStockMember_B4AF0C40CDF0371669D7270EA4BB6698" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_56F39E6D45AA7A021EBF270EA4BB438A" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4C359DB43770E5419F05270EA4AEE513" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_56F39E6D45AA7A021EBF270EA4BB438A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_278C29FFF7A6CA746246270EA4BB342D_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_56F39E6D45AA7A021EBF270EA4BB438A" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_278C29FFF7A6CA746246270EA4BB342D_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_278C29FFF7A6CA746246270EA4BB342D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_56F39E6D45AA7A021EBF270EA4BB438A" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_278C29FFF7A6CA746246270EA4BB342D" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ChecksOutstandingMember" xlink:label="loc_unh_ChecksOutstandingMember_8026C384F3A6A5F87094270EA4BC6BAA" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_278C29FFF7A6CA746246270EA4BB342D" xlink:to="loc_unh_ChecksOutstandingMember_8026C384F3A6A5F87094270EA4BC6BAA" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_RSFAssetsUnderManagementAARPMember" xlink:label="loc_unh_RSFAssetsUnderManagementAARPMember_DB20B9A7C2AB3C8611A1270EA4BCA60A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_278C29FFF7A6CA746246270EA4BB342D" xlink:to="loc_unh_RSFAssetsUnderManagementAARPMember_DB20B9A7C2AB3C8611A1270EA4BCA60A" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ReinsuranceReceivableNoncurrentMember" xlink:label="loc_unh_ReinsuranceReceivableNoncurrentMember_48BAB0F1172D859F7CFE270EA4BC80B6" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_278C29FFF7A6CA746246270EA4BB342D" xlink:to="loc_unh_ReinsuranceReceivableNoncurrentMember_48BAB0F1172D859F7CFE270EA4BC80B6" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ReinsuranceReceivableCurrentMember" xlink:label="loc_unh_ReinsuranceReceivableCurrentMember_C5AC123D078B92331B3D270EA4BCA37C" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_278C29FFF7A6CA746246270EA4BB342D" xlink:to="loc_unh_ReinsuranceReceivableCurrentMember_C5AC123D078B92331B3D270EA4BCA37C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_6C533DAAEC5696FB3582270EA4BC261D" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_278C29FFF7A6CA746246270EA4BB342D" xlink:to="loc_us-gaap_NoncontrollingInterestMember_6C533DAAEC5696FB3582270EA4BC261D" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_RateStabilizationFund" xlink:label="loc_unh_RateStabilizationFund_5FD56AD115FC87943B8F270EA4BC535A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_unh_RateStabilizationFund_5FD56AD115FC87943B8F270EA4BC535A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_6D30C8C4117FA90275BA270EA4BC69C8" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_6D30C8C4117FA90275BA270EA4BC69C8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate_376F1C1A9B013E2AB699270EA4BC8FEC" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate_376F1C1A9B013E2AB699270EA4BC8FEC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReinsuranceReceivablesPaidLossesRecoverable" xlink:label="loc_us-gaap_ReinsuranceReceivablesPaidLossesRecoverable_F0B22097518335CBE477270EA4C24259" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_ReinsuranceReceivablesPaidLossesRecoverable_F0B22097518335CBE477270EA4C24259" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentIncomeInterestAndDividend" xlink:label="loc_us-gaap_InvestmentIncomeInterestAndDividend_67C1D85447A5D9074FC3270EA4C2153E" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_InvestmentIncomeInterestAndDividend_67C1D85447A5D9074FC3270EA4C2153E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_9B9B9B7582CEE4376771270EA4C2D10A" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_9B9B9B7582CEE4376771270EA4C2D10A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_9568FA6AA162D520E4ED270EA4C22528" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_9568FA6AA162D520E4ED270EA4C22528" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_B109BF7A1BC12EA91D1F270EA4C2EE14" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_B109BF7A1BC12EA91D1F270EA4C2EE14" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestPeriodIncreaseDecrease" xlink:label="loc_us-gaap_MinorityInterestPeriodIncreaseDecrease_5D7508C478735428260B270EA4C2A2F6" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_MinorityInterestPeriodIncreaseDecrease_5D7508C478735428260B270EA4C2A2F6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_7E2C8E37AF5C68177266270EA4C28F23" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_7E2C8E37AF5C68177266270EA4C28F23" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_NumberOfDaysNoticeRequiredToCancelHealthInsuranceContract" xlink:label="loc_unh_NumberOfDaysNoticeRequiredToCancelHealthInsuranceContract_D328EFEFBE1D5C9D3BAB270EA4C352D3" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_unh_NumberOfDaysNoticeRequiredToCancelHealthInsuranceContract_D328EFEFBE1D5C9D3BAB270EA4C352D3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_78950A57A81AA234E65C270EA4C3EBED" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_78950A57A81AA234E65C270EA4C3EBED" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SharebasedCompensationArrangementbySharebasedPaymentPlanAwardOptionsAwardExercisablePeriod" xlink:label="loc_unh_SharebasedCompensationArrangementbySharebasedPaymentPlanAwardOptionsAwardExercisablePeriod_5CD67C23C0D37C66AFEE270EA4C3F8EF" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_unh_SharebasedCompensationArrangementbySharebasedPaymentPlanAwardOptionsAwardExercisablePeriod_5CD67C23C0D37C66AFEE270EA4C3F8EF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_743342F98509094CBC49270EA4C3B1E2" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_743342F98509094CBC49270EA4C3B1E2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_A67F27918067ABB92CF0270EA4C3A935" xlink:type="locator"/>
<definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_A67F27918067ABB92CF0270EA4C3A935" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_C1336B365275370EC0F2270EA4C38D4D" xlink:type="locator"/>
<definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3EFD4C282862870CA41270EA4BC5DCC" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_C1336B365275370EC0F2270EA4C38D4D" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/BasisOfPresentationUseOfEstimatesAndSignificantAccountingPoliciesPolicy" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/CommercialPaperAndLongTermDebt" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/CommercialPaperAndLongTermDebtBalanceSheetLocationOfFairValueDerivativesDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_B0E4625961F2FE6784FE5CD9E27E4864" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0CE861571B63C3C586165CD9E27DDC97" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_B0E4625961F2FE6784FE5CD9E27E4864" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0CE861571B63C3C586165CD9E27DDC97" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeByNatureAxis" xlink:label="loc_us-gaap_DerivativeByNatureAxis_E9CF43884EB9DEBEC0915CD9E27D7D90" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0CE861571B63C3C586165CD9E27DDC97" xlink:to="loc_us-gaap_DerivativeByNatureAxis_E9CF43884EB9DEBEC0915CD9E27D7D90" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="loc_us-gaap_DerivativeNameDomain_E36F4C176DDBF2D6069E5CD9E27DB1F0_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeByNatureAxis_E9CF43884EB9DEBEC0915CD9E27D7D90" xlink:to="loc_us-gaap_DerivativeNameDomain_E36F4C176DDBF2D6069E5CD9E27DB1F0_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="loc_us-gaap_DerivativeNameDomain_E36F4C176DDBF2D6069E5CD9E27DB1F0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeByNatureAxis_E9CF43884EB9DEBEC0915CD9E27D7D90" xlink:to="loc_us-gaap_DerivativeNameDomain_E36F4C176DDBF2D6069E5CD9E27DB1F0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_31906C3A6A283230345E5CD9E27EB8DD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeNameDomain_E36F4C176DDBF2D6069E5CD9E27DB1F0" xlink:to="loc_us-gaap_InterestRateSwapMember_31906C3A6A283230345E5CD9E27EB8DD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_87AB159BDEE192BF49C75CD9E27E9C39" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0CE861571B63C3C586165CD9E27DDC97" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_87AB159BDEE192BF49C75CD9E27E9C39" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_C52F619AD8F87F84403E5CD9E27EF0B8_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_87AB159BDEE192BF49C75CD9E27E9C39" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_C52F619AD8F87F84403E5CD9E27EF0B8_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_C52F619AD8F87F84403E5CD9E27EF0B8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_87AB159BDEE192BF49C75CD9E27E9C39" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_C52F619AD8F87F84403E5CD9E27EF0B8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesMember" xlink:label="loc_us-gaap_OtherLiabilitiesMember_E6F43B54BCF5DA3D44B35CD9E27E1EC0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_C52F619AD8F87F84403E5CD9E27EF0B8" xlink:to="loc_us-gaap_OtherLiabilitiesMember_E6F43B54BCF5DA3D44B35CD9E27E1EC0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsMember" xlink:label="loc_us-gaap_OtherAssetsMember_729A4CF670045B332F9C5CD9E27EFD18" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_C52F619AD8F87F84403E5CD9E27EF0B8" xlink:to="loc_us-gaap_OtherAssetsMember_729A4CF670045B332F9C5CD9E27EFD18" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PositionAxis" xlink:label="loc_us-gaap_PositionAxis_7CAC850D156E30FEF0C65CD9E27E6F14" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0CE861571B63C3C586165CD9E27DDC97" xlink:to="loc_us-gaap_PositionAxis_7CAC850D156E30FEF0C65CD9E27E6F14" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PositionDomain" xlink:label="loc_us-gaap_PositionDomain_49DC9BA4670ECE23469F5CD9E27ED034_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PositionAxis_7CAC850D156E30FEF0C65CD9E27E6F14" xlink:to="loc_us-gaap_PositionDomain_49DC9BA4670ECE23469F5CD9E27ED034_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PositionDomain" xlink:label="loc_us-gaap_PositionDomain_49DC9BA4670ECE23469F5CD9E27ED034" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PositionAxis_7CAC850D156E30FEF0C65CD9E27E6F14" xlink:to="loc_us-gaap_PositionDomain_49DC9BA4670ECE23469F5CD9E27ED034" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateDerivativeLiabilitiesAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeLiabilitiesAtFairValue_DEBF7AF0634DE6DA35495CD9E27E4E4E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_B0E4625961F2FE6784FE5CD9E27E4864" xlink:to="loc_us-gaap_InterestRateDerivativeLiabilitiesAtFairValue_DEBF7AF0634DE6DA35495CD9E27E4E4E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_DerivativeNotionalAmount" xlink:label="loc_invest_DerivativeNotionalAmount_19BFD6C5B5B1870680BC5CD9E27E62C6" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_B0E4625961F2FE6784FE5CD9E27E4864" xlink:to="loc_invest_DerivativeNotionalAmount_19BFD6C5B5B1870680BC5CD9E27E62C6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateDerivativeAssetsAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_8E26E33950D9DB46C7025CD9E27F96A8" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_B0E4625961F2FE6784FE5CD9E27E4864" xlink:to="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_8E26E33950D9DB46C7025CD9E27F96A8" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/CommercialPaperAndLongTermDebtDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_F4B114EA6306AB91D5F65CD9E2F09F16" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_E6ADE2C85E41CF03273F5CD9E2EB01E0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_F4B114EA6306AB91D5F65CD9E2F09F16" xlink:to="loc_us-gaap_DebtInstrumentTable_E6ADE2C85E41CF03273F5CD9E2EB01E0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_9DCAB6563E0BAD045DEA5CD9E2EB206B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_E6ADE2C85E41CF03273F5CD9E2EB01E0" xlink:to="loc_us-gaap_VariableRateAxis_9DCAB6563E0BAD045DEA5CD9E2EB206B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_42016858122F803860DB5CD9E2EB88D1_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_9DCAB6563E0BAD045DEA5CD9E2EB206B" xlink:to="loc_us-gaap_VariableRateDomain_42016858122F803860DB5CD9E2EB88D1_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_42016858122F803860DB5CD9E2EB88D1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_9DCAB6563E0BAD045DEA5CD9E2EB206B" xlink:to="loc_us-gaap_VariableRateDomain_42016858122F803860DB5CD9E2EB88D1" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CdiAnd1300Member" xlink:label="loc_unh_CdiAnd1300Member_C8443EBF2C72525E7AE55CD9E2EBC5A5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_42016858122F803860DB5CD9E2EB88D1" xlink:to="loc_unh_CdiAnd1300Member_C8443EBF2C72525E7AE55CD9E2EBC5A5" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CdiAnd1450Member" xlink:label="loc_unh_CdiAnd1450Member_B7318EF7EED9608D4F155CD9E2EBAAFA" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_42016858122F803860DB5CD9E2EB88D1" xlink:to="loc_unh_CdiAnd1450Member_B7318EF7EED9608D4F155CD9E2EBAAFA" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A110CdiMember" xlink:label="loc_unh_A110CdiMember_12657DBB53281993140F5CD9E2ECF16B" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_42016858122F803860DB5CD9E2EB88D1" xlink:to="loc_unh_A110CdiMember_12657DBB53281993140F5CD9E2ECF16B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CdiAnd1600Member" xlink:label="loc_unh_CdiAnd1600Member_8A6D4FFD0E2A3D1F3CE65CD9E2EC8D3D" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_42016858122F803860DB5CD9E2EB88D1" xlink:to="loc_unh_CdiAnd1600Member_8A6D4FFD0E2A3D1F3CE65CD9E2EC8D3D" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_IcpaAnd7610Member" xlink:label="loc_unh_IcpaAnd7610Member_14362AA9BA4ACBFAF7095CD9E2EC3FB9" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_42016858122F803860DB5CD9E2EB88D1" xlink:to="loc_unh_IcpaAnd7610Member_14362AA9BA4ACBFAF7095CD9E2EC3FB9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_49DE8A13E42E936823FD5CD9E2ECFA6A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_E6ADE2C85E41CF03273F5CD9E2EB01E0" xlink:to="loc_us-gaap_DebtInstrumentAxis_49DE8A13E42E936823FD5CD9E2ECFA6A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_49DE8A13E42E936823FD5CD9E2ECFA6A" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_49DE8A13E42E936823FD5CD9E2ECFA6A" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="loc_us-gaap_CommercialPaperMember_7EAEE75823475E0C453F5CD9E2EC7EF7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_us-gaap_CommercialPaperMember_7EAEE75823475E0C453F5CD9E2EC7EF7" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FourPointEightSevenFiveSeniorUnsecuredNotesDueFebrurary2013Member" xlink:label="loc_unh_FourPointEightSevenFiveSeniorUnsecuredNotesDueFebrurary2013Member_AB3572CAAFFA93A436425CD9E2EC302B" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FourPointEightSevenFiveSeniorUnsecuredNotesDueFebrurary2013Member_AB3572CAAFFA93A436425CD9E2EC302B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FourPointEightSevenFivePercentSeniorUnsecuredNotesDueApril2013Member" xlink:label="loc_unh_FourPointEightSevenFivePercentSeniorUnsecuredNotesDueApril2013Member_8A1D5523CB65D001D5F45CD9E2ECCE86" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FourPointEightSevenFivePercentSeniorUnsecuredNotesDueApril2013Member_8A1D5523CB65D001D5F45CD9E2ECCE86" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FourPointSevenFiveSeniorUnsecuredNotesDueFebruray2014Member" xlink:label="loc_unh_FourPointSevenFiveSeniorUnsecuredNotesDueFebruray2014Member_F017DDB1AAB1142A0CE15CD9E2EC0710" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FourPointSevenFiveSeniorUnsecuredNotesDueFebruray2014Member_F017DDB1AAB1142A0CE15CD9E2EC0710" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FivePercentSeniorUnsecuredNotesDueAugust2014Member" xlink:label="loc_unh_FivePercentSeniorUnsecuredNotesDueAugust2014Member_1026A749856DEC470F7D5CD9E2ED7383" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FivePercentSeniorUnsecuredNotesDueAugust2014Member_1026A749856DEC470F7D5CD9E2ED7383" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SeniorUnsecuredFloatingRateNotesDueAugust2014Member" xlink:label="loc_unh_SeniorUnsecuredFloatingRateNotesDueAugust2014Member_45A4E2624E15396051765CD9E2EDADB9" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_SeniorUnsecuredFloatingRateNotesDueAugust2014Member_45A4E2624E15396051765CD9E2EDADB9" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FourPointEightSevenFivePercentSeniorUnsecuredNotesDueMarch2015Member" xlink:label="loc_unh_FourPointEightSevenFivePercentSeniorUnsecuredNotesDueMarch2015Member_6D29C134A7AA9C09E5285CD9E2ED93E0" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FourPointEightSevenFivePercentSeniorUnsecuredNotesDueMarch2015Member_6D29C134A7AA9C09E5285CD9E2ED93E0" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A0850SeniorUnsecuredNotesDueOctober2015Member" xlink:label="loc_unh_A0850SeniorUnsecuredNotesDueOctober2015Member_6397A783723236EE3C745CD9E2ED8BEC" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_A0850SeniorUnsecuredNotesDueOctober2015Member_6397A783723236EE3C745CD9E2ED8BEC" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FivePointThreeSevenFivePercentSeniorUnsecuredNotesDueMarch2016Member" xlink:label="loc_unh_FivePointThreeSevenFivePercentSeniorUnsecuredNotesDueMarch2016Member_F00C048D02B217E480DF5CD9E2ED2649" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FivePointThreeSevenFivePercentSeniorUnsecuredNotesDueMarch2016Member_F00C048D02B217E480DF5CD9E2ED2649" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_OnePointEightSevenFivePercentSeniorUnsecuredNotesDueNovember2016Member" xlink:label="loc_unh_OnePointEightSevenFivePercentSeniorUnsecuredNotesDueNovember2016Member_78A791DEF80983AC4AFE5CD9E2ED123D" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_OnePointEightSevenFivePercentSeniorUnsecuredNotesDueNovember2016Member_78A791DEF80983AC4AFE5CD9E2ED123D" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FivePointThreeSixPercentSeniorUnsecuredNotesDueNovember2016Member" xlink:label="loc_unh_FivePointThreeSixPercentSeniorUnsecuredNotesDueNovember2016Member_9AECDCC9909C2386DCB95CD9E2ED39A9" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FivePointThreeSixPercentSeniorUnsecuredNotesDueNovember2016Member_9AECDCC9909C2386DCB95CD9E2ED39A9" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SixPercentSeniorUnsecuredNotesDueJuneTwoThousandSeventeenMember" xlink:label="loc_unh_SixPercentSeniorUnsecuredNotesDueJuneTwoThousandSeventeenMember_755D8FD5380F10D293B05CD9E2ED5178" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_SixPercentSeniorUnsecuredNotesDueJuneTwoThousandSeventeenMember_755D8FD5380F10D293B05CD9E2ED5178" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A1400SeniorUnsecuredNotesDueOctober2017Member" xlink:label="loc_unh_A1400SeniorUnsecuredNotesDueOctober2017Member_DE21AD8D2B243831804F5CD9E2EDD081" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_A1400SeniorUnsecuredNotesDueOctober2017Member_DE21AD8D2B243831804F5CD9E2EDD081" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SixPointZeroPercentSeniorUnsecuredNotesDueNovember2017Member" xlink:label="loc_unh_SixPointZeroPercentSeniorUnsecuredNotesDueNovember2017Member_63E5219399DFB21BB7695CD9E2EDD829" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_SixPointZeroPercentSeniorUnsecuredNotesDueNovember2017Member_63E5219399DFB21BB7695CD9E2EDD829" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SixPointZeroSeniorUnsecuredNotesDueFebruaryTwoThousandEighteenMember" xlink:label="loc_unh_SixPointZeroSeniorUnsecuredNotesDueFebruaryTwoThousandEighteenMember_F7ABE4C88FEB1100D51C5CD9E2ED663A" xlink:type="locator"/>
<definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_SixPointZeroSeniorUnsecuredNotesDueFebruaryTwoThousandEighteenMember_F7ABE4C88FEB1100D51C5CD9E2ED663A" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A1625SeniorUnsecuredNotesDueMarch2019Member" xlink:label="loc_unh_A1625SeniorUnsecuredNotesDueMarch2019Member_39E1707EDA5FDD3EF4605CD9E2EDE78C" xlink:type="locator"/>
<definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_A1625SeniorUnsecuredNotesDueMarch2019Member_39E1707EDA5FDD3EF4605CD9E2EDE78C" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ThreePointEightSevenFivePercentSeniorUnsecuredNotesDueOctober2020Member" xlink:label="loc_unh_ThreePointEightSevenFivePercentSeniorUnsecuredNotesDueOctober2020Member_F26D2ED755E399D789FB5CD9E2EDC1B5" xlink:type="locator"/>
<definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_ThreePointEightSevenFivePercentSeniorUnsecuredNotesDueOctober2020Member_F26D2ED755E399D789FB5CD9E2EDC1B5" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FourPointSevenPercentageSeniorUnsecuredNotesDueFebruaryTwoThousandTwentyOneMember" xlink:label="loc_unh_FourPointSevenPercentageSeniorUnsecuredNotesDueFebruaryTwoThousandTwentyOneMember_F3D7DA9FF4A520690E705CD9E2EEFC9E" xlink:type="locator"/>
<definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FourPointSevenPercentageSeniorUnsecuredNotesDueFebruaryTwoThousandTwentyOneMember_F3D7DA9FF4A520690E705CD9E2EEFC9E" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ThreePointThreeSevenFivePercentSeniorUnsecuredNotesDueNovember2021Member" xlink:label="loc_unh_ThreePointThreeSevenFivePercentSeniorUnsecuredNotesDueNovember2021Member_CC5D089B1020FCB6AC0B5CD9E2EEC2C1" xlink:type="locator"/>
<definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_ThreePointThreeSevenFivePercentSeniorUnsecuredNotesDueNovember2021Member_CC5D089B1020FCB6AC0B5CD9E2EEC2C1" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TwoPointEightSevenFiveSeniorUnsecuredNotesDueMarch2022Member" xlink:label="loc_unh_TwoPointEightSevenFiveSeniorUnsecuredNotesDueMarch2022Member_94E48898F888DB5732AE5CD9E2EE6EE0" xlink:type="locator"/>
<definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_TwoPointEightSevenFiveSeniorUnsecuredNotesDueMarch2022Member_94E48898F888DB5732AE5CD9E2EE6EE0" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ZeroCouponSeniorUnsecuredNotesDueNovemberTwoThousandTwentyTwoMember" xlink:label="loc_unh_ZeroCouponSeniorUnsecuredNotesDueNovemberTwoThousandTwentyTwoMember_58A1B26D6C2A18C6F25A5CD9E2EE6765" xlink:type="locator"/>
<definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_ZeroCouponSeniorUnsecuredNotesDueNovemberTwoThousandTwentyTwoMember_58A1B26D6C2A18C6F25A5CD9E2EE6765" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A2750SeniorUnsecuredNotesDueFebruary2023Member" xlink:label="loc_unh_A2750SeniorUnsecuredNotesDueFebruary2023Member_5F4CB183E7250004B54E5CD9E2EE2218" xlink:type="locator"/>
<definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_A2750SeniorUnsecuredNotesDueFebruary2023Member_5F4CB183E7250004B54E5CD9E2EE2218" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A2875SeniorUnsecuredNotesDueMarch2023Member" xlink:label="loc_unh_A2875SeniorUnsecuredNotesDueMarch2023Member_9B1D49FE772EFE84BD625CD9E2EEA2BD" xlink:type="locator"/>
<definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_A2875SeniorUnsecuredNotesDueMarch2023Member_9B1D49FE772EFE84BD625CD9E2EEA2BD" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FivePointEightPercentSeniorUnsecuredNotesDueMarchTwoThousandThirtySixMember" xlink:label="loc_unh_FivePointEightPercentSeniorUnsecuredNotesDueMarchTwoThousandThirtySixMember_F464373A87D2DD646D925CD9E2EE2A44" xlink:type="locator"/>
<definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FivePointEightPercentSeniorUnsecuredNotesDueMarchTwoThousandThirtySixMember_F464373A87D2DD646D925CD9E2EE2A44" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SixPointFivePercentSeniorUnsecuredNotesDueJuneTwoThousandThirtySevenMember" xlink:label="loc_unh_SixPointFivePercentSeniorUnsecuredNotesDueJuneTwoThousandThirtySevenMember_7C98DEA609B9DF1F22745CD9E2EE89B5" xlink:type="locator"/>
<definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_SixPointFivePercentSeniorUnsecuredNotesDueJuneTwoThousandThirtySevenMember_7C98DEA609B9DF1F22745CD9E2EE89B5" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SixPointSixTwoFivePercentSeniorUnsecuredNotesDueNovember2037Member" xlink:label="loc_unh_SixPointSixTwoFivePercentSeniorUnsecuredNotesDueNovember2037Member_403CA589A0F01D021EC75CD9E2EE6ABA" xlink:type="locator"/>
<definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_SixPointSixTwoFivePercentSeniorUnsecuredNotesDueNovember2037Member_403CA589A0F01D021EC75CD9E2EE6ABA" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SixPointEightSevenFivePercentSeniorUnsecuredNotesDueFebruray2038Member" xlink:label="loc_unh_SixPointEightSevenFivePercentSeniorUnsecuredNotesDueFebruray2038Member_0EA7C220828D5F9DAB5C5CD9E2EE950C" xlink:type="locator"/>
<definitionArc order="27" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_SixPointEightSevenFivePercentSeniorUnsecuredNotesDueFebruray2038Member_0EA7C220828D5F9DAB5C5CD9E2EE950C" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FivePointSevenPercentSeniorUnsecuredNotesDueOctoberTwoThousandFortyMember" xlink:label="loc_unh_FivePointSevenPercentSeniorUnsecuredNotesDueOctoberTwoThousandFortyMember_1E20FFE0B052AE6FE9BA5CD9E2EE801B" xlink:type="locator"/>
<definitionArc order="28" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FivePointSevenPercentSeniorUnsecuredNotesDueOctoberTwoThousandFortyMember_1E20FFE0B052AE6FE9BA5CD9E2EE801B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FivePointNineFiveSeniorUnsecuredNotesDueFebrurary2041Member" xlink:label="loc_unh_FivePointNineFiveSeniorUnsecuredNotesDueFebrurary2041Member_5ACC486071044A142B235CD9E2EF0A58" xlink:type="locator"/>
<definitionArc order="29" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FivePointNineFiveSeniorUnsecuredNotesDueFebrurary2041Member_5ACC486071044A142B235CD9E2EF0A58" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FourPointSixTwoFivePercentSeniorUnsecuredNotesDueNovember2041Member" xlink:label="loc_unh_FourPointSixTwoFivePercentSeniorUnsecuredNotesDueNovember2041Member_7845EA8052AFF7656DBA5CD9E2EF2898" xlink:type="locator"/>
<definitionArc order="30" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FourPointSixTwoFivePercentSeniorUnsecuredNotesDueNovember2041Member_7845EA8052AFF7656DBA5CD9E2EF2898" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FourPointThreeSevenFivePercentSeniorUnsecuredNotesDueMarch2042Member" xlink:label="loc_unh_FourPointThreeSevenFivePercentSeniorUnsecuredNotesDueMarch2042Member_CF6428C7FD3E02B780B05CD9E2EFB730" xlink:type="locator"/>
<definitionArc order="31" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_FourPointThreeSevenFivePercentSeniorUnsecuredNotesDueMarch2042Member_CF6428C7FD3E02B780B05CD9E2EFB730" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A3950SeniorUnsecuredNotesDueOctober2042Member" xlink:label="loc_unh_A3950SeniorUnsecuredNotesDueOctober2042Member_A1C3E7673A99EA7534415CD9E2EF742B" xlink:type="locator"/>
<definitionArc order="32" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_A3950SeniorUnsecuredNotesDueOctober2042Member_A1C3E7673A99EA7534415CD9E2EF742B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A4250SeniorUnsecuredNotesDueMarch2043Member" xlink:label="loc_unh_A4250SeniorUnsecuredNotesDueMarch2043Member_71D1292C3B1E424D26735CD9E2EF7029" xlink:type="locator"/>
<definitionArc order="33" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_A4250SeniorUnsecuredNotesDueMarch2043Member_71D1292C3B1E424D26735CD9E2EF7029" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DomesticCorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_DomesticCorporateDebtSecuritiesMember_1CA604C648CD00DF6FC25CD9E2EFB949" xlink:type="locator"/>
<definitionArc order="34" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_us-gaap_DomesticCorporateDebtSecuritiesMember_1CA604C648CD00DF6FC25CD9E2EFB949" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CdiAnd13SubsidiaryFloatingDebtDueOctober2013Member" xlink:label="loc_unh_CdiAnd13SubsidiaryFloatingDebtDueOctober2013Member_3A691F513F8D6AF605855CD9E2EFB3E8" xlink:type="locator"/>
<definitionArc order="35" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_CdiAnd13SubsidiaryFloatingDebtDueOctober2013Member_3A691F513F8D6AF605855CD9E2EFB3E8" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CdiAnd145SubsidiaryFloatingDebtDueOctober2014Member" xlink:label="loc_unh_CdiAnd145SubsidiaryFloatingDebtDueOctober2014Member_3E5B13000F9AB594A2C65CD9E2EFEA2F" xlink:type="locator"/>
<definitionArc order="36" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_CdiAnd145SubsidiaryFloatingDebtDueOctober2014Member_3E5B13000F9AB594A2C65CD9E2EFEA2F" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A110CdiSubsidiaryFloatingDebtDueDecember2014Member" xlink:label="loc_unh_A110CdiSubsidiaryFloatingDebtDueDecember2014Member_6C8BD125BC707D247E9E5CD9E2EF6EE7" xlink:type="locator"/>
<definitionArc order="37" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_A110CdiSubsidiaryFloatingDebtDueDecember2014Member_6C8BD125BC707D247E9E5CD9E2EF6EE7" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CdiAnd16SubsidiaryFloatingDebtDueOctober2015Member" xlink:label="loc_unh_CdiAnd16SubsidiaryFloatingDebtDueOctober2015Member_8C5AE62CFAC69184CB5D5CD9E2EF3F0A" xlink:type="locator"/>
<definitionArc order="38" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_CdiAnd16SubsidiaryFloatingDebtDueOctober2015Member_8C5AE62CFAC69184CB5D5CD9E2EF3F0A" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_IpcaAnd761SubsidiaryFloatingDebtDueOctober2015Member" xlink:label="loc_unh_IpcaAnd761SubsidiaryFloatingDebtDueOctober2015Member_F3FAF76B96918F5840C65CD9E2EF0789" xlink:type="locator"/>
<definitionArc order="39" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_unh_IpcaAnd761SubsidiaryFloatingDebtDueOctober2015Member_F3FAF76B96918F5840C65CD9E2EF0789" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_ForeignCorporateDebtSecuritiesMember_0DE7469BE24CDD4525F35CD9E2F0C180" xlink:type="locator"/>
<definitionArc order="40" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6D72C02AF18551D161E25CD9E2EC54FF" xlink:to="loc_us-gaap_ForeignCorporateDebtSecuritiesMember_0DE7469BE24CDD4525F35CD9E2F0C180" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_2142953B90B7B23ABB115CD9E2F089DC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F4B114EA6306AB91D5F65CD9E2F09F16" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_2142953B90B7B23ABB115CD9E2F089DC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_56A35E30706C9470A4575CD9E2F06412" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F4B114EA6306AB91D5F65CD9E2F09F16" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_56A35E30706C9470A4575CD9E2F06412" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommercialPaper" xlink:label="loc_us-gaap_CommercialPaper_E1FC4E364E0EE8983D865CD9E2F0B51D" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F4B114EA6306AB91D5F65CD9E2F09F16" xlink:to="loc_us-gaap_CommercialPaper_E1FC4E364E0EE8983D865CD9E2F0B51D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_83D7F8CCE37CE94A12F85CD9E2F044B8" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F4B114EA6306AB91D5F65CD9E2F09F16" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_83D7F8CCE37CE94A12F85CD9E2F044B8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentFairValue" xlink:label="loc_us-gaap_DebtInstrumentFairValue_F420AAEC3FD1011790685CD9E2F09CEE" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F4B114EA6306AB91D5F65CD9E2F09F16" xlink:to="loc_us-gaap_DebtInstrumentFairValue_F420AAEC3FD1011790685CD9E2F09CEE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaap_LongTermDebtFairValue_D2D12D02EB254363B38B5CD9E2F05768" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F4B114EA6306AB91D5F65CD9E2F09F16" xlink:to="loc_us-gaap_LongTermDebtFairValue_D2D12D02EB254363B38B5CD9E2F05768" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/CommercialPaperAndLongTermDebtIncomeStatementRecognitionOfFairValueHedgeDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_34A22063D1AADEDFD079FEA7B55CFE54" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3E6BCE50F45B8047BE97FEA7B55B9EFC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_34A22063D1AADEDFD079FEA7B55CFE54" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3E6BCE50F45B8047BE97FEA7B55B9EFC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="unh-20131231.xsd#unh_HedgedItemAxis" xlink:label="loc_unh_HedgedItemAxis_6F76B52DD28071E18F35FEA7B55B71E1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3E6BCE50F45B8047BE97FEA7B55B9EFC" xlink:to="loc_unh_HedgedItemAxis_6F76B52DD28071E18F35FEA7B55B71E1" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_HedgedItemDomain" xlink:label="loc_unh_HedgedItemDomain_2C9A39B01AFBE074AAC4FEA7B55BB3C7_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_HedgedItemAxis_6F76B52DD28071E18F35FEA7B55B71E1" xlink:to="loc_unh_HedgedItemDomain_2C9A39B01AFBE074AAC4FEA7B55BB3C7_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_HedgedItemDomain" xlink:label="loc_unh_HedgedItemDomain_2C9A39B01AFBE074AAC4FEA7B55BB3C7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_HedgedItemAxis_6F76B52DD28071E18F35FEA7B55B71E1" xlink:to="loc_unh_HedgedItemDomain_2C9A39B01AFBE074AAC4FEA7B55BB3C7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtMember" xlink:label="loc_us-gaap_DebtMember_D893957AA5B0B7766769FEA7B55B450C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_HedgedItemDomain_2C9A39B01AFBE074AAC4FEA7B55BB3C7" xlink:to="loc_us-gaap_DebtMember_D893957AA5B0B7766769FEA7B55B450C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeByNatureAxis" xlink:label="loc_us-gaap_DerivativeByNatureAxis_F7B75B0A3811580E2F4BFEA7B55CA210" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3E6BCE50F45B8047BE97FEA7B55B9EFC" xlink:to="loc_us-gaap_DerivativeByNatureAxis_F7B75B0A3811580E2F4BFEA7B55CA210" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="loc_us-gaap_DerivativeNameDomain_86A6CB56153F0655501AFEA7B55CAD5E_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeByNatureAxis_F7B75B0A3811580E2F4BFEA7B55CA210" xlink:to="loc_us-gaap_DerivativeNameDomain_86A6CB56153F0655501AFEA7B55CAD5E_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="loc_us-gaap_DerivativeNameDomain_86A6CB56153F0655501AFEA7B55CAD5E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeByNatureAxis_F7B75B0A3811580E2F4BFEA7B55CA210" xlink:to="loc_us-gaap_DerivativeNameDomain_86A6CB56153F0655501AFEA7B55CAD5E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_92AB85303ABEF77D2EDDFEA7B55C7AF4" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeNameDomain_86A6CB56153F0655501AFEA7B55CAD5E" xlink:to="loc_us-gaap_InterestRateSwapMember_92AB85303ABEF77D2EDDFEA7B55C7AF4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_0C26A1C03892FF9BA89CFEA7B55CC709" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3E6BCE50F45B8047BE97FEA7B55B9EFC" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_0C26A1C03892FF9BA89CFEA7B55CC709" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_DB1640D6F62E0303B371FEA7B55C4A76_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_0C26A1C03892FF9BA89CFEA7B55CC709" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_DB1640D6F62E0303B371FEA7B55C4A76_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_DB1640D6F62E0303B371FEA7B55C4A76" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_0C26A1C03892FF9BA89CFEA7B55CC709" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_DB1640D6F62E0303B371FEA7B55C4A76" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_4E63E968BD5F5778F89CFEA7B55C487B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_DB1640D6F62E0303B371FEA7B55C4A76" xlink:to="loc_us-gaap_InterestRateSwapMember_4E63E968BD5F5778F89CFEA7B55C487B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_6F3D6684EF4FE950EF6FFEA7B55C8647" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3E6BCE50F45B8047BE97FEA7B55B9EFC" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_6F3D6684EF4FE950EF6FFEA7B55C8647" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_566F77D99799436E74E6FEA7B55C73DA_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_6F3D6684EF4FE950EF6FFEA7B55C8647" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_566F77D99799436E74E6FEA7B55C73DA_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_566F77D99799436E74E6FEA7B55C73DA" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_6F3D6684EF4FE950EF6FFEA7B55C8647" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_566F77D99799436E74E6FEA7B55C73DA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestExpenseMember" xlink:label="loc_us-gaap_InterestExpenseMember_1422A6B3F7B2C3E19C14FEA7B55CA82A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_566F77D99799436E74E6FEA7B55C73DA" xlink:to="loc_us-gaap_InterestExpenseMember_1422A6B3F7B2C3E19C14FEA7B55CA82A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeGainOnDerivative" xlink:label="loc_us-gaap_DerivativeGainOnDerivative_6DAC1C80F5EBBAAF0DB4FEA7B55CA345" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_34A22063D1AADEDFD079FEA7B55CFE54" xlink:to="loc_us-gaap_DerivativeGainOnDerivative_6DAC1C80F5EBBAAF0DB4FEA7B55CA345" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeLossOnDerivative" xlink:label="loc_us-gaap_DerivativeLossOnDerivative_3278FE9AD477BD615568FEA7B55CBF16" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_34A22063D1AADEDFD079FEA7B55CFE54" xlink:to="loc_us-gaap_DerivativeLossOnDerivative_3278FE9AD477BD615568FEA7B55CBF16" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_09BEE79B437BA9EA79AEFEA7B55DA9C0" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_34A22063D1AADEDFD079FEA7B55CFE54" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_09BEE79B437BA9EA79AEFEA7B55DA9C0" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/CommercialPaperAndLongTermDebtMaturitiesOfCommercialPaperAndLongTermDebtDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_BAE2C92F22883DD7CDF70297A895306F" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_8461C4F3ADABF78A92F90297A8939C4E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BAE2C92F22883DD7CDF70297A895306F" xlink:to="loc_us-gaap_DebtInstrumentTable_8461C4F3ADABF78A92F90297A8939C4E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_208B1CEB9CD695B034010297A893AD30" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8461C4F3ADABF78A92F90297A8939C4E" xlink:to="loc_dei_LegalEntityAxis_208B1CEB9CD695B034010297A893AD30" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_A21EABC7AF498EA8333F0297A89363A1_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_208B1CEB9CD695B034010297A893AD30" xlink:to="loc_dei_EntityDomain_A21EABC7AF498EA8333F0297A89363A1_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_A21EABC7AF498EA8333F0297A89363A1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_208B1CEB9CD695B034010297A893AD30" xlink:to="loc_dei_EntityDomain_A21EABC7AF498EA8333F0297A89363A1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_E5E6B61909739C9ED8800297A8948BC1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_A21EABC7AF498EA8333F0297A89363A1" xlink:to="loc_us-gaap_ParentMember_E5E6B61909739C9ED8800297A8948BC1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_42393A90955F9CB8F41A0297A8944778" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8461C4F3ADABF78A92F90297A8939C4E" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_42393A90955F9CB8F41A0297A8944778" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_E7455EE27162FEC786630297A89458E2_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_42393A90955F9CB8F41A0297A8944778" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_E7455EE27162FEC786630297A89458E2_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_E7455EE27162FEC786630297A89458E2" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_42393A90955F9CB8F41A0297A8944778" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_E7455EE27162FEC786630297A89458E2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_8FD994DC9756F3C6653C0297A89467E1" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8461C4F3ADABF78A92F90297A8939C4E" xlink:to="loc_us-gaap_DebtInstrumentAxis_8FD994DC9756F3C6653C0297A89467E1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B71FACF1A1CF94555EAE0297A8947831_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_8FD994DC9756F3C6653C0297A89467E1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B71FACF1A1CF94555EAE0297A8947831_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B71FACF1A1CF94555EAE0297A8947831" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_8FD994DC9756F3C6653C0297A89467E1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B71FACF1A1CF94555EAE0297A8947831" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_D2076888591FA5CE01C50297A894DE80" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8461C4F3ADABF78A92F90297A8939C4E" xlink:to="loc_us-gaap_VariableRateAxis_D2076888591FA5CE01C50297A894DE80" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_04D37BDF4A1BEAB6A0CD0297A8942F24_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_D2076888591FA5CE01C50297A894DE80" xlink:to="loc_us-gaap_VariableRateDomain_04D37BDF4A1BEAB6A0CD0297A8942F24_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_04D37BDF4A1BEAB6A0CD0297A8942F24" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_D2076888591FA5CE01C50297A894DE80" xlink:to="loc_us-gaap_VariableRateDomain_04D37BDF4A1BEAB6A0CD0297A8942F24" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_648C2849E78D0B62A3E10297A894972B" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8461C4F3ADABF78A92F90297A8939C4E" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_648C2849E78D0B62A3E10297A894972B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_D8EE2C500A7E81107C8A0297A89453C0_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_648C2849E78D0B62A3E10297A894972B" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_D8EE2C500A7E81107C8A0297A89453C0_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_D8EE2C500A7E81107C8A0297A89453C0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_648C2849E78D0B62A3E10297A894972B" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_D8EE2C500A7E81107C8A0297A89453C0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_CD519681538452EFAE3A0297A895B48B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BAE2C92F22883DD7CDF70297A895306F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_CD519681538452EFAE3A0297A895B48B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_4B4EF8DB2D6E4A2944E30297A8959C37" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BAE2C92F22883DD7CDF70297A895306F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_4B4EF8DB2D6E4A2944E30297A8959C37" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_7F456C660A8C3B72E4D50297A89593CB" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BAE2C92F22883DD7CDF70297A895306F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_7F456C660A8C3B72E4D50297A89593CB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_633857DE1511379F13100297A89599C6" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BAE2C92F22883DD7CDF70297A895306F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_633857DE1511379F13100297A89599C6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_416D019B672B1D6E4CD10297A895298B" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BAE2C92F22883DD7CDF70297A895306F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_416D019B672B1D6E4CD10297A895298B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_C71989C4B314BF389EF602A03DAC0396" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BAE2C92F22883DD7CDF70297A895306F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_C71989C4B314BF389EF602A03DAC0396" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/CommercialPaperAndLongTermDebtNarrativeDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_F4C0B941A43AD99301C4080AB195CD4E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_us-gaap_DebtInstrumentTable_F4C0B941A43AD99301C4080AB195CD4E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeByNatureAxis" xlink:label="loc_us-gaap_DerivativeByNatureAxis_C658492E78E8BC18F00B080AB19B0255" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_F4C0B941A43AD99301C4080AB195CD4E" xlink:to="loc_us-gaap_DerivativeByNatureAxis_C658492E78E8BC18F00B080AB19B0255" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="loc_us-gaap_DerivativeNameDomain_4E8E407F957FF949A8F5080AB19B5DA8_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeByNatureAxis_C658492E78E8BC18F00B080AB19B0255" xlink:to="loc_us-gaap_DerivativeNameDomain_4E8E407F957FF949A8F5080AB19B5DA8_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="loc_us-gaap_DerivativeNameDomain_4E8E407F957FF949A8F5080AB19B5DA8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeByNatureAxis_C658492E78E8BC18F00B080AB19B0255" xlink:to="loc_us-gaap_DerivativeNameDomain_4E8E407F957FF949A8F5080AB19B5DA8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_749880F531E69553F39F080AB19C5164" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeNameDomain_4E8E407F957FF949A8F5080AB19B5DA8" xlink:to="loc_us-gaap_InterestRateSwapMember_749880F531E69553F39F080AB19C5164" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CreditFacilityNameAxis" xlink:label="loc_unh_CreditFacilityNameAxis_86D87D41AB9C73B1A2EA080AB19C8CC3" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_F4C0B941A43AD99301C4080AB195CD4E" xlink:to="loc_unh_CreditFacilityNameAxis_86D87D41AB9C73B1A2EA080AB19C8CC3" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CreditFacilityNameDomain" xlink:label="loc_unh_CreditFacilityNameDomain_0D493204B41167DFD70D080AB19C9586_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_CreditFacilityNameAxis_86D87D41AB9C73B1A2EA080AB19C8CC3" xlink:to="loc_unh_CreditFacilityNameDomain_0D493204B41167DFD70D080AB19C9586_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CreditFacilityNameDomain" xlink:label="loc_unh_CreditFacilityNameDomain_0D493204B41167DFD70D080AB19C9586" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_CreditFacilityNameAxis_86D87D41AB9C73B1A2EA080AB19C8CC3" xlink:to="loc_unh_CreditFacilityNameDomain_0D493204B41167DFD70D080AB19C9586" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FiveYear30BillionCreditFacilityMember" xlink:label="loc_unh_FiveYear30BillionCreditFacilityMember_0A782C5512621E5A5387080AB19C7036" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_CreditFacilityNameDomain_0D493204B41167DFD70D080AB19C9586" xlink:to="loc_unh_FiveYear30BillionCreditFacilityMember_0A782C5512621E5A5387080AB19C7036" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_A364Day10BillionCreditFacilityMember" xlink:label="loc_unh_A364Day10BillionCreditFacilityMember_F477E49BD6D27AABB374080AB19CE3FC" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_CreditFacilityNameDomain_0D493204B41167DFD70D080AB19C9586" xlink:to="loc_unh_A364Day10BillionCreditFacilityMember_F477E49BD6D27AABB374080AB19CE3FC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_B260461D3BB69506B5D1080AB19C785C" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_F4C0B941A43AD99301C4080AB195CD4E" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_B260461D3BB69506B5D1080AB19C785C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_1B8EA32B5C1528761E11080AB19C7E5F_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_B260461D3BB69506B5D1080AB19C785C" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_1B8EA32B5C1528761E11080AB19C7E5F_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_1B8EA32B5C1528761E11080AB19C7E5F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_B260461D3BB69506B5D1080AB19C785C" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_1B8EA32B5C1528761E11080AB19C7E5F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="loc_us-gaap_CommercialPaperMember_99045D11DA13F6F69F97080AB1A180FD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_1B8EA32B5C1528761E11080AB19C7E5F" xlink:to="loc_us-gaap_CommercialPaperMember_99045D11DA13F6F69F97080AB1A180FD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_B7319E54FC1CFB2D672C080AB1A2BAB2" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_F4C0B941A43AD99301C4080AB195CD4E" xlink:to="loc_us-gaap_RangeAxis_B7319E54FC1CFB2D672C080AB1A2BAB2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_1A3E23036859830F9DB7080AB1A2441C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_B7319E54FC1CFB2D672C080AB1A2BAB2" xlink:to="loc_us-gaap_RangeMember_1A3E23036859830F9DB7080AB1A2441C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_1A3E23036859830F9DB7080AB1A2441C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_B7319E54FC1CFB2D672C080AB1A2BAB2" xlink:to="loc_us-gaap_RangeMember_1A3E23036859830F9DB7080AB1A2441C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_16C8FE178CC009DD3A70080AB1A28573" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_1A3E23036859830F9DB7080AB1A2441C" xlink:to="loc_us-gaap_MinimumMember_16C8FE178CC009DD3A70080AB1A28573" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_4912C8BD71099865F720080AB1A2F216" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_1A3E23036859830F9DB7080AB1A2441C" xlink:to="loc_us-gaap_MaximumMember_4912C8BD71099865F720080AB1A2F216" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_E60C9307CE4E757B3CB0080AB1A25C3B" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_F4C0B941A43AD99301C4080AB195CD4E" xlink:to="loc_us-gaap_CreditFacilityAxis_E60C9307CE4E757B3CB0080AB1A25C3B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_DC487FD543CD43C3BA3F080AB1A247C9_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_E60C9307CE4E757B3CB0080AB1A25C3B" xlink:to="loc_us-gaap_CreditFacilityDomain_DC487FD543CD43C3BA3F080AB1A247C9_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_DC487FD543CD43C3BA3F080AB1A247C9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_E60C9307CE4E757B3CB0080AB1A25C3B" xlink:to="loc_us-gaap_CreditFacilityDomain_DC487FD543CD43C3BA3F080AB1A247C9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_569C437122F08DBCD34D080AB1A3B3C0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_DC487FD543CD43C3BA3F080AB1A247C9" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_569C437122F08DBCD34D080AB1A3B3C0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLongTermDebt" xlink:label="loc_us-gaap_OtherLongTermDebt_16DA9286AC332816B51F080AB1A325D3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_us-gaap_OtherLongTermDebt_16DA9286AC332816B51F080AB1A325D3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLongTermDebtCurrent" xlink:label="loc_us-gaap_OtherLongTermDebtCurrent_DA39D568DB43FA3E393D080AB1A303F8" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_us-gaap_OtherLongTermDebtCurrent_DA39D568DB43FA3E393D080AB1A303F8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_C2FF0F878D0A53FA1604080AB1A33C63" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_C2FF0F878D0A53FA1604080AB1A33C63" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtWeightedAverageInterestRate" xlink:label="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_A35B9A13FC7B2F00BAE6080AB1A36A36" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_A35B9A13FC7B2F00BAE6080AB1A36A36" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1A399707754C0224DE82080AB1A975AE" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1A399707754C0224DE82080AB1A975AE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_90E4AB41AA327B22F625080AB1A91EBE" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_90E4AB41AA327B22F625080AB1A91EBE" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_NumberOfYearsOfRevolvingBankCredit" xlink:label="loc_unh_NumberOfYearsOfRevolvingBankCredit_738E407BFFD45297DCA7080AB1A99D94" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_unh_NumberOfYearsOfRevolvingBankCredit_738E407BFFD45297DCA7080AB1A99D94" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CreditFacilityNumberOfDays" xlink:label="loc_unh_CreditFacilityNumberOfDays_EFD57C363C88A2B610AB080AB1A92E1A" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_unh_CreditFacilityNumberOfDays_EFD57C363C88A2B610AB080AB1A92E1A" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_NumberOfBanksThatCompriseRevolvingBankCreditFacility" xlink:label="loc_unh_NumberOfBanksThatCompriseRevolvingBankCreditFacility_6A1B146EB6C192DE1DD5080AB1A942C9" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_unh_NumberOfBanksThatCompriseRevolvingBankCreditFacility_6A1B146EB6C192DE1DD5080AB1A942C9" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_MaximumPercentageOfIndebtednessToTotalNetCapitalBankCovenant" xlink:label="loc_unh_MaximumPercentageOfIndebtednessToTotalNetCapitalBankCovenant_B4B7A6ABF6E31247EF31080AB1A9BCE5" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0AC92389EF37993BADA0080AB1A3A200" xlink:to="loc_unh_MaximumPercentageOfIndebtednessToTotalNetCapitalBankCovenant_B4B7A6ABF6E31247EF31080AB1A9BCE5" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/CommercialPaperAndLongTermDebtPolicyPolicies" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/CommercialPaperAndLongTermDebtTables" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_DE66F7C8D637C3B19BC4080AD1EF0F68" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_D602EBCBEF68BABA1123080AD1E863F6" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DE66F7C8D637C3B19BC4080AD1EF0F68" xlink:to="loc_us-gaap_DebtInstrumentTable_D602EBCBEF68BABA1123080AD1E863F6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_A018278D2F42076BE66008FE0178A509" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_D602EBCBEF68BABA1123080AD1E863F6" xlink:to="loc_us-gaap_StatementScenarioAxis_A018278D2F42076BE66008FE0178A509" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_389E8AE611C7277117C708FE017EDB23_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_A018278D2F42076BE66008FE0178A509" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_389E8AE611C7277117C708FE017EDB23_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_389E8AE611C7277117C708FE017EDB23" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_A018278D2F42076BE66008FE0178A509" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_389E8AE611C7277117C708FE017EDB23" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfDebtInstrumentsTextBlock" xlink:label="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_59B8518AB1EA6E499CB9080AD1F06AC6" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DE66F7C8D637C3B19BC4080AD1EF0F68" xlink:to="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_59B8518AB1EA6E499CB9080AD1F06AC6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_90BF0305E006740D6682080AD1EF8CC2" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DE66F7C8D637C3B19BC4080AD1EF0F68" xlink:to="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_90BF0305E006740D6682080AD1EF8CC2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock" xlink:label="loc_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock_79D84D71E45881B3D59D080AD1F08DCC" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DE66F7C8D637C3B19BC4080AD1EF0F68" xlink:to="loc_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock_79D84D71E45881B3D59D080AD1F08DCC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock" xlink:label="loc_us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_37C077C28E42EDA0DBD5080AD1F08F2F" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DE66F7C8D637C3B19BC4080AD1EF0F68" xlink:to="loc_us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_37C077C28E42EDA0DBD5080AD1F08F2F" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/CommitmentsAndContingencies" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/CommitmentsAndContingenciesCommitmentsAndContingenciesFutureLeasePaymentsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_4112D1C6079F98679705F8973E11EDBA" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_4EAA54C76C9C460BA23FF8973E112D7F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4112D1C6079F98679705F8973E11EDBA" xlink:to="loc_us-gaap_StatementTable_4EAA54C76C9C460BA23FF8973E112D7F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_D95AF75A76690BD7D930F8AE7194DAD2" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4EAA54C76C9C460BA23FF8973E112D7F" xlink:to="loc_us-gaap_StatementScenarioAxis_D95AF75A76690BD7D930F8AE7194DAD2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8968B32F955D6325EE35F8AE719C6E1E_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_D95AF75A76690BD7D930F8AE7194DAD2" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8968B32F955D6325EE35F8AE719C6E1E_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8968B32F955D6325EE35F8AE719C6E1E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_D95AF75A76690BD7D930F8AE7194DAD2" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8968B32F955D6325EE35F8AE719C6E1E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_D45CAD992D5774169AD5F8973E11A529" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4112D1C6079F98679705F8973E11EDBA" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_D45CAD992D5774169AD5F8973E11A529" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_40EE801CB4885A3669CBF8973E1745A2" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4112D1C6079F98679705F8973E11EDBA" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_40EE801CB4885A3669CBF8973E1745A2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_2BF67EC6A8630ED5F5D8F8973E172AA0" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4112D1C6079F98679705F8973E11EDBA" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_2BF67EC6A8630ED5F5D8F8973E172AA0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_CA7AEA0AB8EB0F46F849F8973E1794FC" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4112D1C6079F98679705F8973E11EDBA" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_CA7AEA0AB8EB0F46F849F8973E1794FC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_E3E810DA63ED81F2729AF8973E170FBD" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4112D1C6079F98679705F8973E11EDBA" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_E3E810DA63ED81F2729AF8973E170FBD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_5B847C55BC0D7A26DA55F8973E17A501" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4112D1C6079F98679705F8973E11EDBA" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_5B847C55BC0D7A26DA55F8973E17A501" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/CommitmentsAndContingenciesCommitmentsAndContingenciesTables" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_5AFF19085C89CDEB5533F8973E585A06" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_699DD942DE809EFBBB0AF8973E586E64" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_5AFF19085C89CDEB5533F8973E585A06" xlink:to="loc_us-gaap_StatementTable_699DD942DE809EFBBB0AF8973E586E64" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_1BE19B9B6B83895EB038F8AE1D9562CD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_699DD942DE809EFBBB0AF8973E586E64" xlink:to="loc_us-gaap_StatementScenarioAxis_1BE19B9B6B83895EB038F8AE1D9562CD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_2077BB720706FC970661F8AE1D96088D_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_1BE19B9B6B83895EB038F8AE1D9562CD" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_2077BB720706FC970661F8AE1D96088D_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_2077BB720706FC970661F8AE1D96088D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_1BE19B9B6B83895EB038F8AE1D9562CD" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_2077BB720706FC970661F8AE1D96088D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock" xlink:label="loc_us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock_95F5EEF6B38DE0770379F8973E58EE63" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5AFF19085C89CDEB5533F8973E585A06" xlink:to="loc_us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock_95F5EEF6B38DE0770379F8973E58EE63" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/CommitmentsAndContingenciesDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_2419D9A88F93ED5D80A268B739D98AC6" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_3C066D4FEE1F62D929D768B739D3172C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2419D9A88F93ED5D80A268B739D98AC6" xlink:to="loc_us-gaap_LossContingenciesTable_3C066D4FEE1F62D929D768B739D3172C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LitigationCaseAxis" xlink:label="loc_us-gaap_LitigationCaseAxis_B8CAA5080E905BAACC8B68B739D3D2A3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_3C066D4FEE1F62D929D768B739D3172C" xlink:to="loc_us-gaap_LitigationCaseAxis_B8CAA5080E905BAACC8B68B739D3D2A3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_36E95BE8707007B4D5AA68B739D38F16_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationCaseAxis_B8CAA5080E905BAACC8B68B739D3D2A3" xlink:to="loc_us-gaap_LitigationCaseTypeDomain_36E95BE8707007B4D5AA68B739D38F16_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_36E95BE8707007B4D5AA68B739D38F16" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationCaseAxis_B8CAA5080E905BAACC8B68B739D3D2A3" xlink:to="loc_us-gaap_LitigationCaseTypeDomain_36E95BE8707007B4D5AA68B739D38F16" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_EndoscopyCenterOfSouthernNevadaLitigationMember" xlink:label="loc_unh_EndoscopyCenterOfSouthernNevadaLitigationMember_9980DA6CF1B16F266F4468B739D307A2" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationCaseTypeDomain_36E95BE8707007B4D5AA68B739D38F16" xlink:to="loc_unh_EndoscopyCenterOfSouthernNevadaLitigationMember_9980DA6CF1B16F266F4468B739D307A2" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_LitigationDamagesAxis" xlink:label="loc_unh_LitigationDamagesAxis_209F97463AEA7CBB9D7E68B739D3726B" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_3C066D4FEE1F62D929D768B739D3172C" xlink:to="loc_unh_LitigationDamagesAxis_209F97463AEA7CBB9D7E68B739D3726B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_LitigationDamagesDomain" xlink:label="loc_unh_LitigationDamagesDomain_2F44A34C88659334909A68B739D4F230_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_LitigationDamagesAxis_209F97463AEA7CBB9D7E68B739D3726B" xlink:to="loc_unh_LitigationDamagesDomain_2F44A34C88659334909A68B739D4F230_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_LitigationDamagesDomain" xlink:label="loc_unh_LitigationDamagesDomain_2F44A34C88659334909A68B739D4F230" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_LitigationDamagesAxis_209F97463AEA7CBB9D7E68B739D3726B" xlink:to="loc_unh_LitigationDamagesDomain_2F44A34C88659334909A68B739D4F230" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CompensatoryDamagesMember" xlink:label="loc_unh_CompensatoryDamagesMember_BC05F3C18B0CD262E6B468B739D43783" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_LitigationDamagesDomain_2F44A34C88659334909A68B739D4F230" xlink:to="loc_unh_CompensatoryDamagesMember_BC05F3C18B0CD262E6B468B739D43783" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_PunitiveDamagesMember" xlink:label="loc_unh_PunitiveDamagesMember_BACE95FF5A91D45ECE3D68B739D42727" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_LitigationDamagesDomain_2F44A34C88659334909A68B739D4F230" xlink:to="loc_unh_PunitiveDamagesMember_BACE95FF5A91D45ECE3D68B739D42727" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_PostTrialMotionsReducedOverallAwardMember" xlink:label="loc_unh_PostTrialMotionsReducedOverallAwardMember_578CE0DEBF116F07043968B739D4924A" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_LitigationDamagesDomain_2F44A34C88659334909A68B739D4F230" xlink:to="loc_unh_PostTrialMotionsReducedOverallAwardMember_578CE0DEBF116F07043968B739D4924A" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CommitmentsAndContingenciesDisclosureAxis" xlink:label="loc_unh_CommitmentsAndContingenciesDisclosureAxis_15F032F95D4EC249327D68B739D45C45" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_3C066D4FEE1F62D929D768B739D3172C" xlink:to="loc_unh_CommitmentsAndContingenciesDisclosureAxis_15F032F95D4EC249327D68B739D45C45" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_7FCD33352BAFA5A82EBC68B739D99E41_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_CommitmentsAndContingenciesDisclosureAxis_15F032F95D4EC249327D68B739D45C45" xlink:to="loc_us-gaap_LossContingencyNatureDomain_7FCD33352BAFA5A82EBC68B739D99E41_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_7FCD33352BAFA5A82EBC68B739D99E41" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_CommitmentsAndContingenciesDisclosureAxis_15F032F95D4EC249327D68B739D45C45" xlink:to="loc_us-gaap_LossContingencyNatureDomain_7FCD33352BAFA5A82EBC68B739D99E41" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CaliforniaClaimsProcessingMatterMember" xlink:label="loc_unh_CaliforniaClaimsProcessingMatterMember_5320FE54B097627BC19068B739D954DB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_7FCD33352BAFA5A82EBC68B739D99E41" xlink:to="loc_unh_CaliforniaClaimsProcessingMatterMember_5320FE54B097627BC19068B739D954DB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LeaseAndRentalExpense" xlink:label="loc_us-gaap_LeaseAndRentalExpense_BA46A7F66E073DB5769869737CE76F18" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2419D9A88F93ED5D80A268B739D98AC6" xlink:to="loc_us-gaap_LeaseAndRentalExpense_BA46A7F66E073DB5769869737CE76F18" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_UndrawnLettersOfCredit" xlink:label="loc_unh_UndrawnLettersOfCredit_6A6792A2203415F6F6D06976CE49C0FB" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2419D9A88F93ED5D80A268B739D98AC6" xlink:to="loc_unh_UndrawnLettersOfCredit_6A6792A2203415F6F6D06976CE49C0FB" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SuretyBondsOutstanding" xlink:label="loc_unh_SuretyBondsOutstanding_93C641129ECB1CD5778D6974BC872323" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2419D9A88F93ED5D80A268B739D98AC6" xlink:to="loc_unh_SuretyBondsOutstanding_93C641129ECB1CD5778D6974BC872323" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_EstimatedLargestAggregatePenaltyIssuedByCdi" xlink:label="loc_unh_EstimatedLargestAggregatePenaltyIssuedByCdi_5FC14C2105170AEDBDAF68B739D9BAE6" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2419D9A88F93ED5D80A268B739D98AC6" xlink:to="loc_unh_EstimatedLargestAggregatePenaltyIssuedByCdi_5FC14C2105170AEDBDAF68B739D9BAE6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_FF00141E832EA6BC1EA268B739D9860D" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2419D9A88F93ED5D80A268B739D98AC6" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_FF00141E832EA6BC1EA268B739D9860D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyDamagesAwardedValue" xlink:label="loc_us-gaap_LossContingencyDamagesAwardedValue_7C9616A3397E15AA72DB68B739DA8B6B" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2419D9A88F93ED5D80A268B739D98AC6" xlink:to="loc_us-gaap_LossContingencyDamagesAwardedValue_7C9616A3397E15AA72DB68B739DA8B6B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyPendingClaimsNumber" xlink:label="loc_us-gaap_LossContingencyPendingClaimsNumber_0EB396B9E04604B7001168B739DA9F53" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2419D9A88F93ED5D80A268B739D98AC6" xlink:to="loc_us-gaap_LossContingencyPendingClaimsNumber_0EB396B9E04604B7001168B739DA9F53" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ConsolidatedBalanceSheetParentheticalConsolidatedBalanceSheetParenthetical" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_C1EEA298BE7344EFBF7C599AF07FE066" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_StatementTable_C1EEA298BE7344EFBF7C599AF07FE066" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_8BDB24E8797C0B7CD47F599AF07FA32C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_C1EEA298BE7344EFBF7C599AF07FE066" xlink:to="loc_us-gaap_StatementScenarioAxis_8BDB24E8797C0B7CD47F599AF07FA32C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_07975F344FC4C8780985599AF080694D_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_8BDB24E8797C0B7CD47F599AF07FA32C" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_07975F344FC4C8780985599AF080694D_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_07975F344FC4C8780985599AF080694D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_8BDB24E8797C0B7CD47F599AF07FA32C" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_07975F344FC4C8780985599AF080694D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_875D2751500DAA99B3CD599AF0802214" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_C1EEA298BE7344EFBF7C599AF07FE066" xlink:to="loc_us-gaap_StatementClassOfStockAxis_875D2751500DAA99B3CD599AF0802214" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_58B95360CF504B622DA1599AF0804F38_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_875D2751500DAA99B3CD599AF0802214" xlink:to="loc_us-gaap_ClassOfStockDomain_58B95360CF504B622DA1599AF0804F38_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_58B95360CF504B622DA1599AF0804F38" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_875D2751500DAA99B3CD599AF0802214" xlink:to="loc_us-gaap_ClassOfStockDomain_58B95360CF504B622DA1599AF0804F38" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_0B6C2E622838D1B3AFA6599AF1390B9B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_0B6C2E622838D1B3AFA6599AF1390B9B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent_D69D5D0E03763CF28C7E599EA2398331" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent_D69D5D0E03763CF28C7E599EA2398331" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_4330916214F09093D12C599EC30CC740" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_4330916214F09093D12C599EC30CC740" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_23BAE67D212BDF4F8A76599EF3537408" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_23BAE67D212BDF4F8A76599EF3537408" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_6EE50DF890EF4746577E599AF0812E22" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_6EE50DF890EF4746577E599AF0812E22" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_3A706EB7907849B1B0CD599AF081DF6A" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_3A706EB7907849B1B0CD599AF081DF6A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_19246868F2CECC028612599AF081CFAA" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_CommonStockSharesIssued_19246868F2CECC028612599AF081CFAA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_D5C4CA09B6F79B1663B6599AF0819278" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_D5C4CA09B6F79B1663B6599AF0819278" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_9CF00FC10404C01CCEF9599AF081CF86" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_9CF00FC10404C01CCEF9599AF081CF86" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_AC08D78DF77327FED3B3599AF081F742" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_AC08D78DF77327FED3B3599AF081F742" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_714BC39B9864A72EA735599AF081B8A4" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_PreferredStockSharesIssued_714BC39B9864A72EA735599AF081B8A4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_C459077AFE48625240B7599AF081D47E" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA5ACDEEA25CEDE17DAE599AF08079CB" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_C459077AFE48625240B7599AF081D47E" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_8803FFB0BC2BA59F3391270E5DC53A1F" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_2A648546779F5B904280270E5DC5AEE8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_8803FFB0BC2BA59F3391270E5DC53A1F" xlink:to="loc_us-gaap_StatementTable_2A648546779F5B904280270E5DC5AEE8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_2C75A049B0F5608F40BE270E5DC593F8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2A648546779F5B904280270E5DC5AEE8" xlink:to="loc_us-gaap_StatementScenarioAxis_2C75A049B0F5608F40BE270E5DC593F8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_1A9C4B2C8E0CF76D0584270E5DC519F1_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_2C75A049B0F5608F40BE270E5DC593F8" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_1A9C4B2C8E0CF76D0584270E5DC519F1_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_1A9C4B2C8E0CF76D0584270E5DC519F1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_2C75A049B0F5608F40BE270E5DC593F8" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_1A9C4B2C8E0CF76D0584270E5DC519F1" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_A8A1C9D2D1D44B8650A7226DE4DD3D1E" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_D28ABE51F566114E3117226DE4DB00E5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_A8A1C9D2D1D44B8650A7226DE4DD3D1E" xlink:to="loc_us-gaap_StatementTable_D28ABE51F566114E3117226DE4DB00E5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_570CE017B5ED08AD108C226DE4DB0701" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D28ABE51F566114E3117226DE4DB00E5" xlink:to="loc_us-gaap_StatementScenarioAxis_570CE017B5ED08AD108C226DE4DB0701" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_776081A7709B1C8525CB226DE4DCC4CB_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_570CE017B5ED08AD108C226DE4DB0701" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_776081A7709B1C8525CB226DE4DCC4CB_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_776081A7709B1C8525CB226DE4DCC4CB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_570CE017B5ED08AD108C226DE4DB0701" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_776081A7709B1C8525CB226DE4DCC4CB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityTotalMember" xlink:label="loc_us-gaap_StockholdersEquityTotalMember_4A97BAD51AEA3CA7D648226DE4DCA773" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_776081A7709B1C8525CB226DE4DCC4CB" xlink:to="loc_us-gaap_StockholdersEquityTotalMember_4A97BAD51AEA3CA7D648226DE4DCA773" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ForeignCurrencyTranslationLossesAxis" xlink:label="loc_unh_ForeignCurrencyTranslationLossesAxis_502AC706B79211B668C4226DE4DC18F0" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D28ABE51F566114E3117226DE4DB00E5" xlink:to="loc_unh_ForeignCurrencyTranslationLossesAxis_502AC706B79211B668C4226DE4DC18F0" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ForeignCurrencyTranslationGainsLossesDomain" xlink:label="loc_unh_ForeignCurrencyTranslationGainsLossesDomain_E10CD7EBC002A82D49E2226DE4DCAC8E_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_ForeignCurrencyTranslationLossesAxis_502AC706B79211B668C4226DE4DC18F0" xlink:to="loc_unh_ForeignCurrencyTranslationGainsLossesDomain_E10CD7EBC002A82D49E2226DE4DCAC8E_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ForeignCurrencyTranslationGainsLossesDomain" xlink:label="loc_unh_ForeignCurrencyTranslationGainsLossesDomain_E10CD7EBC002A82D49E2226DE4DCAC8E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_ForeignCurrencyTranslationLossesAxis_502AC706B79211B668C4226DE4DC18F0" xlink:to="loc_unh_ForeignCurrencyTranslationGainsLossesDomain_E10CD7EBC002A82D49E2226DE4DCAC8E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCurrencyGainLossMember" xlink:label="loc_us-gaap_ForeignCurrencyGainLossMember_273755CB67A5778EF3C7226DE4DC7DEA" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_ForeignCurrencyTranslationGainsLossesDomain_E10CD7EBC002A82D49E2226DE4DCAC8E" xlink:to="loc_us-gaap_ForeignCurrencyGainLossMember_273755CB67A5778EF3C7226DE4DC7DEA" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_NetUnrealizedGainsLossesOnInvestmentsAxis" xlink:label="loc_unh_NetUnrealizedGainsLossesOnInvestmentsAxis_47F014A69E2D1DC6AB20226DE4DC303D" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D28ABE51F566114E3117226DE4DB00E5" xlink:to="loc_unh_NetUnrealizedGainsLossesOnInvestmentsAxis_47F014A69E2D1DC6AB20226DE4DC303D" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_NetUnrealizedGainsOnInvestmentsDomain" xlink:label="loc_unh_NetUnrealizedGainsOnInvestmentsDomain_EB6DB711B581C0860C0E226DE4DCA0FF_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_NetUnrealizedGainsLossesOnInvestmentsAxis_47F014A69E2D1DC6AB20226DE4DC303D" xlink:to="loc_unh_NetUnrealizedGainsOnInvestmentsDomain_EB6DB711B581C0860C0E226DE4DCA0FF_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_NetUnrealizedGainsOnInvestmentsDomain" xlink:label="loc_unh_NetUnrealizedGainsOnInvestmentsDomain_EB6DB711B581C0860C0E226DE4DCA0FF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_NetUnrealizedGainsLossesOnInvestmentsAxis_47F014A69E2D1DC6AB20226DE4DC303D" xlink:to="loc_unh_NetUnrealizedGainsOnInvestmentsDomain_EB6DB711B581C0860C0E226DE4DCA0FF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_58A6DE5887D72132623D226DE4DC580A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_NetUnrealizedGainsOnInvestmentsDomain_EB6DB711B581C0860C0E226DE4DCA0FF" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_58A6DE5887D72132623D226DE4DC580A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_235640D4DCC9EA53A5AE226DE4DC90DA" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D28ABE51F566114E3117226DE4DB00E5" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_235640D4DCC9EA53A5AE226DE4DC90DA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_39345593BE9C1B9EB628226DE4DCF894_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_235640D4DCC9EA53A5AE226DE4DC90DA" xlink:to="loc_us-gaap_EquityComponentDomain_39345593BE9C1B9EB628226DE4DCF894_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_39345593BE9C1B9EB628226DE4DCF894" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_235640D4DCC9EA53A5AE226DE4DC90DA" xlink:to="loc_us-gaap_EquityComponentDomain_39345593BE9C1B9EB628226DE4DCF894" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_FDE847D5DAAFE1158102226DE4DD8777" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_39345593BE9C1B9EB628226DE4DCF894" xlink:to="loc_us-gaap_CommonStockMember_FDE847D5DAAFE1158102226DE4DD8777" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_679DA39954805AF9AB0D226DE4DD17C0" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_39345593BE9C1B9EB628226DE4DCF894" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_679DA39954805AF9AB0D226DE4DD17C0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_962BAC6FDC09F719C40E226DE4DD1620" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_39345593BE9C1B9EB628226DE4DCF894" xlink:to="loc_us-gaap_RetainedEarningsMember_962BAC6FDC09F719C40E226DE4DD1620" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_E812EFA6B9114D864721226DE4DD6490" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_39345593BE9C1B9EB628226DE4DCF894" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_E812EFA6B9114D864721226DE4DD6490" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A8A1C9D2D1D44B8650A7226DE4DD3D1E" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_E31BAAEF6ABE100B2FE0226DE4DD61D9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_StockholdersEquity_E31BAAEF6ABE100B2FE0226DE4DD61D9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_776C628D3F5156A9302C226DE4DD6A69" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_776C628D3F5156A9302C226DE4DD6A69" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_63263217BD4B12343350226DE4DDDF77" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_NetIncomeLoss_63263217BD4B12343350226DE4DDDF77" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_5DA50CEB9DEE50CB3831226DE4DD9350" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_5DA50CEB9DEE50CB3831226DE4DD9350" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_786929CD244325815361226DE4DDA00C" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_786929CD244325815361226DE4DDA00C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2BFC2D23489CFF6EBBCC226DE4DDC3BF" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2BFC2D23489CFF6EBBCC226DE4DDC3BF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_A31DF205E93EE2984135226DE4DD4D30" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_A31DF205E93EE2984135226DE4DD4D30" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_CEBF441DA86639032021226DE4DD1FBA" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_CEBF441DA86639032021226DE4DD1FBA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_8D1EE9F4F8D9458C4382226DE4DE6FF7" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_8D1EE9F4F8D9458C4382226DE4DE6FF7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_E683678C5DCE400FCFD9226DE4DEB019" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_E683678C5DCE400FCFD9226DE4DEB019" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_B1471887101A52FD65C9226DE4DE19ED" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_B1471887101A52FD65C9226DE4DE19ED" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_483A203281AE5E47CA8B226DE4DE4828" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_483A203281AE5E47CA8B226DE4DE4828" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_Acquisitionsofnoncontrollinginterestsandrelatedtaxeffects" xlink:label="loc_unh_Acquisitionsofnoncontrollinginterestsandrelatedtaxeffects_C1E3BD4A51C8CFB367BF226DE4DE289C" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_unh_Acquisitionsofnoncontrollinginterestsandrelatedtaxeffects_C1E3BD4A51C8CFB367BF226DE4DE289C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendsCash" xlink:label="loc_us-gaap_DividendsCash_29E0F13F5EB1DB0CB16C226DE4DE39B5" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A9FB8CA1C4304494D04E226DE4DDF86F" xlink:to="loc_us-gaap_DividendsCash_29E0F13F5EB1DB0CB16C226DE4DE39B5" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_4928B20A211A6535FC9E0325F5C65AA0" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_30C206511C4723BA7F810325F5C6464E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4928B20A211A6535FC9E0325F5C65AA0" xlink:to="loc_us-gaap_StatementTable_30C206511C4723BA7F810325F5C6464E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_BF75A99E79782FD002720325F5C61D37" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_30C206511C4723BA7F810325F5C6464E" xlink:to="loc_us-gaap_StatementScenarioAxis_BF75A99E79782FD002720325F5C61D37" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_BF119584001567203DFE0325F5C68398_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_BF75A99E79782FD002720325F5C61D37" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_BF119584001567203DFE0325F5C68398_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_BF119584001567203DFE0325F5C68398" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_BF75A99E79782FD002720325F5C61D37" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_BF119584001567203DFE0325F5C68398" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_B3E6F322A819CBBD7F8E0325F5C63C2B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4928B20A211A6535FC9E0325F5C65AA0" xlink:to="loc_us-gaap_ProfitLoss_B3E6F322A819CBBD7F8E0325F5C63C2B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4928B20A211A6535FC9E0325F5C65AA0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_829BA06E30643037C2580325F5C7F470" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_829BA06E30643037C2580325F5C7F470" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_160A5CE7BF2F8BB893B40325F5C750E1" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_160A5CE7BF2F8BB893B40325F5C750E1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_52470075D97D5EC351540325F5C79110" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_52470075D97D5EC351540325F5C79110" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_ECBF479597D0112486AC0325F5C7D128" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_ECBF479597D0112486AC0325F5C7D128" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_83A0B6F37D456B2822C30325F5C7A21D" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_83A0B6F37D456B2822C30325F5C7A21D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_0CDF2FF299EC28DB18F30325F5C7AC16" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_0CDF2FF299EC28DB18F30325F5C7AC16" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_BE4ACD3B2DC7ADC17D4C0325F5C7C7AD" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_BE4ACD3B2DC7ADC17D4C0325F5C7C7AD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_90E407C9DB3ADDD10FE10325F5C73983" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_90E407C9DB3ADDD10FE10325F5C73983" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_4A3800CE7C46447438350325F5C72FC5" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_49AB9069781746058D2E0325F5C78684" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_4A3800CE7C46447438350325F5C72FC5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_9948644E5FB703503F7B0325F5C7D21D" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4928B20A211A6535FC9E0325F5C65AA0" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_9948644E5FB703503F7B0325F5C7D21D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_7DB56770F90DC67AFAA60325F5C7130E" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4928B20A211A6535FC9E0325F5C65AA0" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_7DB56770F90DC67AFAA60325F5C7130E" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_C7A8C21B125EF6E484F659B0AEDAED62" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_C32675227CE95C0D04B359B0AED929C8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_C7A8C21B125EF6E484F659B0AEDAED62" xlink:to="loc_us-gaap_StatementTable_C32675227CE95C0D04B359B0AED929C8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_199618649248D8C40BEA59B0AED904ED" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_C32675227CE95C0D04B359B0AED929C8" xlink:to="loc_us-gaap_StatementScenarioAxis_199618649248D8C40BEA59B0AED904ED" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_45BBC56FE457174F323059B0AEDAAB72_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_199618649248D8C40BEA59B0AED904ED" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_45BBC56FE457174F323059B0AEDAAB72_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_45BBC56FE457174F323059B0AEDAAB72" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_199618649248D8C40BEA59B0AED904ED" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_45BBC56FE457174F323059B0AEDAAB72" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/DescriptionOfBusinessDetails" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/DescriptionOfBusinessNotes" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/DescriptionOfBusinessTables" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/DocumentAndEntityInformationDocument" xlink:type="extended">
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentInformationLineItems" xlink:label="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:type="locator"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityListingsTable" xlink:label="loc_dei_EntityListingsTable_BAB29CBDBC6BC88577CC02F63084EB9D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_EntityListingsTable_BAB29CBDBC6BC88577CC02F63084EB9D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentInformationDocumentAxis" xlink:label="loc_dei_DocumentInformationDocumentAxis_432BA3623261B73E821E02F630842EA5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityListingsTable_BAB29CBDBC6BC88577CC02F63084EB9D" xlink:to="loc_dei_DocumentInformationDocumentAxis_432BA3623261B73E821E02F630842EA5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentDomain" xlink:label="loc_dei_DocumentDomain_0A66A09877117E47CC1D02F63084C203_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_DocumentInformationDocumentAxis_432BA3623261B73E821E02F630842EA5" xlink:to="loc_dei_DocumentDomain_0A66A09877117E47CC1D02F63084C203_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentDomain" xlink:label="loc_dei_DocumentDomain_0A66A09877117E47CC1D02F63084C203" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_DocumentInformationDocumentAxis_432BA3623261B73E821E02F630842EA5" xlink:to="loc_dei_DocumentDomain_0A66A09877117E47CC1D02F63084C203" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_6CA443DF0464616BE48702F6308460DF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_DocumentType_6CA443DF0464616BE48702F6308460DF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_A32768F71EB0AF6768D902F630849BF0" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_AmendmentFlag_A32768F71EB0AF6768D902F630849BF0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_F7533285DE8760FB945E02F630842EAA" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_DocumentPeriodEndDate_F7533285DE8760FB945E02F630842EAA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_F0038BDD412C8E166C9602F630849CC5" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_DocumentFiscalYearFocus_F0038BDD412C8E166C9602F630849CC5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_196E49A5D69B7631373202F63084D7B4" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_DocumentFiscalPeriodFocus_196E49A5D69B7631373202F63084D7B4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_20200305A70E857D9BB402F63085804C" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_EntityRegistrantName_20200305A70E857D9BB402F63085804C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_B99AAA84C0AC285E089B02F63085E928" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_EntityCentralIndexKey_B99AAA84C0AC285E089B02F63085E928" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_5CC88E74865E3FA3AE2C02F63085C15C" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_CurrentFiscalYearEndDate_5CC88E74865E3FA3AE2C02F63085C15C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_BB6A661F7EBBF19714B402F6308593E6" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_EntityFilerCategory_BB6A661F7EBBF19714B402F6308593E6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_CAA99F5099A6A9A940AB02F630855BA6" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_CAA99F5099A6A9A940AB02F630855BA6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_975B2336791505B12E26032CEE24FF25" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_EntityPublicFloat_975B2336791505B12E26032CEE24FF25" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_4A763258E750997B23D602F632434027" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_4A763258E750997B23D602F632434027" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_74D9841514EFE7DD77DE02F6444D17F7" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_EntityCurrentReportingStatus_74D9841514EFE7DD77DE02F6444D17F7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_0E97ADFE3D2333271E7002F6607577C7" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_dei_EntityVoluntaryFilers_0E97ADFE3D2333271E7002F6607577C7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaap_SharePrice_557BA4BEBB6CD4E8B40E02F69B6E3115" xlink:type="locator"/>
<definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_F0E3CDD680EC5ABE043702F630847F59" xlink:to="loc_us-gaap_SharePrice_557BA4BEBB6CD4E8B40E02F69B6E3115" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/FairValue" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_CAE71844542B0ED2BEF3FEA7B7220CF5" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9650CD6B578913A36F08FEA7B71AFDD5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_CAE71844542B0ED2BEF3FEA7B7220CF5" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9650CD6B578913A36F08FEA7B71AFDD5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_E164591429DBDEF9E617FEA7B71A2C6F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9650CD6B578913A36F08FEA7B71AFDD5" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_E164591429DBDEF9E617FEA7B71A2C6F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_00A78E064629AF9545B6FEA7B71A83CC_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_E164591429DBDEF9E617FEA7B71A2C6F" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_00A78E064629AF9545B6FEA7B71A83CC_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_00A78E064629AF9545B6FEA7B71A83CC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_E164591429DBDEF9E617FEA7B71A2C6F" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_00A78E064629AF9545B6FEA7B71A83CC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_3397B9EBF1907B73B430FEA7B71BF3AB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_00A78E064629AF9545B6FEA7B71A83CC" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_3397B9EBF1907B73B430FEA7B71BF3AB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_7ABEB9138427D27691F1FEA7B71B5140" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9650CD6B578913A36F08FEA7B71AFDD5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_7ABEB9138427D27691F1FEA7B71B5140" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_B8484565AC1F20ADC595FEA7B71B368D_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7ABEB9138427D27691F1FEA7B71B5140" xlink:to="loc_us-gaap_SegmentDomain_B8484565AC1F20ADC595FEA7B71B368D_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_B8484565AC1F20ADC595FEA7B71B368D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7ABEB9138427D27691F1FEA7B71B5140" xlink:to="loc_us-gaap_SegmentDomain_B8484565AC1F20ADC595FEA7B71B368D" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AarpProgramMember" xlink:label="loc_unh_AarpProgramMember_DD2BE28911F162CDA056FEA7B71B596A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_B8484565AC1F20ADC595FEA7B71B368D" xlink:to="loc_unh_AarpProgramMember_DD2BE28911F162CDA056FEA7B71B596A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_80856E109CCC170CF135FEA7B71BBACD" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9650CD6B578913A36F08FEA7B71AFDD5" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_80856E109CCC170CF135FEA7B71BBACD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F4C0793573CD1A6AD88AFEA7B71B75EB_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_80856E109CCC170CF135FEA7B71BBACD" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F4C0793573CD1A6AD88AFEA7B71B75EB_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F4C0793573CD1A6AD88AFEA7B71B75EB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_80856E109CCC170CF135FEA7B71BBACD" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F4C0793573CD1A6AD88AFEA7B71B75EB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_3DB0F5E638DD86C1B540FEA7B71B7BDA" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F4C0793573CD1A6AD88AFEA7B71B75EB" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_3DB0F5E638DD86C1B540FEA7B71B7BDA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_BFFD019B193C7A2390D3FEA7B7204A64" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F4C0793573CD1A6AD88AFEA7B71B75EB" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_BFFD019B193C7A2390D3FEA7B7204A64" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_022A6B25DA1E844D2F6BFEA7B720D1C8" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9650CD6B578913A36F08FEA7B71AFDD5" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_022A6B25DA1E844D2F6BFEA7B720D1C8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_0C957630D3652B85AC06FEA7B721570B_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_022A6B25DA1E844D2F6BFEA7B720D1C8" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_0C957630D3652B85AC06FEA7B721570B_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_0C957630D3652B85AC06FEA7B721570B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_022A6B25DA1E844D2F6BFEA7B720D1C8" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_0C957630D3652B85AC06FEA7B721570B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_3D1D78BDDC3BF27A918EFEA7B72183E8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_0C957630D3652B85AC06FEA7B721570B" xlink:to="loc_us-gaap_DebtSecuritiesMember_3D1D78BDDC3BF27A918EFEA7B72183E8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USTreasuryAndGovernmentMember" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_CFEECB2D1A5F080A1412FEA7B7210ED9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_3D1D78BDDC3BF27A918EFEA7B72183E8" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_CFEECB2D1A5F080A1412FEA7B7210ED9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_F1AE0740B1ED58ABEE4BFEA7B721E1C0" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_3D1D78BDDC3BF27A918EFEA7B72183E8" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_F1AE0740B1ED58ABEE4BFEA7B721E1C0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_3F8C5B155553A4F40733FEA7B7211CFD" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_3D1D78BDDC3BF27A918EFEA7B72183E8" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_3F8C5B155553A4F40733FEA7B7211CFD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_1A5900446895E6F7977FFEA7B721DB7A" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_3D1D78BDDC3BF27A918EFEA7B72183E8" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_1A5900446895E6F7977FFEA7B721DB7A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_53B1C4DDE6D29BD517A6FEA7B722B96D" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_3D1D78BDDC3BF27A918EFEA7B72183E8" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_53B1C4DDE6D29BD517A6FEA7B722B96D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_CA5B879FDD89CC89CFAFFEA7B7229F0B" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_0C957630D3652B85AC06FEA7B721570B" xlink:to="loc_us-gaap_EquitySecuritiesMember_CA5B879FDD89CC89CFAFFEA7B7229F0B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_33F5E1B0CF9743773412FEA7B722C047" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CAE71844542B0ED2BEF3FEA7B7220CF5" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_33F5E1B0CF9743773412FEA7B722C047" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_5C0521BFD15447BBEA74FEA7B7226C91" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CAE71844542B0ED2BEF3FEA7B7220CF5" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_5C0521BFD15447BBEA74FEA7B7226C91" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesEquitySecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesEquitySecurities_9518FDDB940AE1CE5205FEA7B722E727" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CAE71844542B0ED2BEF3FEA7B7220CF5" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesEquitySecurities_9518FDDB940AE1CE5205FEA7B722E727" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsFairValueDisclosureRecurring" xlink:label="loc_us-gaap_AssetsFairValueDisclosureRecurring_E6C64678AFE02290EE60FEA7B722EDBD" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CAE71844542B0ED2BEF3FEA7B7220CF5" xlink:to="loc_us-gaap_AssetsFairValueDisclosureRecurring_E6C64678AFE02290EE60FEA7B722EDBD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_2F8BAD6FEC0385DBDADCFEA7B7221F45" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CAE71844542B0ED2BEF3FEA7B7220CF5" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_2F8BAD6FEC0385DBDADCFEA7B7221F45" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/FairValueFairValueInputsAssetsQuantitativeInformationDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_93A1DB8626376EED4FF15CD9E25435C3" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_D5A332A4CC88F110C0455CD9E252DF97" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_93A1DB8626376EED4FF15CD9E25435C3" xlink:to="loc_us-gaap_StatementTable_D5A332A4CC88F110C0455CD9E252DF97" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C6E2010CECDB4ACE68635CD9E252C3FD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D5A332A4CC88F110C0455CD9E252DF97" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C6E2010CECDB4ACE68635CD9E252C3FD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C89CD39E0BBFC0C879A55CD9E252600D_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C6E2010CECDB4ACE68635CD9E252C3FD" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C89CD39E0BBFC0C879A55CD9E252600D_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C89CD39E0BBFC0C879A55CD9E252600D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C6E2010CECDB4ACE68635CD9E252C3FD" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C89CD39E0BBFC0C879A55CD9E252600D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_82D4CAF13C10B72194205CD9E2524642" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_C89CD39E0BBFC0C879A55CD9E252600D" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_82D4CAF13C10B72194205CD9E2524642" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_82DF95FBBDC6DF89B6325CD9E252CB6B" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D5A332A4CC88F110C0455CD9E252DF97" xlink:to="loc_us-gaap_RangeAxis_82DF95FBBDC6DF89B6325CD9E252CB6B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_1D02560CFDFFC85485DD5CD9E252567A_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_82DF95FBBDC6DF89B6325CD9E252CB6B" xlink:to="loc_us-gaap_RangeMember_1D02560CFDFFC85485DD5CD9E252567A_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_1D02560CFDFFC85485DD5CD9E252567A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_82DF95FBBDC6DF89B6325CD9E252CB6B" xlink:to="loc_us-gaap_RangeMember_1D02560CFDFFC85485DD5CD9E252567A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_F2785497A230C6F193575CD9E252797D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_1D02560CFDFFC85485DD5CD9E252567A" xlink:to="loc_us-gaap_MinimumMember_F2785497A230C6F193575CD9E252797D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_A063C605310D55C598FF5CD9E2534434" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_1D02560CFDFFC85485DD5CD9E252567A" xlink:to="loc_us-gaap_MaximumMember_A063C605310D55C598FF5CD9E2534434" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_831F5FEBDC7AB27F36335CD9E2531873" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D5A332A4CC88F110C0455CD9E252DF97" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_831F5FEBDC7AB27F36335CD9E2531873" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_90C691924D0BF6F17B845CD9E2535593_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_831F5FEBDC7AB27F36335CD9E2531873" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_90C691924D0BF6F17B845CD9E2535593_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_90C691924D0BF6F17B845CD9E2535593" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_831F5FEBDC7AB27F36335CD9E2531873" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_90C691924D0BF6F17B845CD9E2535593" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VentureCapitalFundsMember" xlink:label="loc_us-gaap_VentureCapitalFundsMember_653B61E042FC26B4FEC95CD9E253A638" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_90C691924D0BF6F17B845CD9E2535593" xlink:to="loc_us-gaap_VentureCapitalFundsMember_653B61E042FC26B4FEC95CD9E253A638" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_00F8915FD52467B0B19B5CD9E2538F1A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_90C691924D0BF6F17B845CD9E2535593" xlink:to="loc_us-gaap_EquitySecuritiesMember_00F8915FD52467B0B19B5CD9E2538F1A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationTechniqueAxis" xlink:label="loc_us-gaap_ValuationTechniqueAxis_5DD6231D06BEB28333995CD9E2534821" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D5A332A4CC88F110C0455CD9E252DF97" xlink:to="loc_us-gaap_ValuationTechniqueAxis_5DD6231D06BEB28333995CD9E2534821" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="loc_us-gaap_ValuationTechniqueDomain_1A908D1B8E5BABBD8BF05CD9E2535C0C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_5DD6231D06BEB28333995CD9E2534821" xlink:to="loc_us-gaap_ValuationTechniqueDomain_1A908D1B8E5BABBD8BF05CD9E2535C0C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="loc_us-gaap_ValuationTechniqueDomain_1A908D1B8E5BABBD8BF05CD9E2535C0C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_5DD6231D06BEB28333995CD9E2534821" xlink:to="loc_us-gaap_ValuationTechniqueDomain_1A908D1B8E5BABBD8BF05CD9E2535C0C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MarketApproachValuationTechniqueMember" xlink:label="loc_us-gaap_MarketApproachValuationTechniqueMember_AFE5C89701BD023F41B85CD9E253ECEC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_1A908D1B8E5BABBD8BF05CD9E2535C0C" xlink:to="loc_us-gaap_MarketApproachValuationTechniqueMember_AFE5C89701BD023F41B85CD9E253ECEC" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_MarketApproachAxis" xlink:label="loc_unh_MarketApproachAxis_437D93FF0AA8ED5014415CD9E25343C7" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D5A332A4CC88F110C0455CD9E252DF97" xlink:to="loc_unh_MarketApproachAxis_437D93FF0AA8ED5014415CD9E25343C7" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_MarketApproachDomain" xlink:label="loc_unh_MarketApproachDomain_9AEDAF39D19A4D70100F5CD9E253FAFC_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_MarketApproachAxis_437D93FF0AA8ED5014415CD9E25343C7" xlink:to="loc_unh_MarketApproachDomain_9AEDAF39D19A4D70100F5CD9E253FAFC_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_MarketApproachDomain" xlink:label="loc_unh_MarketApproachDomain_9AEDAF39D19A4D70100F5CD9E253FAFC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_MarketApproachAxis_437D93FF0AA8ED5014415CD9E25343C7" xlink:to="loc_unh_MarketApproachDomain_9AEDAF39D19A4D70100F5CD9E253FAFC" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ComparableCompaniesMember" xlink:label="loc_unh_ComparableCompaniesMember_8B859EAF86BE10507EA55CD9E254DE75" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_MarketApproachDomain_9AEDAF39D19A4D70100F5CD9E253FAFC" xlink:to="loc_unh_ComparableCompaniesMember_8B859EAF86BE10507EA55CD9E254DE75" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_RecentTransactionsMember" xlink:label="loc_unh_RecentTransactionsMember_00E67EEC5C05EF2CC6005CD9E254C951" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_MarketApproachDomain_9AEDAF39D19A4D70100F5CD9E253FAFC" xlink:to="loc_unh_RecentTransactionsMember_00E67EEC5C05EF2CC6005CD9E254C951" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_94C64CEE35C851C3BAF85CD9E2540319" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_93A1DB8626376EED4FF15CD9E25435C3" xlink:to="loc_us-gaap_AvailableForSaleSecurities_94C64CEE35C851C3BAF85CD9E2540319" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple" xlink:label="loc_us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple_E005E5474D67776D212B5CD9E2545BD3" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_93A1DB8626376EED4FF15CD9E25435C3" xlink:to="loc_us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple_E005E5474D67776D212B5CD9E2545BD3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsRevenueMultiple" xlink:label="loc_us-gaap_FairValueInputsRevenueMultiple_D7C30ECEAE1EB6BA6E485CD9E254B9CF" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_93A1DB8626376EED4FF15CD9E25435C3" xlink:to="loc_us-gaap_FairValueInputsRevenueMultiple_D7C30ECEAE1EB6BA6E485CD9E254B9CF" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/FairValueFairValuePolicies" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/FairValueFinancialAssetsAndLiabilitiesExcludingAarpMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9F0CAAE4A586CBAA26F90297A97C9229" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9F0CAAE4A586CBAA26F90297A97C9229" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_90DD125261621A52CC880297A97CEA22" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9F0CAAE4A586CBAA26F90297A97C9229" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_90DD125261621A52CC880297A97CEA22" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DE9EA2969E29A7BCFA2F0297A97C095A_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_90DD125261621A52CC880297A97CEA22" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DE9EA2969E29A7BCFA2F0297A97C095A_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DE9EA2969E29A7BCFA2F0297A97C095A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_90DD125261621A52CC880297A97CEA22" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DE9EA2969E29A7BCFA2F0297A97C095A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_66471F2D491CD82139180297A97C659E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DE9EA2969E29A7BCFA2F0297A97C095A" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_66471F2D491CD82139180297A97C659E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_8D93362137C3896570EB0297A97D3D8E" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DE9EA2969E29A7BCFA2F0297A97C095A" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_8D93362137C3896570EB0297A97D3D8E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_5C4EDDE48F3D93DA06470297A97D9D78" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DE9EA2969E29A7BCFA2F0297A97C095A" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_5C4EDDE48F3D93DA06470297A97D9D78" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_7DEECFF442E5CD53930A0297A97D1202" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9F0CAAE4A586CBAA26F90297A97C9229" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_7DEECFF442E5CD53930A0297A97D1202" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_263BA2F531BC3D1D1BF70297A97D75D3_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_7DEECFF442E5CD53930A0297A97D1202" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_263BA2F531BC3D1D1BF70297A97D75D3_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_263BA2F531BC3D1D1BF70297A97D75D3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_7DEECFF442E5CD53930A0297A97D1202" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_263BA2F531BC3D1D1BF70297A97D75D3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_BAE9D260F7352BBB600C0297A97DDE65" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_263BA2F531BC3D1D1BF70297A97D75D3" xlink:to="loc_us-gaap_DebtSecuritiesMember_BAE9D260F7352BBB600C0297A97DDE65" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USTreasuryAndGovernmentMember" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_F46B6B07F5CDC89482990297A97D67D9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_BAE9D260F7352BBB600C0297A97DDE65" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_F46B6B07F5CDC89482990297A97D67D9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_8791A2F246FB11E3382D0297A97D1391" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_BAE9D260F7352BBB600C0297A97DDE65" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_8791A2F246FB11E3382D0297A97D1391" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_BE4641B1692FE3F15A100297A97D9FDD" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_BAE9D260F7352BBB600C0297A97DDE65" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_BE4641B1692FE3F15A100297A97D9FDD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_074C0D2F3695D9B7EED90297A97DF152" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_BAE9D260F7352BBB600C0297A97DDE65" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_074C0D2F3695D9B7EED90297A97DF152" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_3A974BAC8F51152EECD20297A97DCB72" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_BAE9D260F7352BBB600C0297A97DDE65" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_3A974BAC8F51152EECD20297A97DCB72" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_DFFF70000D4A1F2A6E7F0297A97E7881" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_DFFF70000D4A1F2A6E7F0297A97E7881" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_638DBAA7D7990203ECB90297A97EEBE5" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_638DBAA7D7990203ECB90297A97EEBE5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesEquitySecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesEquitySecurities_F7755FFA0A77F999141F0297A97E2BE5" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesEquitySecurities_F7755FFA0A77F999141F0297A97E2BE5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateDerivativeAssetsAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_1C1219BAFA0C1BEA29230297A97EAB5D" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:to="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_1C1219BAFA0C1BEA29230297A97EAB5D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsFairValueDisclosureRecurring" xlink:label="loc_us-gaap_AssetsFairValueDisclosureRecurring_0F82C7E4D977008932780297A97E3D2F" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:to="loc_us-gaap_AssetsFairValueDisclosureRecurring_0F82C7E4D977008932780297A97E3D2F" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AssetsMeasuredatFairValueonaRecurringBasisasaPercentageofTotalAssetsatFairValue" xlink:label="loc_unh_AssetsMeasuredatFairValueonaRecurringBasisasaPercentageofTotalAssetsatFairValue_1702B65474347442683C0297A97E2BF6" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:to="loc_unh_AssetsMeasuredatFairValueonaRecurringBasisasaPercentageofTotalAssetsatFairValue_1702B65474347442683C0297A97E2BF6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_346F0795CC59681691C60297A97EC73E" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:to="loc_us-gaap_DerivativeLiabilities_346F0795CC59681691C60297A97EC73E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateDerivativeLiabilitiesAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeLiabilitiesAtFairValue_1CBC32384E5EA048B9210297A97E8E5E" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E1E964434215A72BDBCB0297A97EC4E6" xlink:to="loc_us-gaap_InterestRateDerivativeLiabilitiesAtFairValue_1CBC32384E5EA048B9210297A97E8E5E" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/FairValueFinancialAssetsAndLiabilitiesExcludingAarpNotMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_EF5E9D512667E57404A2FEA7B753B3F4" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_49E01DF5332E43E8A9D4FEA7B74B5A28" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_EF5E9D512667E57404A2FEA7B753B3F4" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_49E01DF5332E43E8A9D4FEA7B74B5A28" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_22DB6047884699FBFEF0FEA7B74C62AD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_49E01DF5332E43E8A9D4FEA7B74B5A28" xlink:to="loc_us-gaap_DebtInstrumentAxis_22DB6047884699FBFEF0FEA7B74C62AD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4ED2A3D9179334173DEBFEA7B74C37BE_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_22DB6047884699FBFEF0FEA7B74C62AD" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4ED2A3D9179334173DEBFEA7B74C37BE_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4ED2A3D9179334173DEBFEA7B74C37BE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_22DB6047884699FBFEF0FEA7B74C62AD" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4ED2A3D9179334173DEBFEA7B74C37BE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_6C2CDB18C683F29A3BFEFEA7B74C7D6A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4ED2A3D9179334173DEBFEA7B74C37BE" xlink:to="loc_us-gaap_SeniorNotesMember_6C2CDB18C683F29A3BFEFEA7B74C7D6A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtSecurityAxis" xlink:label="loc_us-gaap_DebtSecurityAxis_898681416FC8F219E6FDFEA7B751B348" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_49E01DF5332E43E8A9D4FEA7B74B5A28" xlink:to="loc_us-gaap_DebtSecurityAxis_898681416FC8F219E6FDFEA7B751B348" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_4E0DCAEBE1F2D9717CCAFEA7B7516BEF_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtSecurityAxis_898681416FC8F219E6FDFEA7B751B348" xlink:to="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_4E0DCAEBE1F2D9717CCAFEA7B7516BEF_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_4E0DCAEBE1F2D9717CCAFEA7B7516BEF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtSecurityAxis_898681416FC8F219E6FDFEA7B751B348" xlink:to="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_4E0DCAEBE1F2D9717CCAFEA7B7516BEF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USTreasuryAndGovernmentMember" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_EE5C62CF5161059DADEEFEA7B751E21E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_4E0DCAEBE1F2D9717CCAFEA7B7516BEF" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_EE5C62CF5161059DADEEFEA7B751E21E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_D958BBBD72B1751FF22FFEA7B751CFF9" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_4E0DCAEBE1F2D9717CCAFEA7B7516BEF" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_D958BBBD72B1751FF22FFEA7B751CFF9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_CC48BC83BE2CD8F7A17AFEA7B7516070" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_4E0DCAEBE1F2D9717CCAFEA7B7516BEF" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_CC48BC83BE2CD8F7A17AFEA7B7516070" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_461DEDF6489AF3C1CABFFEA7B7512CA1" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_4E0DCAEBE1F2D9717CCAFEA7B7516BEF" xlink:to="loc_us-gaap_DebtSecuritiesMember_461DEDF6489AF3C1CABFFEA7B7512CA1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8F2F9E1704138BE65CF8FEA7B751EF2A" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_49E01DF5332E43E8A9D4FEA7B74B5A28" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8F2F9E1704138BE65CF8FEA7B751EF2A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC92D08C7FA3618CFE9BFEA7B7523C5E_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8F2F9E1704138BE65CF8FEA7B751EF2A" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC92D08C7FA3618CFE9BFEA7B7523C5E_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC92D08C7FA3618CFE9BFEA7B7523C5E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8F2F9E1704138BE65CF8FEA7B751EF2A" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC92D08C7FA3618CFE9BFEA7B7523C5E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsNonrecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_19154F778DFE6E17BA1CFEA7B75247C3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC92D08C7FA3618CFE9BFEA7B7523C5E" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_19154F778DFE6E17BA1CFEA7B75247C3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_8ABF0AAE1EE6DCBB56E3FEA7B7524F70" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_DC92D08C7FA3618CFE9BFEA7B7523C5E" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_8ABF0AAE1EE6DCBB56E3FEA7B7524F70" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6C691272324D0F7EB0D2FEA7B7528796" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_49E01DF5332E43E8A9D4FEA7B74B5A28" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6C691272324D0F7EB0D2FEA7B7528796" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_48DCF9E0B5096B721F58FEA7B7525E34_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6C691272324D0F7EB0D2FEA7B7528796" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_48DCF9E0B5096B721F58FEA7B7525E34_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_48DCF9E0B5096B721F58FEA7B7525E34" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6C691272324D0F7EB0D2FEA7B7528796" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_48DCF9E0B5096B721F58FEA7B7525E34" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_727CAA66806CF16E3CECFEA7B7524F3A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_48DCF9E0B5096B721F58FEA7B7525E34" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_727CAA66806CF16E3CECFEA7B7524F3A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_D56E72EE8F50FCE853AFFEA7B7526EC8" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_48DCF9E0B5096B721F58FEA7B7525E34" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_D56E72EE8F50FCE853AFFEA7B7526EC8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_725FBF22153ED286F3B6FEA7B752E5FC" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_48DCF9E0B5096B721F58FEA7B7525E34" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_725FBF22153ED286F3B6FEA7B752E5FC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecurities" xlink:label="loc_us-gaap_HeldToMaturitySecurities_09D40EA998D931B203E5FEA7B7530E49" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EF5E9D512667E57404A2FEA7B753B3F4" xlink:to="loc_us-gaap_HeldToMaturitySecurities_09D40EA998D931B203E5FEA7B7530E49" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentFairValue" xlink:label="loc_us-gaap_DebtInstrumentFairValue_7D63F7D64557BE770281FEA7B7539CED" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EF5E9D512667E57404A2FEA7B753B3F4" xlink:to="loc_us-gaap_DebtInstrumentFairValue_7D63F7D64557BE770281FEA7B7539CED" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/FairValueNarrativeDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_6AF7E387106C181191C8226DE40A4CCD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_6AF7E387106C181191C8226DE40A4CCD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3E49279E14F1A8EBCBDA226DE40A65EC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_6AF7E387106C181191C8226DE40A4CCD" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3E49279E14F1A8EBCBDA226DE40A65EC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_C91EC538DFA4D48605B6226DE40A84B6_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3E49279E14F1A8EBCBDA226DE40A65EC" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_C91EC538DFA4D48605B6226DE40A84B6_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_C91EC538DFA4D48605B6226DE40A84B6" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3E49279E14F1A8EBCBDA226DE40A65EC" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_C91EC538DFA4D48605B6226DE40A84B6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsNonrecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_67999C233EA1164EDD3B226DE40B64BF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_C91EC538DFA4D48605B6226DE40A84B6" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_67999C233EA1164EDD3B226DE40B64BF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_BD2E2847BF7F76C47430226DE40B5D4F" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_C91EC538DFA4D48605B6226DE40A84B6" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_BD2E2847BF7F76C47430226DE40B5D4F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_7D52A795D28262744DAE226DE40B7896" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_6AF7E387106C181191C8226DE40A4CCD" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_7D52A795D28262744DAE226DE40B7896" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_57541B9011F1F3CE5510226DE40B3744_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_7D52A795D28262744DAE226DE40B7896" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_57541B9011F1F3CE5510226DE40B3744_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_57541B9011F1F3CE5510226DE40B3744" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_7D52A795D28262744DAE226DE40B7896" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_57541B9011F1F3CE5510226DE40B3744" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_1DFB62764C4CFDB89734226DE40BCB7A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_57541B9011F1F3CE5510226DE40B3744" xlink:to="loc_us-gaap_DebtSecuritiesMember_1DFB62764C4CFDB89734226DE40BCB7A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7024A321DB05DDA1385E226DE40B5C34" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_6AF7E387106C181191C8226DE40A4CCD" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7024A321DB05DDA1385E226DE40B5C34" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E53E8C44E58735C9F3FF226DE40BB833_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7024A321DB05DDA1385E226DE40B5C34" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E53E8C44E58735C9F3FF226DE40BB833_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E53E8C44E58735C9F3FF226DE40BB833" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7024A321DB05DDA1385E226DE40B5C34" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E53E8C44E58735C9F3FF226DE40BB833" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_9C663414D8D78C9A79FD226DE40B4FBF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E53E8C44E58735C9F3FF226DE40BB833" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_9C663414D8D78C9A79FD226DE40B4FBF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_B2CAF9CDD4495BE3FDC8226DE40BF9DF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:to="loc_us-gaap_AvailableForSaleSecurities_B2CAF9CDD4495BE3FDC8226DE40BF9DF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount" xlink:label="loc_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_713A199AE5BB33F7934A226DE40C1C0E" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:to="loc_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_713A199AE5BB33F7934A226DE40C1C0E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount" xlink:label="loc_us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount_D328B830323F051EC9A8226DE40C3842" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:to="loc_us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount_D328B830323F051EC9A8226DE40C3842" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount" xlink:label="loc_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_F86D289FACFF0458B98A226DE40C6E78" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:to="loc_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_F86D289FACFF0458B98A226DE40C6E78" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount" xlink:label="loc_us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount_01F9EFAD7EB2BB692E0B226DE40CD7B0" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:to="loc_us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount_01F9EFAD7EB2BB692E0B226DE40CD7B0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_68DC64CD01B41FA9CE23226DE40CDC1E" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_68DC64CD01B41FA9CE23226DE40CDC1E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_3466BD388733A914C5A7226DE40C345D" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_3466BD388733A914C5A7226DE40C345D" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_FairValueAdjustmentsForAssetsAndLiabilitiesMeasuredAtFairValueOnNonRecurringBasis" xlink:label="loc_unh_FairValueAdjustmentsForAssetsAndLiabilitiesMeasuredAtFairValueOnNonRecurringBasis_BBF4B74C4791B9BA3828226DE40CED39" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EAA35F725B7541EF3910226DE40B1658" xlink:to="loc_unh_FairValueAdjustmentsForAssetsAndLiabilitiesMeasuredAtFairValueOnNonRecurringBasis_BBF4B74C4791B9BA3828226DE40CED39" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/FairValueReconciliationOfAssetsMeasuredAtFairValueOnRecurringBasisUsingLevel3InputsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_8079ADAF4BFECD38C188226DE3BE8765" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6D84A8DE36D2FF5EE4DA226DE3BDA9CB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_8079ADAF4BFECD38C188226DE3BE8765" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6D84A8DE36D2FF5EE4DA226DE3BDA9CB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_5F278209DABE888E0399226DE3BD30BE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6D84A8DE36D2FF5EE4DA226DE3BDA9CB" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_5F278209DABE888E0399226DE3BD30BE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_5B0C23FD1522EB98AA9F226DE3BD74C0_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_5F278209DABE888E0399226DE3BD30BE" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_5B0C23FD1522EB98AA9F226DE3BD74C0_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_5B0C23FD1522EB98AA9F226DE3BD74C0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_5F278209DABE888E0399226DE3BD30BE" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_5B0C23FD1522EB98AA9F226DE3BD74C0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_5C681F1A8687564E9923226DE3BDD73D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_5B0C23FD1522EB98AA9F226DE3BD74C0" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_5C681F1A8687564E9923226DE3BDD73D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_C6E54AF9ECA6F3777029226DE3BD44FC" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6D84A8DE36D2FF5EE4DA226DE3BDA9CB" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_C6E54AF9ECA6F3777029226DE3BD44FC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_744BF7101FA687629CE9226DE3BD3536_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_C6E54AF9ECA6F3777029226DE3BD44FC" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_744BF7101FA687629CE9226DE3BD3536_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_744BF7101FA687629CE9226DE3BD3536" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_C6E54AF9ECA6F3777029226DE3BD44FC" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_744BF7101FA687629CE9226DE3BD3536" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_99D6CE8C83D00FA67A71226DE3BE12F6" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_744BF7101FA687629CE9226DE3BD3536" xlink:to="loc_us-gaap_DebtSecuritiesMember_99D6CE8C83D00FA67A71226DE3BE12F6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_10EF908F56C3EEC2204C226DE3BE7C78" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_744BF7101FA687629CE9226DE3BD3536" xlink:to="loc_us-gaap_EquitySecuritiesMember_10EF908F56C3EEC2204C226DE3BE7C78" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_80FF39B134264009A6A4226DE3BEFE09" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8079ADAF4BFECD38C188226DE3BE8765" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_80FF39B134264009A6A4226DE3BEFE09" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_7EEF126FCEDD83644ECF226DE3BE0B61" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_80FF39B134264009A6A4226DE3BEFE09" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_7EEF126FCEDD83644ECF226DE3BE0B61" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_65371E33471C926AA702226DE3BE0C1E" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_80FF39B134264009A6A4226DE3BEFE09" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_65371E33471C926AA702226DE3BE0C1E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_A07E3B4FDA377AABC6B3226DE3BE1394" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_80FF39B134264009A6A4226DE3BEFE09" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_A07E3B4FDA377AABC6B3226DE3BE1394" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_9DDDF5A1C8BE38E0A6DA226DE3BEA400" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_80FF39B134264009A6A4226DE3BEFE09" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_9DDDF5A1C8BE38E0A6DA226DE3BEA400" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_75C6A8DC517A3F3FB7AB226DE3BE49D6" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_80FF39B134264009A6A4226DE3BEFE09" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_75C6A8DC517A3F3FB7AB226DE3BE49D6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_E24F65D29A0489C5AC20226DE3BF2F5D" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_80FF39B134264009A6A4226DE3BEFE09" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_E24F65D29A0489C5AC20226DE3BF2F5D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_BBA799248C1CC9056194226DE3C44647" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_80FF39B134264009A6A4226DE3BEFE09" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_BBA799248C1CC9056194226DE3C44647" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/FairValueTables" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C16EB399E373B9A12E285CD9E2D77DD1" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_36823C689507A2BAD2575CD9E2D7B815" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C16EB399E373B9A12E285CD9E2D77DD1" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_36823C689507A2BAD2575CD9E2D7B815" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_FB2B7B2A67C099F4F84E5CD9E2D74BF7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_36823C689507A2BAD2575CD9E2D7B815" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_FB2B7B2A67C099F4F84E5CD9E2D74BF7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_0F0F9C20DB817C22FF035CD9E2D7A3CE_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_FB2B7B2A67C099F4F84E5CD9E2D74BF7" xlink:to="loc_us-gaap_SegmentDomain_0F0F9C20DB817C22FF035CD9E2D7A3CE_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_0F0F9C20DB817C22FF035CD9E2D7A3CE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_FB2B7B2A67C099F4F84E5CD9E2D74BF7" xlink:to="loc_us-gaap_SegmentDomain_0F0F9C20DB817C22FF035CD9E2D7A3CE" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AarpProgramMember" xlink:label="loc_unh_AarpProgramMember_9E1D76260A6C69078D7D5CD9E2D79E9D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0F0F9C20DB817C22FF035CD9E2D7A3CE" xlink:to="loc_unh_AarpProgramMember_9E1D76260A6C69078D7D5CD9E2D79E9D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_F7520A1926403BA7D4505CD9E2D81E3E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C16EB399E373B9A12E285CD9E2D77DD1" xlink:to="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_F7520A1926403BA7D4505CD9E2D81E3E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisTextBlock" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisTextBlock_FE86632888DFACB4ABFA5CD9E2D871DA" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C16EB399E373B9A12E285CD9E2D77DD1" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisTextBlock_FE86632888DFACB4ABFA5CD9E2D871DA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_91C1C4663CFFDB13C1D05CD9E2D87C93" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C16EB399E373B9A12E285CD9E2D77DD1" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_91C1C4663CFFDB13C1D05CD9E2D87C93" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsAssetsQuantitativeInformationTableTextBlock" xlink:label="loc_us-gaap_FairValueInputsAssetsQuantitativeInformationTableTextBlock_49C2573EC185C604684E5CD9E2D896B1" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_C16EB399E373B9A12E285CD9E2D77DD1" xlink:to="loc_us-gaap_FairValueInputsAssetsQuantitativeInformationTableTextBlock_49C2573EC185C604684E5CD9E2D896B1" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/GoodwillAndIntangibleAssetsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_61A9A1B3853A14EFBAC9081FC718C3C1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_61A9A1B3853A14EFBAC9081FC718C3C1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="unh-20131231.xsd#unh_StepAcquisitionAxis" xlink:label="loc_unh_StepAcquisitionAxis_FC64785380555EBE3B7B08A85FB43E9E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_61A9A1B3853A14EFBAC9081FC718C3C1" xlink:to="loc_unh_StepAcquisitionAxis_FC64785380555EBE3B7B08A85FB43E9E" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_StepAcquisitionDomain" xlink:label="loc_unh_StepAcquisitionDomain_0C00B5C913575BD4028408A85FB95BD4_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_StepAcquisitionAxis_FC64785380555EBE3B7B08A85FB43E9E" xlink:to="loc_unh_StepAcquisitionDomain_0C00B5C913575BD4028408A85FB95BD4_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_StepAcquisitionDomain" xlink:label="loc_unh_StepAcquisitionDomain_0C00B5C913575BD4028408A85FB95BD4" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_StepAcquisitionAxis_FC64785380555EBE3B7B08A85FB43E9E" xlink:to="loc_unh_StepAcquisitionDomain_0C00B5C913575BD4028408A85FB95BD4" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_StepFourMember" xlink:label="loc_unh_StepFourMember_71DF4779432598A168CD08A861803783" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_StepAcquisitionDomain_0C00B5C913575BD4028408A85FB95BD4" xlink:to="loc_unh_StepFourMember_71DF4779432598A168CD08A861803783" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_62F2C4F84CCA3A54C080081FC718E611" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_61A9A1B3853A14EFBAC9081FC718C3C1" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_62F2C4F84CCA3A54C080081FC718E611" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0E2E841D9A888E159BAF081FC71865AC_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_62F2C4F84CCA3A54C080081FC718E611" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0E2E841D9A888E159BAF081FC71865AC_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0E2E841D9A888E159BAF081FC71865AC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_62F2C4F84CCA3A54C080081FC718E611" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0E2E841D9A888E159BAF081FC71865AC" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AmilParticipacoesSAMember" xlink:label="loc_unh_AmilParticipacoesSAMember_00AA45BE2336E1A3217B081FC7193559" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0E2E841D9A888E159BAF081FC71865AC" xlink:to="loc_unh_AmilParticipacoesSAMember_00AA45BE2336E1A3217B081FC7193559" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ExcludingAmilParticipacoesS.A.Member" xlink:label="loc_unh_ExcludingAmilParticipacoesS.A.Member_1CB336F247AE14AEC5F9081FC7191E14" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0E2E841D9A888E159BAF081FC71865AC" xlink:to="loc_unh_ExcludingAmilParticipacoesS.A.Member_1CB336F247AE14AEC5F9081FC7191E14" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_People" xlink:label="loc_unh_People_EF5B0928878DCC361425081FC719B625" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_unh_People_EF5B0928878DCC361425081FC719B625" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_BusinessCombinationConsiderationPaidinExcessoftheFairValueofNetTangibleAssets" xlink:label="loc_unh_BusinessCombinationConsiderationPaidinExcessoftheFairValueofNetTangibleAssets_21C5C789F75F366246A8081FCD45F699" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_unh_BusinessCombinationConsiderationPaidinExcessoftheFairValueofNetTangibleAssets_21C5C789F75F366246A8081FCD45F699" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_9156B49DE7C8849EC9AE081FC719F758" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_9156B49DE7C8849EC9AE081FC719F758" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IndefinitelivedIntangibleAssetsAcquired" xlink:label="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_5BA7DBC88E1F4776EE7B081FC7191F04" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_5BA7DBC88E1F4776EE7B081FC7191F04" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_CBB31CA92B2B89C98C6F081FC7193423" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_CBB31CA92B2B89C98C6F081FC7193423" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_14A75A203D54B303C64F081FC71944FC" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_14A75A203D54B303C64F081FC71944FC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_21D5A1088FFD0E300BE3081FC71A532C" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_21D5A1088FFD0E300BE3081FC71A532C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_E320A64AB9B66AE2CDD0081FC71A841E" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_E320A64AB9B66AE2CDD0081FC71A841E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_7F36C5B65F9CBD0E62B4098BCD003A1E" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_7F36C5B65F9CBD0E62B4098BCD003A1E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_E116324C0B3A418AF38D081FC71A75C6" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_E116324C0B3A418AF38D081FC71A75C6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueOther" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueOther_1F4078CB536971E2C328081FC71AAFE6" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueOther_1F4078CB536971E2C328081FC71AAFE6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_E877CFF39747B571D5E7081FC71A75C1" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_E877CFF39747B571D5E7081FC71A75C1" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CommitmenttoRetainSharesYearFour" xlink:label="loc_unh_CommitmenttoRetainSharesYearFour_F04D6BF6F7359381A81C081FC71AAF1E" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_unh_CommitmenttoRetainSharesYearFour_F04D6BF6F7359381A81C081FC71AAF1E" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CompanyRighttoCallSharesYearFour" xlink:label="loc_unh_CompanyRighttoCallSharesYearFour_4E814230B2CDD3035669081FC71A791E" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_unh_CompanyRighttoCallSharesYearFour_4E814230B2CDD3035669081FC71A791E" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ShareholdersRighttoPutinYearFour" xlink:label="loc_unh_ShareholdersRighttoPutinYearFour_88840E4083D6555D3CCF081FC71A7D33" xlink:type="locator"/>
<definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_unh_ShareholdersRighttoPutinYearFour_88840E4083D6555D3CCF081FC71A7D33" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CommitmenttoHoldSharesYearFour" xlink:label="loc_unh_CommitmenttoHoldSharesYearFour_E5CCDF88674E1FEAEA2F081FC71A17D1" xlink:type="locator"/>
<definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_6C8E53956C5200125290081FC7190182" xlink:to="loc_unh_CommitmenttoHoldSharesYearFour_E5CCDF88674E1FEAEA2F081FC71A17D1" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsAmortizationExpenseRelatingToIntangibleAssetsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_B93CEE93A3A94C07E35F0874A6D8CCAC" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_87AD022D0FD721BE697A0874A6D77BA3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_B93CEE93A3A94C07E35F0874A6D8CCAC" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_87AD022D0FD721BE697A0874A6D77BA3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7891A2B8E2C6C7262A020874A6D74FB3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_87AD022D0FD721BE697A0874A6D77BA3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7891A2B8E2C6C7262A020874A6D74FB3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7DF764B5F453F76A1C840874A6D7C180_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7891A2B8E2C6C7262A020874A6D74FB3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7DF764B5F453F76A1C840874A6D7C180_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7DF764B5F453F76A1C840874A6D7C180" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7891A2B8E2C6C7262A020874A6D74FB3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7DF764B5F453F76A1C840874A6D7C180" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="loc_us-gaap_ConsolidationItemsAxis_B2DF3DABA7822045D0FF0874A6D7D161" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_87AD022D0FD721BE697A0874A6D77BA3" xlink:to="loc_us-gaap_ConsolidationItemsAxis_B2DF3DABA7822045D0FF0874A6D7D161" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_12B36D6AB566BFB9032F0874A6D83C58_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConsolidationItemsAxis_B2DF3DABA7822045D0FF0874A6D7D161" xlink:to="loc_us-gaap_ConsolidationItemsDomain_12B36D6AB566BFB9032F0874A6D83C58_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_12B36D6AB566BFB9032F0874A6D83C58" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConsolidationItemsAxis_B2DF3DABA7822045D0FF0874A6D7D161" xlink:to="loc_us-gaap_ConsolidationItemsDomain_12B36D6AB566BFB9032F0874A6D83C58" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_627B7181B622D3C56A8A0874A6D8B67E" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_87AD022D0FD721BE697A0874A6D77BA3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_627B7181B622D3C56A8A0874A6D8B67E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_22616FFD086729E06FE90874A6D82212_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_627B7181B622D3C56A8A0874A6D8B67E" xlink:to="loc_us-gaap_SegmentDomain_22616FFD086729E06FE90874A6D82212_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_22616FFD086729E06FE90874A6D82212" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_627B7181B622D3C56A8A0874A6D8B67E" xlink:to="loc_us-gaap_SegmentDomain_22616FFD086729E06FE90874A6D82212" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_BF5FB6353EC199E0816B0874A6D8956E" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_87AD022D0FD721BE697A0874A6D77BA3" xlink:to="loc_us-gaap_RangeAxis_BF5FB6353EC199E0816B0874A6D8956E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_CA5A4E12795F4E4224AB0874A6D867D3_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_BF5FB6353EC199E0816B0874A6D8956E" xlink:to="loc_us-gaap_RangeMember_CA5A4E12795F4E4224AB0874A6D867D3_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_CA5A4E12795F4E4224AB0874A6D867D3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_BF5FB6353EC199E0816B0874A6D8956E" xlink:to="loc_us-gaap_RangeMember_CA5A4E12795F4E4224AB0874A6D867D3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_4D50922D159A285F9ACC0874A6D86936" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_B93CEE93A3A94C07E35F0874A6D8CCAC" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_4D50922D159A285F9ACC0874A6D86936" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_5F6FB3E4C56671D9DDED0874A6DDEFC4" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_B93CEE93A3A94C07E35F0874A6D8CCAC" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_5F6FB3E4C56671D9DDED0874A6DDEFC4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_4D00CEC8B45C3DB2CA760874A6DD5B72" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_B93CEE93A3A94C07E35F0874A6D8CCAC" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_4D00CEC8B45C3DB2CA760874A6DD5B72" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_0A5FB7ACD1C949B11D7B0874A6DDE3D5" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_B93CEE93A3A94C07E35F0874A6D8CCAC" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_0A5FB7ACD1C949B11D7B0874A6DDE3D5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_0BE7A45914ACC37B79420874A6DE7766" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_B93CEE93A3A94C07E35F0874A6D8CCAC" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_0BE7A45914ACC37B79420874A6DE7766" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsChangesInCarryingAmountOfGoodwillByReportingSegmentDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_99499B52201D36AE8BAB0874A72FCC52" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_52F7EB2EEB04CBCE9AB50874A728B6D3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_99499B52201D36AE8BAB0874A72FCC52" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_52F7EB2EEB04CBCE9AB50874A728B6D3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="loc_us-gaap_ConsolidationItemsAxis_44FF4185921CBC9102370874A7289B14" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_52F7EB2EEB04CBCE9AB50874A728B6D3" xlink:to="loc_us-gaap_ConsolidationItemsAxis_44FF4185921CBC9102370874A7289B14" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_08ED05BB25E3318E90000874A7292695_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConsolidationItemsAxis_44FF4185921CBC9102370874A7289B14" xlink:to="loc_us-gaap_ConsolidationItemsDomain_08ED05BB25E3318E90000874A7292695_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_08ED05BB25E3318E90000874A7292695" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConsolidationItemsAxis_44FF4185921CBC9102370874A7289B14" xlink:to="loc_us-gaap_ConsolidationItemsDomain_08ED05BB25E3318E90000874A7292695" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3C0425C2D68408E0F4260874A7293624" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_52F7EB2EEB04CBCE9AB50874A728B6D3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3C0425C2D68408E0F4260874A7293624" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_B2207A6D3244C14643380874A729EAA1_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3C0425C2D68408E0F4260874A7293624" xlink:to="loc_us-gaap_SegmentDomain_B2207A6D3244C14643380874A729EAA1_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_B2207A6D3244C14643380874A729EAA1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3C0425C2D68408E0F4260874A7293624" xlink:to="loc_us-gaap_SegmentDomain_B2207A6D3244C14643380874A729EAA1" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_UnitedhealthcareMember" xlink:label="loc_unh_UnitedhealthcareMember_11AF434F6D1F5CBD88C00874A72920B5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_B2207A6D3244C14643380874A729EAA1" xlink:to="loc_unh_UnitedhealthcareMember_11AF434F6D1F5CBD88C00874A72920B5" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_OptumhealthMember" xlink:label="loc_unh_OptumhealthMember_2015930368671B8EB93B0874A729A16F" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_B2207A6D3244C14643380874A729EAA1" xlink:to="loc_unh_OptumhealthMember_2015930368671B8EB93B0874A729A16F" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_OptuminsightMember" xlink:label="loc_unh_OptuminsightMember_EDCDEE163AB07CB3D41C0874A729B501" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_B2207A6D3244C14643380874A729EAA1" xlink:to="loc_unh_OptuminsightMember_EDCDEE163AB07CB3D41C0874A729B501" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_OptumrxMember" xlink:label="loc_unh_OptumrxMember_F0A2070D6CB31A680C600874A7296D7B" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_B2207A6D3244C14643380874A729EAA1" xlink:to="loc_unh_OptumrxMember_F0A2070D6CB31A680C600874A7296D7B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_5E58B1E8E280046DEF830874A72FB6F4" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_52F7EB2EEB04CBCE9AB50874A728B6D3" xlink:to="loc_us-gaap_RangeAxis_5E58B1E8E280046DEF830874A72FB6F4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A902D4E5C3C99E9E13790874A72FD489_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_5E58B1E8E280046DEF830874A72FB6F4" xlink:to="loc_us-gaap_RangeMember_A902D4E5C3C99E9E13790874A72FD489_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A902D4E5C3C99E9E13790874A72FD489" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_5E58B1E8E280046DEF830874A72FB6F4" xlink:to="loc_us-gaap_RangeMember_A902D4E5C3C99E9E13790874A72FD489" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_BA39D506D9B29FC4FD410874A72F85C9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_99499B52201D36AE8BAB0874A72FCC52" xlink:to="loc_us-gaap_Goodwill_BA39D506D9B29FC4FD410874A72F85C9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_05B0B73DE7C781F02F5E0874A72F0A6D" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_99499B52201D36AE8BAB0874A72FCC52" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_05B0B73DE7C781F02F5E0874A72F0A6D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_487967528C21DCB7AE890874A72F3F1B" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_99499B52201D36AE8BAB0874A72FCC52" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_487967528C21DCB7AE890874A72F3F1B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments_EA4D79591DC040A44A7E0874A72FBDA7" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_99499B52201D36AE8BAB0874A72FCC52" xlink:to="loc_us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments_EA4D79591DC040A44A7E0874A72FBDA7" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsGrossCarryingValueAccumulatedAmortizationAndNetCarryingValueOfIntangibleAssetsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_251F2CE17D8B86C17AFFFEA7B66ACC22" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_1173D570CE0B27B1AF35FEA7B6684EDD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_251F2CE17D8B86C17AFFFEA7B66ACC22" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_1173D570CE0B27B1AF35FEA7B6684EDD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_4F8B7D7FCBC85934D476FEA7B668BF62" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_1173D570CE0B27B1AF35FEA7B6684EDD" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_4F8B7D7FCBC85934D476FEA7B668BF62" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E664A3A90E5CF8E77585FEA7B66819C2_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_4F8B7D7FCBC85934D476FEA7B668BF62" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E664A3A90E5CF8E77585FEA7B66819C2_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E664A3A90E5CF8E77585FEA7B66819C2" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_4F8B7D7FCBC85934D476FEA7B668BF62" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E664A3A90E5CF8E77585FEA7B66819C2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_7ED1BB6D1587D97195C4FEA7B66824FD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E664A3A90E5CF8E77585FEA7B66819C2" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_7ED1BB6D1587D97195C4FEA7B66824FD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5258E4F58D28B1DA1C38FEA7B66926B7" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_1173D570CE0B27B1AF35FEA7B6684EDD" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5258E4F58D28B1DA1C38FEA7B66926B7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E4E28D220C85E979F13FEA7B669AB2E_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5258E4F58D28B1DA1C38FEA7B66926B7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E4E28D220C85E979F13FEA7B669AB2E_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E4E28D220C85E979F13FEA7B669AB2E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5258E4F58D28B1DA1C38FEA7B66926B7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E4E28D220C85E979F13FEA7B669AB2E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_D5B9C4AE26D3DBB9F77AFEA7B669639F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E4E28D220C85E979F13FEA7B669AB2E" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_D5B9C4AE26D3DBB9F77AFEA7B669639F" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TrademarksandTechnologyMember" xlink:label="loc_unh_TrademarksandTechnologyMember_6846F9C8FACDB45837DBFEA7B66958B6" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E4E28D220C85E979F13FEA7B669AB2E" xlink:to="loc_unh_TrademarksandTechnologyMember_6846F9C8FACDB45837DBFEA7B66958B6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_60626DE4CDF69C2C20B2FEA7B6698AF0" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E4E28D220C85E979F13FEA7B669AB2E" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_60626DE4CDF69C2C20B2FEA7B6698AF0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="loc_us-gaap_ConsolidationItemsAxis_F70D547386825599BAD7FEA7B669F325" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_1173D570CE0B27B1AF35FEA7B6684EDD" xlink:to="loc_us-gaap_ConsolidationItemsAxis_F70D547386825599BAD7FEA7B669F325" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_2606BCBE5C38F84EF8EAFEA7B669D1B9_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConsolidationItemsAxis_F70D547386825599BAD7FEA7B669F325" xlink:to="loc_us-gaap_ConsolidationItemsDomain_2606BCBE5C38F84EF8EAFEA7B669D1B9_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_2606BCBE5C38F84EF8EAFEA7B669D1B9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConsolidationItemsAxis_F70D547386825599BAD7FEA7B669F325" xlink:to="loc_us-gaap_ConsolidationItemsDomain_2606BCBE5C38F84EF8EAFEA7B669D1B9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3D908E80E75112B6CFE0FEA7B6694953" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_1173D570CE0B27B1AF35FEA7B6684EDD" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3D908E80E75112B6CFE0FEA7B6694953" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_7D1A44F5530527D378EBFEA7B669074A_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3D908E80E75112B6CFE0FEA7B6694953" xlink:to="loc_us-gaap_SegmentDomain_7D1A44F5530527D378EBFEA7B669074A_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_7D1A44F5530527D378EBFEA7B669074A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3D908E80E75112B6CFE0FEA7B6694953" xlink:to="loc_us-gaap_SegmentDomain_7D1A44F5530527D378EBFEA7B669074A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_22E190D3BBFF31547BF4FEA7B66ABB0A" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_1173D570CE0B27B1AF35FEA7B6684EDD" xlink:to="loc_us-gaap_RangeAxis_22E190D3BBFF31547BF4FEA7B66ABB0A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_BC203DB4DCBA7276E4F8FEA7B66A9F83_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_22E190D3BBFF31547BF4FEA7B66ABB0A" xlink:to="loc_us-gaap_RangeMember_BC203DB4DCBA7276E4F8FEA7B66A9F83_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_BC203DB4DCBA7276E4F8FEA7B66A9F83" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_22E190D3BBFF31547BF4FEA7B66ABB0A" xlink:to="loc_us-gaap_RangeMember_BC203DB4DCBA7276E4F8FEA7B66A9F83" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2C9BFB95831827556DDDFEA7B66A7180" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_251F2CE17D8B86C17AFFFEA7B66ACC22" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2C9BFB95831827556DDDFEA7B66A7180" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_2C7217708BB4318E9488FEA7B66A6F8A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_251F2CE17D8B86C17AFFFEA7B66ACC22" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_2C7217708BB4318E9488FEA7B66A6F8A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_F18FF403F5BDDAFAA72EFEA7B66AD6B5" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_251F2CE17D8B86C17AFFFEA7B66ACC22" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_F18FF403F5BDDAFAA72EFEA7B66AD6B5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_D0A9555353F5BCE546CFFEA7B66A31E5" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_251F2CE17D8B86C17AFFFEA7B66ACC22" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_D0A9555353F5BCE546CFFEA7B66A31E5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_804099AAB3AFE4FA258CFEA7B66AD8CB" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_251F2CE17D8B86C17AFFFEA7B66ACC22" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_804099AAB3AFE4FA258CFEA7B66AD8CB" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/GoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsWeightedAverageUsefulLivesAssignedToFiniteLivedIntangibleAssetsAcquiredInBusinessCombinationsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_A18F5A39BD400BB289000874A6F249D5" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_B9DAB8B3166B7589DDAC0874A6EC657F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_A18F5A39BD400BB289000874A6F249D5" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_B9DAB8B3166B7589DDAC0874A6EC657F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E2DFC10DEA91B77CC14E0874A6EC0AD2" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_B9DAB8B3166B7589DDAC0874A6EC657F" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E2DFC10DEA91B77CC14E0874A6EC0AD2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_527F4984A181C619E4C20874A6EC960F_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E2DFC10DEA91B77CC14E0874A6EC0AD2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_527F4984A181C619E4C20874A6EC960F_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_527F4984A181C619E4C20874A6EC960F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E2DFC10DEA91B77CC14E0874A6EC0AD2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_527F4984A181C619E4C20874A6EC960F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_A691CB83884AC8FA37840874A6EC569E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_527F4984A181C619E4C20874A6EC960F" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_A691CB83884AC8FA37840874A6EC569E" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TrademarksandTechnologyMember" xlink:label="loc_unh_TrademarksandTechnologyMember_7EF6DA01C778F3DAADFD0874A6F24240" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_527F4984A181C619E4C20874A6EC960F" xlink:to="loc_unh_TrademarksandTechnologyMember_7EF6DA01C778F3DAADFD0874A6F24240" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_C329D2D4126C798257990874A6F2825B" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_527F4984A181C619E4C20874A6EC960F" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_C329D2D4126C798257990874A6F2825B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_5C5AA93E69F79DC6DF2E0874A6F2553D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_A18F5A39BD400BB289000874A6F249D5" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_5C5AA93E69F79DC6DF2E0874A6F2553D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_9803C5FEDF233CE051920874A6F2804F" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_A18F5A39BD400BB289000874A6F249D5" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_9803C5FEDF233CE051920874A6F2804F" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/GoodwillAndIntangibleAssetsNotes" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/GoodwillAndIntangibleAssetsTables" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/IncomeTaxesIncomeTaxReconciliationOfTaxProvisionAtUSFederalStatutoryRateDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExaminationLineItems" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExaminationTable" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_12BEE6993B24891D8A3AF89740077260" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_12BEE6993B24891D8A3AF89740077260" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_C150247D6C78955F0C9EF8974007FF7C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_12BEE6993B24891D8A3AF89740077260" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_C150247D6C78955F0C9EF8974007FF7C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_B0B8BB90D9BDF1116DE1F89740072491_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_C150247D6C78955F0C9EF8974007FF7C" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_B0B8BB90D9BDF1116DE1F89740072491_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_B0B8BB90D9BDF1116DE1F89740072491" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_C150247D6C78955F0C9EF8974007FF7C" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_B0B8BB90D9BDF1116DE1F89740072491" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_F1ECC94FE5870E776A33F8974007D934" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_12BEE6993B24891D8A3AF89740077260" xlink:to="loc_us-gaap_RangeAxis_F1ECC94FE5870E776A33F8974007D934" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F09212B87C9A3E197865F8974007829E_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_F1ECC94FE5870E776A33F8974007D934" xlink:to="loc_us-gaap_RangeMember_F09212B87C9A3E197865F8974007829E_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F09212B87C9A3E197865F8974007829E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_F1ECC94FE5870E776A33F8974007D934" xlink:to="loc_us-gaap_RangeMember_F09212B87C9A3E197865F8974007829E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_1705D264CDEAAC21BDBDF897400705EC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_1705D264CDEAAC21BDBDF897400705EC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_7617CEC00EFD6D673ACEF8974007D908" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_7617CEC00EFD6D673ACEF8974007D908" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_09EE3FF830000BE2C78FF897400759E4" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_09EE3FF830000BE2C78FF897400759E4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_1314BE855504AFDD0208F8974008C32C" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_1314BE855504AFDD0208F8974008C32C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxSettlementsStateAndLocal" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxSettlementsStateAndLocal_4C989B73D121EEF08E19F8974008E85C" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxSettlementsStateAndLocal_4C989B73D121EEF08E19F8974008E85C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal_A96DEE57053F0FCBD4FBF8974008C094" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal_A96DEE57053F0FCBD4FBF8974008C094" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxExemptIncome" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxExemptIncome_9BA46AF83F58332E6A58F8974008AEA3" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxExemptIncome_9BA46AF83F58332E6A58F8974008AEA3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome_33012DBFE176C7A0D6D8F89740087CFB" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome_33012DBFE176C7A0D6D8F89740087CFB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpense" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpense_DC721F0BCB0C63C70D8CF897400823ED" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpense_DC721F0BCB0C63C70D8CF897400823ED" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_62D179472690BFABFD59F89740080547" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_62D179472690BFABFD59F89740080547" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_AB1C100FABE550C66C5EF897400EE31C" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_AB1C100FABE550C66C5EF897400EE31C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_412DD312C15D33C3D0BCF897400E026A" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_412DD312C15D33C3D0BCF897400E026A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_6E2C5D74816A1103CD41F897400E556E" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_6E2C5D74816A1103CD41F897400E556E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_98B1EC6B5692B9846F8CF897400E67FE" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_142D1780090A244DB87FF89740073256" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_98B1EC6B5692B9846F8CF897400E67FE" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/IncomeTaxesIncomeTaxesComponentsOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExaminationLineItems" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExaminationTable" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_2CE3B004F06636851D900297A842D2AD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_2CE3B004F06636851D900297A842D2AD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_0E2F8481DCC7A4B0DDE60297A8420A50" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_2CE3B004F06636851D900297A842D2AD" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_0E2F8481DCC7A4B0DDE60297A8420A50" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_3D0A281F47375D863C8A0297A842D424_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_0E2F8481DCC7A4B0DDE60297A8420A50" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_3D0A281F47375D863C8A0297A842D424_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_3D0A281F47375D863C8A0297A842D424" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_0E2F8481DCC7A4B0DDE60297A8420A50" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_3D0A281F47375D863C8A0297A842D424" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_954DE3A2D8DEAEDD69790297A84291A1" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_2CE3B004F06636851D900297A842D2AD" xlink:to="loc_us-gaap_RangeAxis_954DE3A2D8DEAEDD69790297A84291A1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_6B4D6362C32EC806D7110297A842A126_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_954DE3A2D8DEAEDD69790297A84291A1" xlink:to="loc_us-gaap_RangeMember_6B4D6362C32EC806D7110297A842A126_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_6B4D6362C32EC806D7110297A842A126" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_954DE3A2D8DEAEDD69790297A84291A1" xlink:to="loc_us-gaap_RangeMember_6B4D6362C32EC806D7110297A842A126" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances_86BBD18B86F1C501F4540297A8438AD4" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances_86BBD18B86F1C501F4540297A8438AD4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic_841BB8E4A89683C8CD540297A843BFC8" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic_841BB8E4A89683C8CD540297A843BFC8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_E850595586274D12418E0297A84386A5" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_E850595586274D12418E0297A84386A5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsOther" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_B5062359589CE88C60150297A8432CB9" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_B5062359589CE88C60150297A8432CB9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals_EF9FA275AD56678F06550297A8432152" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals_EF9FA275AD56678F06550297A8432152" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_5BD81752F5D1A6633CB60297A843B544" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_5BD81752F5D1A6633CB60297A843B544" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsDeferredIncome" xlink:label="loc_us-gaap_DeferredTaxAssetsDeferredIncome_9382614589DFD12981470297A843B07A" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsDeferredIncome_9382614589DFD12981470297A843B07A" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_DeferredTaxAssetUnrecognizedTaxBenefits" xlink:label="loc_unh_DeferredTaxAssetUnrecognizedTaxBenefits_DC45C6E7EA452C9D702A0297A843053C" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_unh_DeferredTaxAssetUnrecognizedTaxBenefits_DC45C6E7EA452C9D702A0297A843053C" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_DeferredTaxAssetsDomesticOther" xlink:label="loc_unh_DeferredTaxAssetsDomesticOther_594E72C8BB339B318BF60297A843C934" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_unh_DeferredTaxAssetsDomesticOther_594E72C8BB339B318BF60297A843C934" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_DeferredTaxAssetsForeignOther" xlink:label="loc_unh_DeferredTaxAssetsForeignOther_4BDD05E26C3041F4FFF30297A84313D4" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_unh_DeferredTaxAssetsForeignOther_4BDD05E26C3041F4FFF30297A84313D4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsGross" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_BAD0CB497B94F0FED1C00297A844946E" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_BAD0CB497B94F0FED1C00297A844946E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_CF930F5E7B8D76D1B7AC0297A844AE90" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_CF930F5E7B8D76D1B7AC0297A844AE90" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_E0F5D15BE62B0EDB95880297A8441182" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_E0F5D15BE62B0EDB95880297A8441182" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets_56BEC2A7FCDF1488F2A50297A849DCA0" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets_56BEC2A7FCDF1488F2A50297A849DCA0" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsForeign" xlink:label="loc_unh_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsForeign_4C8B8BBEF2DF26559C460297A849F535" xlink:type="locator"/>
<definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_unh_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsForeign_4C8B8BBEF2DF26559C460297A849F535" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware_C87D31AACF5D086C69100297A84958B6" xlink:type="locator"/>
<definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware_C87D31AACF5D086C69100297A84958B6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome_5078239D4C6FC20A1C860297A84928B0" xlink:type="locator"/>
<definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome_5078239D4C6FC20A1C860297A84928B0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_3829488B9CA455CCAF6F0297A849FC74" xlink:type="locator"/>
<definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_3829488B9CA455CCAF6F0297A849FC74" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPrepaidExpenses" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_BAEC55EC1413D28B2BCB0297A849D0B7" xlink:type="locator"/>
<definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_BAEC55EC1413D28B2BCB0297A849D0B7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_50D1900A1D5F2CA7B40A0297A8494113" xlink:type="locator"/>
<definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_50D1900A1D5F2CA7B40A0297A8494113" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_AC082FED28E8042BE4990297A84938B8" xlink:type="locator"/>
<definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_AC082FED28E8042BE4990297A84938B8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="loc_us-gaap_DeferredTaxLiabilities_AEF64081694CD7F2FC820297A84A0B27" xlink:type="locator"/>
<definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_1387DBCD2756868B601E0297A8434BA5" xlink:to="loc_us-gaap_DeferredTaxLiabilities_AEF64081694CD7F2FC820297A84A0B27" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/IncomeTaxesIncomeTaxesPolicies" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/IncomeTaxesIncomeTaxesReconciliationOfBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TaxCreditCarryforwardLineItems" xlink:label="loc_us-gaap_TaxCreditCarryforwardLineItems_CDDC899C8CF680F56AB50297A828A0CC" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TaxCreditCarryforwardTable" xlink:label="loc_us-gaap_TaxCreditCarryforwardTable_B09816CC0FE024F718F40297A823D8B0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_CDDC899C8CF680F56AB50297A828A0CC" xlink:to="loc_us-gaap_TaxCreditCarryforwardTable_B09816CC0FE024F718F40297A823D8B0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TaxCreditCarryforwardAxis" xlink:label="loc_us-gaap_TaxCreditCarryforwardAxis_E0211A31FFA90DB3BD0D0297A823464D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_TaxCreditCarryforwardTable_B09816CC0FE024F718F40297A823D8B0" xlink:to="loc_us-gaap_TaxCreditCarryforwardAxis_E0211A31FFA90DB3BD0D0297A823464D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TaxCreditCarryforwardNameDomain" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_2C0FED4C77AC7838BC6C0297A823ECB0_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_E0211A31FFA90DB3BD0D0297A823464D" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_2C0FED4C77AC7838BC6C0297A823ECB0_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TaxCreditCarryforwardNameDomain" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_2C0FED4C77AC7838BC6C0297A823ECB0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_E0211A31FFA90DB3BD0D0297A823464D" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_2C0FED4C77AC7838BC6C0297A823ECB0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_C49FC038CEDAD464EBF50297A828BB91" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_CDDC899C8CF680F56AB50297A828A0CC" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_C49FC038CEDAD464EBF50297A828BB91" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_83F9332EBE0B48F7CC960297A8281B5D" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_CDDC899C8CF680F56AB50297A828A0CC" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_83F9332EBE0B48F7CC960297A8281B5D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_0D08334B3878008884E20297A829CD84" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_CDDC899C8CF680F56AB50297A828A0CC" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_0D08334B3878008884E20297A829CD84" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_76C4CB46ECD59CB0256D0297A8295DBD" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_CDDC899C8CF680F56AB50297A828A0CC" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_76C4CB46ECD59CB0256D0297A8295DBD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_352178043E06053B26B50297A829BD37" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_CDDC899C8CF680F56AB50297A828A0CC" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_352178043E06053B26B50297A829BD37" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_21D5ABA34821E0CC2BB90297A8292545" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_CDDC899C8CF680F56AB50297A828A0CC" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_21D5ABA34821E0CC2BB90297A8292545" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/IncomeTaxesIncomeTaxesReconciliationOfProvisionForIncomeTaxesDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExaminationLineItems" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_7972D43C677B72178C4A0874A6399AAB" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExaminationTable" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_4E692A3F7BA7EC64CBAC0874A63964A3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_7972D43C677B72178C4A0874A6399AAB" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_4E692A3F7BA7EC64CBAC0874A63964A3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_F06D0EF959195310E35F0874A6395434" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_4E692A3F7BA7EC64CBAC0874A63964A3" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_F06D0EF959195310E35F0874A6395434" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_C904719D7AF32AC1760B0874A6391489_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_F06D0EF959195310E35F0874A6395434" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_C904719D7AF32AC1760B0874A6391489_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_C904719D7AF32AC1760B0874A6391489" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_F06D0EF959195310E35F0874A6395434" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_C904719D7AF32AC1760B0874A6391489" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_937BED5B5D52FF13C8D60874A63927B5" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_4E692A3F7BA7EC64CBAC0874A63964A3" xlink:to="loc_us-gaap_RangeAxis_937BED5B5D52FF13C8D60874A63927B5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_0E5CE3C8C37ABF5EA3FA0874A639B57C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_937BED5B5D52FF13C8D60874A63927B5" xlink:to="loc_us-gaap_RangeMember_0E5CE3C8C37ABF5EA3FA0874A639B57C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_0E5CE3C8C37ABF5EA3FA0874A639B57C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_937BED5B5D52FF13C8D60874A63927B5" xlink:to="loc_us-gaap_RangeMember_0E5CE3C8C37ABF5EA3FA0874A639B57C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_3AFD236FA1F8A7896E5F0874A63A7E01" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_7972D43C677B72178C4A0874A6399AAB" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_3AFD236FA1F8A7896E5F0874A63A7E01" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_4C480DFF3110FA4872A20874A63AD709" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_7972D43C677B72178C4A0874A6399AAB" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_4C480DFF3110FA4872A20874A63AD709" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_656F1B04088E3351804D0874A63AF318" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_7972D43C677B72178C4A0874A6399AAB" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_656F1B04088E3351804D0874A63AF318" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_E8F14BB98EFEC0ACD8B00874A63FCDED" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_7972D43C677B72178C4A0874A6399AAB" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_E8F14BB98EFEC0ACD8B00874A63FCDED" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_4337D533CA4A757291090874A63F24F7" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_7972D43C677B72178C4A0874A6399AAB" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_4337D533CA4A757291090874A63F24F7" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExaminationLineItems" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_918D49E09CF3AC9D3645029FCD7A0225" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExaminationTable" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_7236062BA5DCB887A82B029FCD79AEE2" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_918D49E09CF3AC9D3645029FCD7A0225" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_7236062BA5DCB887A82B029FCD79AEE2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_3C8A6DE252A5EE9BF52E029FCD7A31C8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_7236062BA5DCB887A82B029FCD79AEE2" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_3C8A6DE252A5EE9BF52E029FCD7A31C8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_1696D7469CB3F4FA1EF7029FCD7AD471_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_3C8A6DE252A5EE9BF52E029FCD7A31C8" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_1696D7469CB3F4FA1EF7029FCD7AD471_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_1696D7469CB3F4FA1EF7029FCD7AD471" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_3C8A6DE252A5EE9BF52E029FCD7A31C8" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_1696D7469CB3F4FA1EF7029FCD7AD471" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_476473AF5A6AA417A590029FCD7AA7F0" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_7236062BA5DCB887A82B029FCD79AEE2" xlink:to="loc_us-gaap_RangeAxis_476473AF5A6AA417A590029FCD7AA7F0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_928FF92E984F2A104A8A029FCD7AE9C7_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_476473AF5A6AA417A590029FCD7AA7F0" xlink:to="loc_us-gaap_RangeMember_928FF92E984F2A104A8A029FCD7AE9C7_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_928FF92E984F2A104A8A029FCD7AE9C7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_476473AF5A6AA417A590029FCD7AA7F0" xlink:to="loc_us-gaap_RangeMember_928FF92E984F2A104A8A029FCD7AE9C7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="loc_us-gaap_OperatingLossCarryforwards_0E08CD8180D17D6EC29002A017FFA106" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_918D49E09CF3AC9D3645029FCD7A0225" xlink:to="loc_us-gaap_OperatingLossCarryforwards_0E08CD8180D17D6EC29002A017FFA106" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UndistributedEarningsOfForeignSubsidiaries" xlink:label="loc_us-gaap_UndistributedEarningsOfForeignSubsidiaries_42820B63F6C41D7F511B02A23D22D0F7" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_918D49E09CF3AC9D3645029FCD7A0225" xlink:to="loc_us-gaap_UndistributedEarningsOfForeignSubsidiaries_42820B63F6C41D7F511B02A23D22D0F7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_26695B461C072FD6D4B402A2E1310F50" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_918D49E09CF3AC9D3645029FCD7A0225" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_26695B461C072FD6D4B402A2E1310F50" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_ED6163AF0EAAADD7297F02A3F716CB60" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_918D49E09CF3AC9D3645029FCD7A0225" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_ED6163AF0EAAADD7297F02A3F716CB60" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_62A0632B6D47E1998D6C02A5C7E04D96" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_918D49E09CF3AC9D3645029FCD7A0225" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_62A0632B6D47E1998D6C02A5C7E04D96" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit" xlink:label="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit_761EF6E4FF831382BD0D02A67FF0CF92" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_918D49E09CF3AC9D3645029FCD7A0225" xlink:to="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit_761EF6E4FF831382BD0D02A67FF0CF92" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/IncomeTaxesNotes" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/IncomeTaxesTables" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxContingencyLineItems" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_C30B07786924E8B533E30874A654D612" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxContingencyTable" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_5D05F6CD9EA4B27594B60874A64E42DC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_C30B07786924E8B533E30874A654D612" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_5D05F6CD9EA4B27594B60874A64E42DC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_1FFA4CB616E20D404F7E0874A6538E1F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_5D05F6CD9EA4B27594B60874A64E42DC" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_1FFA4CB616E20D404F7E0874A6538E1F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_43B86E244196428FE8AC0874A654EB7C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_1FFA4CB616E20D404F7E0874A6538E1F" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_43B86E244196428FE8AC0874A654EB7C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_43B86E244196428FE8AC0874A654EB7C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_1FFA4CB616E20D404F7E0874A6538E1F" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_43B86E244196428FE8AC0874A654EB7C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_47599F88B4E2DC4A50AC0874A654EF62" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_C30B07786924E8B533E30874A654D612" xlink:to="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_47599F88B4E2DC4A50AC0874A654EF62" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_712F17716745425ACD4F0874A6546F4A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_C30B07786924E8B533E30874A654D612" xlink:to="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_712F17716745425ACD4F0874A6546F4A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_CE5B93EA4ECB30072E570874A654D710" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_C30B07786924E8B533E30874A654D612" xlink:to="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_CE5B93EA4ECB30072E570874A654D710" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock_DAC2011C0740BE5B2D7A0874A654B9E1" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_C30B07786924E8B533E30874A654D612" xlink:to="loc_us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock_DAC2011C0740BE5B2D7A0874A654B9E1" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/Investments" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/InvestmentsAmortizedCostAndFairValueOfAvailableForSaleDebtSecuritiesByContractualMaturityDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_5B7EA27A3EC06EBC1AEA5CD9E4236A69" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_5B7EA27A3EC06EBC1AEA5CD9E4236A69" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_DEAEC7B650788467C60F5CD9E423E032" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_5B7EA27A3EC06EBC1AEA5CD9E4236A69" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_DEAEC7B650788467C60F5CD9E423E032" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_E84E20948C8563692A675CD9E423B75C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_DEAEC7B650788467C60F5CD9E423E032" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_E84E20948C8563692A675CD9E423B75C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_E84E20948C8563692A675CD9E423B75C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_DEAEC7B650788467C60F5CD9E423E032" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_E84E20948C8563692A675CD9E423B75C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_2036449DF360FA3D8E165CD9E4243105" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_E84E20948C8563692A675CD9E423B75C" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_2036449DF360FA3D8E165CD9E4243105" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_C197F46FF2E5E88930A85CD9E42483ED" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_E84E20948C8563692A675CD9E423B75C" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_C197F46FF2E5E88930A85CD9E42483ED" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_359BF5103C183CBA535F5CD9E424D528" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_359BF5103C183CBA535F5CD9E424D528" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_3C70985C234B1ABAA65B5CD9E4249A39" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_3C70985C234B1ABAA65B5CD9E4249A39" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_1939ABAC24FAAFE5C4EA5CD9E424F88C" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_1939ABAC24FAAFE5C4EA5CD9E424F88C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_BADB29D71DF26C7082475CD9E424B7E5" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_BADB29D71DF26C7082475CD9E424B7E5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_D1C113B9E67E3DFBB0DB5CD9E424356A" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_D1C113B9E67E3DFBB0DB5CD9E424356A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost_E3B166C9BF12BB1296065CD9E42441C5" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost_E3B166C9BF12BB1296065CD9E42441C5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_4D0203D9EFD3201337045CD9E425E1A4" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_4D0203D9EFD3201337045CD9E425E1A4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_FD4958565630CC4F4DDA5CD9E425075C" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_FD4958565630CC4F4DDA5CD9E425075C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_0D2594E25C619D76C0CC5CD9E42572C3" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_0D2594E25C619D76C0CC5CD9E42572C3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_125F7204A9E6802371455CD9E4253CD9" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_125F7204A9E6802371455CD9E4253CD9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_2C04A2490F30A121F2475CD9E425E5BE" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_2C04A2490F30A121F2475CD9E425E5BE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_B9D349A218E573468E0D5CD9E4255DF1" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F8DD2391A1B4DB7684585CD9E4240BE6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_B9D349A218E573468E0D5CD9E4255DF1" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/InvestmentsAmortizedCostAndFairValueOfHeldToMaturityDebtSecuritiesByContractualMaturityDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_C2474D1049DF094FF4CE5CD9E2B99682" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_C2474D1049DF094FF4CE5CD9E2B99682" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_BB0322256D0B204B2AF95CD9E2B9F792" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_C2474D1049DF094FF4CE5CD9E2B99682" xlink:to="loc_us-gaap_InvestmentTypeAxis_BB0322256D0B204B2AF95CD9E2B9F792" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SummaryOfInvestmentsByTypeDomain" xlink:label="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_93FC48E472A5522AD4585CD9E2B934BB_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_BB0322256D0B204B2AF95CD9E2B9F792" xlink:to="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_93FC48E472A5522AD4585CD9E2B934BB_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SummaryOfInvestmentsByTypeDomain" xlink:label="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_93FC48E472A5522AD4585CD9E2B934BB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_BB0322256D0B204B2AF95CD9E2B9F792" xlink:to="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_93FC48E472A5522AD4585CD9E2B934BB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_0D5F7A493B021FEEDE435CD9E2B910A1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_0D5F7A493B021FEEDE435CD9E2B910A1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_B72D4982FEC1984CFF105CD9E2BAB0DE" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_B72D4982FEC1984CFF105CD9E2BAB0DE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_C78907F7C997497B59A85CD9E2BAD77C" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_C78907F7C997497B59A85CD9E2BAD77C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_064CF59A0D25BBBC4AFE5CD9E2BAFA9B" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_064CF59A0D25BBBC4AFE5CD9E2BAFA9B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecurities" xlink:label="loc_us-gaap_HeldToMaturitySecurities_91CF6274530C220E567E5CD9E2BAE782" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecurities_91CF6274530C220E567E5CD9E2BAE782" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_4617D0FD64BE431EC3195CD9E2BA8573" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_4617D0FD64BE431EC3195CD9E2BA8573" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_C7C5F3860DBC17795A185CD9E2BA48AB" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_C7C5F3860DBC17795A185CD9E2BA48AB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_2FCB698BE5AE513FFD7B5CD9E2BAFA6E" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_2FCB698BE5AE513FFD7B5CD9E2BAFA6E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_90A301682B365A0932D25CD9E2BAC844" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_90A301682B365A0932D25CD9E2BAC844" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_01B1121AE5E1E798729F5CD9E2BA46B2" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_F068548352563CFD333A5CD9E2B95AE8" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_01B1121AE5E1E798729F5CD9E2BA46B2" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/InvestmentsFairValueOfAvailableForSaleInvestmentsWithGrossUnrealizedLossesByInvestmentTypeAndLengthOfTimeThatIndividualSecuritiesHaveBeenInContinuousUnrealizedLossPositionDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_14F56A0B49098126ECAE0874A8CBAC10" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_2DF2893D42E01CE9734C0874A8C5DD13" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_14F56A0B49098126ECAE0874A8CBAC10" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_2DF2893D42E01CE9734C0874A8C5DD13" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_F1E9226CE1CD9F6701780874A8C54259" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_2DF2893D42E01CE9734C0874A8C5DD13" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_F1E9226CE1CD9F6701780874A8C54259" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_5F272D22B94702D936E20874A8C68EAB_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_F1E9226CE1CD9F6701780874A8C54259" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_5F272D22B94702D936E20874A8C68EAB_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_5F272D22B94702D936E20874A8C68EAB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_F1E9226CE1CD9F6701780874A8C54259" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_5F272D22B94702D936E20874A8C68EAB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_FDF667B3B8D0F5F245810874A8C6FE49" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_5F272D22B94702D936E20874A8C68EAB" xlink:to="loc_us-gaap_DebtSecuritiesMember_FDF667B3B8D0F5F245810874A8C6FE49" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USTreasuryAndGovernmentMember" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_59FF46825E1D8AE6E9440874A8C695E2" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_FDF667B3B8D0F5F245810874A8C6FE49" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_59FF46825E1D8AE6E9440874A8C695E2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_0996946623DD71EC367A0874A8CBBB02" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_FDF667B3B8D0F5F245810874A8C6FE49" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_0996946623DD71EC367A0874A8CBBB02" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_846D1046D89FDFE4992A0874A8CBEB0C" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_FDF667B3B8D0F5F245810874A8C6FE49" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_846D1046D89FDFE4992A0874A8CBEB0C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_E0F715FE6EBA5335ADCE0874A8CB0E3E" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_FDF667B3B8D0F5F245810874A8C6FE49" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_E0F715FE6EBA5335ADCE0874A8CB0E3E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_DA915B05A7697B2D6C960874A8CBBAD2" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_FDF667B3B8D0F5F245810874A8C6FE49" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_DA915B05A7697B2D6C960874A8CBBAD2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_15D7A63BF62792D39C820874A8CB40B2" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_5F272D22B94702D936E20874A8C68EAB" xlink:to="loc_us-gaap_EquitySecuritiesMember_15D7A63BF62792D39C820874A8CB40B2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_D8941AC4E8601D925B810874A8CB741A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_14F56A0B49098126ECAE0874A8CBAC10" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_D8941AC4E8601D925B810874A8CB741A" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss" xlink:label="loc_unh_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss_1641A07C10812F05F5FA0874A8CC773B" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_14F56A0B49098126ECAE0874A8CBAC10" xlink:to="loc_unh_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss_1641A07C10812F05F5FA0874A8CC773B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_8DBE5AC7D0D36E25A9E80874A8CC5391" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_14F56A0B49098126ECAE0874A8CBAC10" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_8DBE5AC7D0D36E25A9E80874A8CC5391" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses" xlink:label="loc_unh_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses_4834A170D03E53AF9A7D0874A8D1C3C3" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_14F56A0B49098126ECAE0874A8CBAC10" xlink:to="loc_unh_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses_4834A170D03E53AF9A7D0874A8D1C3C3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue_FFA6CF4D6798F5B8E6810874A8CC558C" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_14F56A0B49098126ECAE0874A8CBAC10" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue_FFA6CF4D6798F5B8E6810874A8CC558C" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AvailableforsalAvailableforsaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" xlink:label="loc_unh_AvailableforsalAvailableforsaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_99FBB36D3D48740EE9A10874A8D135C8" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_14F56A0B49098126ECAE0874A8CBAC10" xlink:to="loc_unh_AvailableforsalAvailableforsaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_99FBB36D3D48740EE9A10874A8D135C8" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/InvestmentsFairValueOfMortgageBackedSecuritiesByCreditRatingOriginationDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_FEE234D9344C5BB372155CD9E395F813" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_197B11FCBE103C8A4BCF5CD9E393477C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_FEE234D9344C5BB372155CD9E395F813" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_197B11FCBE103C8A4BCF5CD9E393477C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ExternalCreditRatingByGroupingAxis" xlink:label="loc_us-gaap_ExternalCreditRatingByGroupingAxis_D64AB72F55B04D4CB9C45CD9E3943FD0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_197B11FCBE103C8A4BCF5CD9E393477C" xlink:to="loc_us-gaap_ExternalCreditRatingByGroupingAxis_D64AB72F55B04D4CB9C45CD9E3943FD0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ExternalCreditRatingByGroupingDomain" xlink:label="loc_us-gaap_ExternalCreditRatingByGroupingDomain_2B4034EF4FB76B735E845CD9E394149E_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ExternalCreditRatingByGroupingAxis_D64AB72F55B04D4CB9C45CD9E3943FD0" xlink:to="loc_us-gaap_ExternalCreditRatingByGroupingDomain_2B4034EF4FB76B735E845CD9E394149E_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ExternalCreditRatingByGroupingDomain" xlink:label="loc_us-gaap_ExternalCreditRatingByGroupingDomain_2B4034EF4FB76B735E845CD9E394149E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ExternalCreditRatingByGroupingAxis_D64AB72F55B04D4CB9C45CD9E3943FD0" xlink:to="loc_us-gaap_ExternalCreditRatingByGroupingDomain_2B4034EF4FB76B735E845CD9E394149E" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AaaCreditRatingMember" xlink:label="loc_unh_AaaCreditRatingMember_C62D4FF899AF75D649885CD9E3942CA5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ExternalCreditRatingByGroupingDomain_2B4034EF4FB76B735E845CD9E394149E" xlink:to="loc_unh_AaaCreditRatingMember_C62D4FF899AF75D649885CD9E3942CA5" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AaMember" xlink:label="loc_unh_AaMember_74D150B5145D304CF2975CD9E394D1D9" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ExternalCreditRatingByGroupingDomain_2B4034EF4FB76B735E845CD9E394149E" xlink:to="loc_unh_AaMember_74D150B5145D304CF2975CD9E394D1D9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ExternalCreditRatingNonInvestmentGradeMember" xlink:label="loc_us-gaap_ExternalCreditRatingNonInvestmentGradeMember_BEE50E1A7AC58FB24F405CD9E3942210" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ExternalCreditRatingByGroupingDomain_2B4034EF4FB76B735E845CD9E394149E" xlink:to="loc_us-gaap_ExternalCreditRatingNonInvestmentGradeMember_BEE50E1A7AC58FB24F405CD9E3942210" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_358FDA8A13EB1D22AF4F5CD9E3943BDB" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_197B11FCBE103C8A4BCF5CD9E393477C" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_358FDA8A13EB1D22AF4F5CD9E3943BDB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_7241F42F4F54B2EE36055CD9E394C012_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_358FDA8A13EB1D22AF4F5CD9E3943BDB" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_7241F42F4F54B2EE36055CD9E394C012_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_7241F42F4F54B2EE36055CD9E394C012" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_358FDA8A13EB1D22AF4F5CD9E3943BDB" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_7241F42F4F54B2EE36055CD9E394C012" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_5A4F66F727A615253EE25CD9E3948FC1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_7241F42F4F54B2EE36055CD9E394C012" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_5A4F66F727A615253EE25CD9E3948FC1" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SecuritiesByOriginationAxis" xlink:label="loc_unh_SecuritiesByOriginationAxis_8669E4B477B82B5EB9A95CD9E394C6A9" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_197B11FCBE103C8A4BCF5CD9E393477C" xlink:to="loc_unh_SecuritiesByOriginationAxis_8669E4B477B82B5EB9A95CD9E394C6A9" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SecuritiesByOriginationDomain" xlink:label="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_unh_SecuritiesByOriginationAxis_8669E4B477B82B5EB9A95CD9E394C6A9" xlink:to="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B_default" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_SecuritiesByOriginationDomain" xlink:label="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_unh_SecuritiesByOriginationAxis_8669E4B477B82B5EB9A95CD9E394C6A9" xlink:to="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TwoThousandThirteenMember" xlink:label="loc_unh_TwoThousandThirteenMember_22D3B27CDDDFC2896B625CD9E39495A6" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B" xlink:to="loc_unh_TwoThousandThirteenMember_22D3B27CDDDFC2896B625CD9E39495A6" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TwoThousandTwelveMember" xlink:label="loc_unh_TwoThousandTwelveMember_4944A4BFC4353220E0A05CD9E3945343" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B" xlink:to="loc_unh_TwoThousandTwelveMember_4944A4BFC4353220E0A05CD9E3945343" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TwoThousandElevenMember" xlink:label="loc_unh_TwoThousandElevenMember_7A71578196DF0DB909A05CD9E3952743" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B" xlink:to="loc_unh_TwoThousandElevenMember_7A71578196DF0DB909A05CD9E3952743" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TwoThousandTenMember" xlink:label="loc_unh_TwoThousandTenMember_70469857541A385EFC965CD9E39506A1" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B" xlink:to="loc_unh_TwoThousandTenMember_70469857541A385EFC965CD9E39506A1" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TwoThousandNineMember" xlink:label="loc_unh_TwoThousandNineMember_6AA994FAE65B25401DCF5CD9E395D476" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B" xlink:to="loc_unh_TwoThousandNineMember_6AA994FAE65B25401DCF5CD9E395D476" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_OriginationIn2007Member" xlink:label="loc_unh_OriginationIn2007Member_6E0E3BBE4126F3B6E71F5CD9E3952D38" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B" xlink:to="loc_unh_OriginationIn2007Member_6E0E3BBE4126F3B6E71F5CD9E3952D38" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_PreTwoThousandSevenMember" xlink:label="loc_unh_PreTwoThousandSevenMember_F94AB67DE22881342DBA5CD9E395AA2B" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_SecuritiesByOriginationDomain_E5D1F846073CF9896D285CD9E394B99B" xlink:to="loc_unh_PreTwoThousandSevenMember_F94AB67DE22881342DBA5CD9E395AA2B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure" xlink:label="loc_us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure_88AC6DEFB73D428FD15C5CD9E39556BD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FEE234D9344C5BB372155CD9E395F813" xlink:to="loc_us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure_88AC6DEFB73D428FD15C5CD9E39556BD" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/InvestmentsNarrativeDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_00562439FA2C7D599D165CD9E28E78CF" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_32B1C3B4BBE6C50FD5B55CD9E28ED3AC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_00562439FA2C7D599D165CD9E28E78CF" xlink:to="loc_us-gaap_StatementTable_32B1C3B4BBE6C50FD5B55CD9E28ED3AC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_2C7680065C2807A74D0D5CD9E28ECE23" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_32B1C3B4BBE6C50FD5B55CD9E28ED3AC" xlink:to="loc_us-gaap_StatementScenarioAxis_2C7680065C2807A74D0D5CD9E28ECE23" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8F86B25E61ED9716064A5CD9E28E72CE_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_2C7680065C2807A74D0D5CD9E28ECE23" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8F86B25E61ED9716064A5CD9E28E72CE_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8F86B25E61ED9716064A5CD9E28E72CE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_2C7680065C2807A74D0D5CD9E28ECE23" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8F86B25E61ED9716064A5CD9E28E72CE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1_8C0A7EFC87A8CED437725CD9E28EF9F0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_00562439FA2C7D599D165CD9E28E78CF" xlink:to="loc_us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1_8C0A7EFC87A8CED437725CD9E28EF9F0" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TotalNumberOfSecurityPositions" xlink:label="loc_unh_TotalNumberOfSecurityPositions_403E460541309396446C5CD9E28E9337" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_00562439FA2C7D599D165CD9E28E78CF" xlink:to="loc_unh_TotalNumberOfSecurityPositions_403E460541309396446C5CD9E28E9337" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/InvestmentsNetRealizedGainsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_074A85441E677BA33A7A5CD9E25F98E4" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_074A85441E677BA33A7A5CD9E25F98E4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_7A21B62101104899BA835CD9E25FEAC4" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_074A85441E677BA33A7A5CD9E25F98E4" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_7A21B62101104899BA835CD9E25FEAC4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_3EC199E246E800D330495CD9E25F2E61_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7A21B62101104899BA835CD9E25FEAC4" xlink:to="loc_us-gaap_EquityComponentDomain_3EC199E246E800D330495CD9E25F2E61_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_3EC199E246E800D330495CD9E25F2E61" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7A21B62101104899BA835CD9E25FEAC4" xlink:to="loc_us-gaap_EquityComponentDomain_3EC199E246E800D330495CD9E25F2E61" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_51C1C3CF72EE0F06D97F5CD9E25F4D25" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3EC199E246E800D330495CD9E25F2E61" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_51C1C3CF72EE0F06D97F5CD9E25F4D25" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount" xlink:label="loc_us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount_9DFBC262FA2B8EE32EDC5CD9E25FE704" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:to="loc_us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount_9DFBC262FA2B8EE32EDC5CD9E25FE704" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest_B7747122DE97093851145CD9E25FDF52" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest_B7747122DE97093851145CD9E25FDF52" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet_E4D18601AF1DD255EE2B5CD9E25F0036" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet_E4D18601AF1DD255EE2B5CD9E25F0036" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostMethodInvestmentsRealizedLosses" xlink:label="loc_us-gaap_CostMethodInvestmentsRealizedLosses_665ED04BF926A87A7EE75CD9E25F3A00" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:to="loc_us-gaap_CostMethodInvestmentsRealizedLosses_665ED04BF926A87A7EE75CD9E25F3A00" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostMethodInvestmentsRealizedGains" xlink:label="loc_us-gaap_CostMethodInvestmentsRealizedGains_2E4471097176A29647C45CD9E2600092" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:to="loc_us-gaap_CostMethodInvestmentsRealizedGains_2E4471097176A29647C45CD9E2600092" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostMethodInvestmentsRealizedGainLoss" xlink:label="loc_us-gaap_CostMethodInvestmentsRealizedGainLoss_71CC665C35116294946F5CD9E26075B6" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:to="loc_us-gaap_CostMethodInvestmentsRealizedGainLoss_71CC665C35116294946F5CD9E26075B6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_A48AA7CA7A74EADE2CB25CD9E2608DC0" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_A48AA7CA7A74EADE2CB25CD9E2608DC0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnInvestments" xlink:label="loc_us-gaap_GainLossOnInvestments_6F371C2A1D2ED48A0D995CD9E2603AAB" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8C67E3016D008267268A5CD9E25F34FF" xlink:to="loc_us-gaap_GainLossOnInvestments_6F371C2A1D2ED48A0D995CD9E2603AAB" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/InvestmentsShortTermAndLongTermInvestmentsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_EB9B8CF3ED76ADD1991F5CD9E2972C61" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_EB9B8CF3ED76ADD1991F5CD9E2972C61" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_068371E95785B662AB435CD9E29740C0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_EB9B8CF3ED76ADD1991F5CD9E2972C61" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_068371E95785B662AB435CD9E29740C0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_9BD519BAC8AB0A1FC7CD5CD9E29707B8_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_068371E95785B662AB435CD9E29740C0" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_9BD519BAC8AB0A1FC7CD5CD9E29707B8_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_9BD519BAC8AB0A1FC7CD5CD9E29707B8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_068371E95785B662AB435CD9E29740C0" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_9BD519BAC8AB0A1FC7CD5CD9E29707B8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_750F67F138814B33CDBB5CD9E2979C09" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_9BD519BAC8AB0A1FC7CD5CD9E29707B8" xlink:to="loc_us-gaap_DebtSecuritiesMember_750F67F138814B33CDBB5CD9E2979C09" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USTreasuryAndGovernmentMember" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_EFBEAEDD506589078BD85CD9E297C9D1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_750F67F138814B33CDBB5CD9E2979C09" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_EFBEAEDD506589078BD85CD9E297C9D1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_CA5D3E16231128E1A33C5CD9E2978747" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_750F67F138814B33CDBB5CD9E2979C09" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_CA5D3E16231128E1A33C5CD9E2978747" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_947B9733CFEA350D9CD65CD9E297310D" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_750F67F138814B33CDBB5CD9E2979C09" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_947B9733CFEA350D9CD65CD9E297310D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_2EC9FEF7F925899FB5DD5CD9E2977F7A" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_750F67F138814B33CDBB5CD9E2979C09" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_2EC9FEF7F925899FB5DD5CD9E2977F7A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_5E69AC346947886365A65CD9E297E95F" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_750F67F138814B33CDBB5CD9E2979C09" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_5E69AC346947886365A65CD9E297E95F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_D43708A8129E1EF35C555CD9E298DA16" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_D43708A8129E1EF35C555CD9E298DA16" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedGainbeforeTax" xlink:label="loc_unh_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedGainbeforeTax_4BA67A1DF28A1578E0B55CD9E2989176" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_unh_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedGainbeforeTax_4BA67A1DF28A1578E0B55CD9E2989176" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedLossbeforeTax" xlink:label="loc_unh_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedLossbeforeTax_642871E833BFFBE70CBF5CD9E298CB13" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_unh_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedLossbeforeTax_642871E833BFFBE70CBF5CD9E298CB13" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_5C3E0D07CEA65E5D39E25CD9E298BC5D" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_5C3E0D07CEA65E5D39E25CD9E298BC5D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis_0A2FC1F20328B64B96A45CD9E2980A7E" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis_0A2FC1F20328B64B96A45CD9E2980A7E" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AvailableforsaleEquitySecuritiesAccumulatedGrossUnrealizedGainbeforeTax" xlink:label="loc_unh_AvailableforsaleEquitySecuritiesAccumulatedGrossUnrealizedGainbeforeTax_BD3929F9E49FC8D4937C5CD9E298545C" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_unh_AvailableforsaleEquitySecuritiesAccumulatedGrossUnrealizedGainbeforeTax_BD3929F9E49FC8D4937C5CD9E298545C" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AvailableforsaleEquitySecuritiesAccumulatedGrossUnrealizedLossbeforeTax" xlink:label="loc_unh_AvailableforsaleEquitySecuritiesAccumulatedGrossUnrealizedLossbeforeTax_FB344A37830374D3C91B5CD9E29824BD" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_unh_AvailableforsaleEquitySecuritiesAccumulatedGrossUnrealizedLossbeforeTax_FB344A37830374D3C91B5CD9E29824BD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesEquitySecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesEquitySecurities_CBA408966398FA9239825CD9E29813C2" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesEquitySecurities_CBA408966398FA9239825CD9E29813C2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecurities" xlink:label="loc_us-gaap_HeldToMaturitySecurities_E5B05364AD7EFCBFEC1B5CD9E2988051" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_us-gaap_HeldToMaturitySecurities_E5B05364AD7EFCBFEC1B5CD9E2988051" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain" xlink:label="loc_unh_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain_21EBDCA6CB610778AA5B5CD9E29809E5" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_unh_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain_21EBDCA6CB610778AA5B5CD9E29809E5" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss" xlink:label="loc_unh_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_D0227833C97F458EB93D5CD9E298AA66" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_unh_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_D0227833C97F458EB93D5CD9E298AA66" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_BBC476653C5BFCEF88A95CD9E298A99C" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_BBC476653C5BFCEF88A95CD9E298A99C" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_InvestmentsAmortizedCost" xlink:label="loc_unh_InvestmentsAmortizedCost_EC8CCA421999B0C37EB15CD9E29962D2" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_unh_InvestmentsAmortizedCost_EC8CCA421999B0C37EB15CD9E29962D2" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_InvestmentsGrossUnrealizedGains" xlink:label="loc_unh_InvestmentsGrossUnrealizedGains_6E161A85825E98416A4F5CD9E299AEF8" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_unh_InvestmentsGrossUnrealizedGains_6E161A85825E98416A4F5CD9E299AEF8" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_InvestmentsGrossUnrealizedLosses" xlink:label="loc_unh_InvestmentsGrossUnrealizedLosses_40B51CD46A1D0861B06E5CD9E2996021" xlink:type="locator"/>
<definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_unh_InvestmentsGrossUnrealizedLosses_40B51CD46A1D0861B06E5CD9E2996021" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsFairValueDisclosure" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_5BA908EB164AA8B575E45CD9E299B041" xlink:type="locator"/>
<definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E8470A14CB387B4814C75CD9E297FEFC" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_5BA908EB164AA8B575E45CD9E299B041" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/InvestmentsTables" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_58C4EC45B0674420ED025CD9E3BFC050" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_3758D17880F39D33E9995CD9E3BED265" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_58C4EC45B0674420ED025CD9E3BFC050" xlink:to="loc_us-gaap_StatementTable_3758D17880F39D33E9995CD9E3BED265" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_8059BDB9ADE79C77853A5CD9E3BF09BA" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_3758D17880F39D33E9995CD9E3BED265" xlink:to="loc_us-gaap_InvestmentTypeAxis_8059BDB9ADE79C77853A5CD9E3BF09BA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SummaryOfInvestmentsByTypeDomain" xlink:label="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_86746DA3AEABE1D354675CD9E3BF969A_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_8059BDB9ADE79C77853A5CD9E3BF09BA" xlink:to="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_86746DA3AEABE1D354675CD9E3BF969A_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SummaryOfInvestmentsByTypeDomain" xlink:label="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_86746DA3AEABE1D354675CD9E3BF969A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_8059BDB9ADE79C77853A5CD9E3BF09BA" xlink:to="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_86746DA3AEABE1D354675CD9E3BF969A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableforsaleSecuritiesMember" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesMember_8CD09D1DC6EC17CCF7025CD9E3BF0D34" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_86746DA3AEABE1D354675CD9E3BF969A" xlink:to="loc_us-gaap_AvailableforsaleSecuritiesMember_8CD09D1DC6EC17CCF7025CD9E3BF0D34" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_HeldtomaturitySecuritiesMember" xlink:label="loc_us-gaap_HeldtomaturitySecuritiesMember_E5B1E673CC1D9C8B11B55CD9E3BF8531" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SummaryOfInvestmentsByTypeDomain_86746DA3AEABE1D354675CD9E3BF969A" xlink:to="loc_us-gaap_HeldtomaturitySecuritiesMember_E5B1E673CC1D9C8B11B55CD9E3BF8531" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_B74436C601B1B4B3916D5CD9E3BF4633" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_3758D17880F39D33E9995CD9E3BED265" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_B74436C601B1B4B3916D5CD9E3BF4633" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_51FA71215FDE5434A66A5CD9E3BF87AC_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_B74436C601B1B4B3916D5CD9E3BF4633" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_51FA71215FDE5434A66A5CD9E3BF87AC_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_51FA71215FDE5434A66A5CD9E3BF87AC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_B74436C601B1B4B3916D5CD9E3BF4633" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_51FA71215FDE5434A66A5CD9E3BF87AC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_E30D51E51AF72750AC9E5CD9E3BFE820" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_51FA71215FDE5434A66A5CD9E3BF87AC" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_E30D51E51AF72750AC9E5CD9E3BFE820" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock_474F35CA00AB3D4C602C5CD9E3BFE31D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_58C4EC45B0674420ED025CD9E3BFC050" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock_474F35CA00AB3D4C602C5CD9E3BFE31D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock" xlink:label="loc_us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock_1F3C389C552B806C78745CD9E3C0F085" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_58C4EC45B0674420ED025CD9E3BFC050" xlink:to="loc_us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock_1F3C389C552B806C78745CD9E3C0F085" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock_6923E1E4FF3CAD11F30A5CD9E3C0B6B3" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_58C4EC45B0674420ED025CD9E3BFC050" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock_6923E1E4FF3CAD11F30A5CD9E3C0B6B3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealizedGainLossOnInvestmentsTableTextBlock" xlink:label="loc_us-gaap_RealizedGainLossOnInvestmentsTableTextBlock_B8077105F4029C3094885CD9E3C06CAF" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_58C4EC45B0674420ED025CD9E3BFC050" xlink:to="loc_us-gaap_RealizedGainLossOnInvestmentsTableTextBlock_B8077105F4029C3094885CD9E3C06CAF" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/MedicalCostAndMedicalCostsPayable" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/MedicalCostAndMedicalCostsPayableDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_8E982C13134CEF2AF041226DE2B6AF26" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_CC6F92B4623E52EA364F226DE2B6CC62" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_8E982C13134CEF2AF041226DE2B6AF26" xlink:to="loc_us-gaap_StatementTable_CC6F92B4623E52EA364F226DE2B6CC62" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_E9C1488FA58BA578C9A7226DE2B634B4" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_CC6F92B4623E52EA364F226DE2B6CC62" xlink:to="loc_us-gaap_StatementScenarioAxis_E9C1488FA58BA578C9A7226DE2B634B4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_67672ECE88447CDFC72D226DE2B674FE_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_E9C1488FA58BA578C9A7226DE2B634B4" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_67672ECE88447CDFC72D226DE2B674FE_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_67672ECE88447CDFC72D226DE2B674FE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_E9C1488FA58BA578C9A7226DE2B634B4" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_67672ECE88447CDFC72D226DE2B674FE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears_1C7F1B6608D7B812AED3226DE2B6BB0C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8E982C13134CEF2AF041226DE2B6AF26" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears_1C7F1B6608D7B812AED3226DE2B6BB0C" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/MedicalCostAndMedicalCostsPayableMedicalCostAndMedicalCostsPayableTables" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/MedicalCostAndMedicalCostsPayableMedicalCostsAndMedicalCostsPayableRollforwardDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_87F2AE0B74EE04DA9D47226DE2ACF71D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:to="loc_us-gaap_StatementTable_87F2AE0B74EE04DA9D47226DE2ACF71D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_0A783A199D76CFBF40C2226DE2AC8A8E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_87F2AE0B74EE04DA9D47226DE2ACF71D" xlink:to="loc_us-gaap_StatementScenarioAxis_0A783A199D76CFBF40C2226DE2AC8A8E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_4FABDE34716293AD7FB6226DE2ACD840_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_0A783A199D76CFBF40C2226DE2AC8A8E" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_4FABDE34716293AD7FB6226DE2ACD840_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_4FABDE34716293AD7FB6226DE2ACD840" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_0A783A199D76CFBF40C2226DE2AC8A8E" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_4FABDE34716293AD7FB6226DE2ACD840" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_153351E6640B0BAC3782226DE2AC37D6" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_87F2AE0B74EE04DA9D47226DE2ACF71D" xlink:to="loc_us-gaap_StatementClassOfStockAxis_153351E6640B0BAC3782226DE2AC37D6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_4C5289331E119FD15591226DE2ACA2A7_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_153351E6640B0BAC3782226DE2AC37D6" xlink:to="loc_us-gaap_ClassOfStockDomain_4C5289331E119FD15591226DE2ACA2A7_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_4C5289331E119FD15591226DE2ACA2A7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_153351E6640B0BAC3782226DE2AC37D6" xlink:to="loc_us-gaap_ClassOfStockDomain_4C5289331E119FD15591226DE2ACA2A7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_10CCDE0786E6FDDBF388226DE2ACDFE7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:to="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_10CCDE0786E6FDDBF388226DE2ACDFE7" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_LiabilityforClaimsandClaimsAdjustmentExpenseRelatedtoAcquisitions" xlink:label="loc_unh_LiabilityforClaimsandClaimsAdjustmentExpenseRelatedtoAcquisitions_FDB25F9C4E81E31943FE226DE2AC1D10" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:to="loc_unh_LiabilityforClaimsandClaimsAdjustmentExpenseRelatedtoAcquisitions_FDB25F9C4E81E31943FE226DE2AC1D10" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear_9A137449434D5BCAD917226DE2ACAF16" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear_9A137449434D5BCAD917226DE2ACAF16" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears_669832BEE08F1A96CF0E226DE2AC3376" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears_669832BEE08F1A96CF0E226DE2AC3376" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredHealthCare" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredHealthCare_783947D684A78E535F7B226DE2ADF944" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredHealthCare_783947D684A78E535F7B226DE2ADF944" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear_AB5E394889B457401EEC226DE2AD4CA2" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear_AB5E394889B457401EEC226DE2AD4CA2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears_FF2F48E3AFA70230904A226DE2ADA520" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears_FF2F48E3AFA70230904A226DE2ADA520" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid_C8411A78D79735AB4E61226DE2AD4FBB" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FBCC463F460F083CA982226DE2AC687F" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid_C8411A78D79735AB4E61226DE2AD4FBB" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/PropertyPlantAndCapitalizedSoftwareDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_B6046F029FA03FC17D5B64D6B408D3D1" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_C44C0E41B3E70342B56164D6B407DA12" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_B6046F029FA03FC17D5B64D6B408D3D1" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_C44C0E41B3E70342B56164D6B407DA12" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9B6131460F32936CA0AB64D6B4080E85" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_C44C0E41B3E70342B56164D6B407DA12" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9B6131460F32936CA0AB64D6B4080E85" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_79E9302AFCD8B2F73A3B64D6B40875FF_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9B6131460F32936CA0AB64D6B4080E85" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_79E9302AFCD8B2F73A3B64D6B40875FF_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_79E9302AFCD8B2F73A3B64D6B40875FF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9B6131460F32936CA0AB64D6B4080E85" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_79E9302AFCD8B2F73A3B64D6B40875FF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_B2DB8CA1B719AEB2FB1A64D6B408C1C0" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_C44C0E41B3E70342B56164D6B407DA12" xlink:to="loc_us-gaap_RangeAxis_B2DB8CA1B719AEB2FB1A64D6B408C1C0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_64173AB775717C13807F64D6B408ED0F_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_B2DB8CA1B719AEB2FB1A64D6B408C1C0" xlink:to="loc_us-gaap_RangeMember_64173AB775717C13807F64D6B408ED0F_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_64173AB775717C13807F64D6B408ED0F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_B2DB8CA1B719AEB2FB1A64D6B408C1C0" xlink:to="loc_us-gaap_RangeMember_64173AB775717C13807F64D6B408ED0F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_D53E9254AD65A3B2604164D6D5DF9A1F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_B6046F029FA03FC17D5B64D6B408D3D1" xlink:to="loc_us-gaap_Depreciation_D53E9254AD65A3B2604164D6D5DF9A1F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAmortization" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization_1B22616363696359BA8664D812EE2E71" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_B6046F029FA03FC17D5B64D6B408D3D1" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization_1B22616363696359BA8664D812EE2E71" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/PropertyPlantAndCapitalizedSoftwareNotes" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/PropertyPlantAndCapitalizedSoftwarePropertyEquipmentAndCapitalizedSoftwarePropertyEquipmentAndCapitalizedSoftwareTableDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_B8FF74DF9988E811316CDF22A278191A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_B8FF74DF9988E811316CDF22A278191A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_0B601472BF7BA8AAAB38DF22A278C44E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_B8FF74DF9988E811316CDF22A278191A" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_0B601472BF7BA8AAAB38DF22A278C44E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6D2A5879A7552393D4C8DF22A27954B4_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_0B601472BF7BA8AAAB38DF22A278C44E" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6D2A5879A7552393D4C8DF22A27954B4_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6D2A5879A7552393D4C8DF22A27954B4" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_0B601472BF7BA8AAAB38DF22A278C44E" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6D2A5879A7552393D4C8DF22A27954B4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_D0155F45ACBD68DBE000DF22A2799C2A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_B8FF74DF9988E811316CDF22A278191A" xlink:to="loc_us-gaap_RangeAxis_D0155F45ACBD68DBE000DF22A2799C2A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F444A64BEA0C2723E927DF22A27977C4_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_D0155F45ACBD68DBE000DF22A2799C2A" xlink:to="loc_us-gaap_RangeMember_F444A64BEA0C2723E927DF22A27977C4_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F444A64BEA0C2723E927DF22A27977C4" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_D0155F45ACBD68DBE000DF22A2799C2A" xlink:to="loc_us-gaap_RangeMember_F444A64BEA0C2723E927DF22A27977C4" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LandAndLandImprovements" xlink:label="loc_us-gaap_LandAndLandImprovements_8AB4B8BDEE6D67A6FC5EDF22A279C21C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_LandAndLandImprovements_8AB4B8BDEE6D67A6FC5EDF22A279C21C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BuildingsAndImprovementsGross" xlink:label="loc_us-gaap_BuildingsAndImprovementsGross_4A950D87039FCAD9F434DF22A279157B" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_BuildingsAndImprovementsGross_4A950D87039FCAD9F434DF22A279157B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MachineryAndEquipmentGross" xlink:label="loc_us-gaap_MachineryAndEquipmentGross_1CB9B21AFAFBC0C5A3BEDF22A2797AB2" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_MachineryAndEquipmentGross_1CB9B21AFAFBC0C5A3BEDF22A2797AB2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FurnitureAndFixturesGross" xlink:label="loc_us-gaap_FurnitureAndFixturesGross_A736880941D88CA57D76DF22A2798CB6" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_FurnitureAndFixturesGross_A736880941D88CA57D76DF22A2798CB6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation_16330A43FAFE891A7A39DF22A279CCDA" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation_16330A43FAFE891A7A39DF22A279CCDA" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_PropertyPlantandEquipmentExcludingCapitalizedComputerSoftwareNet" xlink:label="loc_unh_PropertyPlantandEquipmentExcludingCapitalizedComputerSoftwareNet_D0124FE6B3DBA75329F3DF22A2799A5E" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_unh_PropertyPlantandEquipmentExcludingCapitalizedComputerSoftwareNet_D0124FE6B3DBA75329F3DF22A2799A5E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CapitalizedComputerSoftwareGross" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareGross_43B147F280D2105FE19DDF22A27A8C6E" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareGross_43B147F280D2105FE19DDF22A27A8C6E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization_F667F359AB3921D8A693DF22A27A0D99" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization_F667F359AB3921D8A693DF22A27A0D99" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_BE402177524B93796D78DF22A27ACDDE" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNet_BE402177524B93796D78DF22A27ACDDE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_D3ABD682C682217C58C2DF22A27A21BE" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_A1EB5E3FF19CA4B7EDE2DF22A2790E93" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_D3ABD682C682217C58C2DF22A27A21BE" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/PropertyPlantAndCapitalizedSoftwareTables" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/QuarterlyFinancialDataDetails" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/QuarterlyFinancialDataNotes" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_93C1C396C223A251B9C9699421F0A506" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_EA4069CEAD169004A130699421EFE068" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_93C1C396C223A251B9C9699421F0A506" xlink:to="loc_us-gaap_StatementTable_EA4069CEAD169004A130699421EFE068" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_9E75651CFC3DA90E3D91699421EF5B9B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_EA4069CEAD169004A130699421EFE068" xlink:to="loc_us-gaap_StatementScenarioAxis_9E75651CFC3DA90E3D91699421EF5B9B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_06D53F5C2E3ECBB40C93699421F0C7EA_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_9E75651CFC3DA90E3D91699421EF5B9B" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_06D53F5C2E3ECBB40C93699421F0C7EA_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_06D53F5C2E3ECBB40C93699421F0C7EA" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_9E75651CFC3DA90E3D91699421EF5B9B" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_06D53F5C2E3ECBB40C93699421F0C7EA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_QuarterlyFinancialInformationTextBlock" xlink:label="loc_us-gaap_QuarterlyFinancialInformationTextBlock_7C4677ABF03E6DB0566B6994591ED755" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_93C1C396C223A251B9C9699421F0A506" xlink:to="loc_us-gaap_QuarterlyFinancialInformationTextBlock_7C4677ABF03E6DB0566B6994591ED755" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/QuarterlyFinancialDataQuarterlyFinancialDataUnauditedDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_246D11B62509365D8A5C6EA88BEA117B" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_DB8630787DE2FEB8B1286EA88BE469D4" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_246D11B62509365D8A5C6EA88BEA117B" xlink:to="loc_us-gaap_StatementTable_DB8630787DE2FEB8B1286EA88BE469D4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_87CF5DED9BB8A3CC7DC96EA88BE49372" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_DB8630787DE2FEB8B1286EA88BE469D4" xlink:to="loc_us-gaap_StatementScenarioAxis_87CF5DED9BB8A3CC7DC96EA88BE49372" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_781BA97F6C2E874B16D06EA88BE91549_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_87CF5DED9BB8A3CC7DC96EA88BE49372" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_781BA97F6C2E874B16D06EA88BE91549_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_781BA97F6C2E874B16D06EA88BE91549" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_87CF5DED9BB8A3CC7DC96EA88BE49372" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_781BA97F6C2E874B16D06EA88BE91549" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_E4E34E742D4E5ED14CBC6EA88BEA7D73" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_246D11B62509365D8A5C6EA88BEA117B" xlink:to="loc_us-gaap_Revenues_E4E34E742D4E5ED14CBC6EA88BEA7D73" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_33D572913FEA146BABBD6EA88BEA3C6A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_246D11B62509365D8A5C6EA88BEA117B" xlink:to="loc_us-gaap_CostsAndExpenses_33D572913FEA146BABBD6EA88BEA3C6A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_A10B9F438039927CD5646EA88BEA2750" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_246D11B62509365D8A5C6EA88BEA117B" xlink:to="loc_us-gaap_OperatingIncomeLoss_A10B9F438039927CD5646EA88BEA2750" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_B896E65D9AF0D810E1A26EA88BEA4827" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_246D11B62509365D8A5C6EA88BEA117B" xlink:to="loc_us-gaap_ProfitLoss_B896E65D9AF0D810E1A26EA88BEA4827" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_5613C6E76A6DE7E92D836EA88BEB1938" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_246D11B62509365D8A5C6EA88BEA117B" xlink:to="loc_us-gaap_NetIncomeLoss_5613C6E76A6DE7E92D836EA88BEB1938" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_E3CF8C145D90AA5582146EA88BEB8161" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_246D11B62509365D8A5C6EA88BEA117B" xlink:to="loc_us-gaap_EarningsPerShareBasic_E3CF8C145D90AA5582146EA88BEB8161" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_01CF73C8A8CE45E33E8A6EA88BEB1B25" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_246D11B62509365D8A5C6EA88BEA117B" xlink:to="loc_us-gaap_EarningsPerShareDiluted_01CF73C8A8CE45E33E8A6EA88BEB1B25" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/QuarterlyFinancialDataTables" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/ScheduleICondensedBalanceSheetDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_CE69B427E045985A225127C0D4B7F2A8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_StatementTable_CE69B427E045985A225127C0D4B7F2A8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_3E6685F5D1978D2297A327C0D4B85364" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_CE69B427E045985A225127C0D4B7F2A8" xlink:to="loc_dei_LegalEntityAxis_3E6685F5D1978D2297A327C0D4B85364" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_317A036FF9C001BE5F3E27C0D4B8409B_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_3E6685F5D1978D2297A327C0D4B85364" xlink:to="loc_dei_EntityDomain_317A036FF9C001BE5F3E27C0D4B8409B_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_317A036FF9C001BE5F3E27C0D4B8409B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_3E6685F5D1978D2297A327C0D4B85364" xlink:to="loc_dei_EntityDomain_317A036FF9C001BE5F3E27C0D4B8409B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_80B25E7427430B86C4A527C0D4B8157B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_317A036FF9C001BE5F3E27C0D4B8409B" xlink:to="loc_us-gaap_ParentMember_80B25E7427430B86C4A527C0D4B8157B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_3F257A51B12B3832852927C0D4B8AA08" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_CE69B427E045985A225127C0D4B7F2A8" xlink:to="loc_us-gaap_StatementScenarioAxis_3F257A51B12B3832852927C0D4B8AA08" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_C784AF4BA2E755CAC01E27C0D4B81742_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_3F257A51B12B3832852927C0D4B8AA08" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_C784AF4BA2E755CAC01E27C0D4B81742_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_C784AF4BA2E755CAC01E27C0D4B81742" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_3F257A51B12B3832852927C0D4B8AA08" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_C784AF4BA2E755CAC01E27C0D4B81742" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_99CCBF204FEA8A6180B927C0D4B8F044" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_CE69B427E045985A225127C0D4B7F2A8" xlink:to="loc_us-gaap_StatementClassOfStockAxis_99CCBF204FEA8A6180B927C0D4B8F044" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_67F36E4206A0ADA4E13A27C0D4B98DE7_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_99CCBF204FEA8A6180B927C0D4B8F044" xlink:to="loc_us-gaap_ClassOfStockDomain_67F36E4206A0ADA4E13A27C0D4B98DE7_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_67F36E4206A0ADA4E13A27C0D4B98DE7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_99CCBF204FEA8A6180B927C0D4B8F044" xlink:to="loc_us-gaap_ClassOfStockDomain_67F36E4206A0ADA4E13A27C0D4B98DE7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_B38BECB57D4A254BB50127C0D4B990EF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_AssetsCurrentAbstract_B38BECB57D4A254BB50127C0D4B990EF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3BD4643523D91A6E471C27C0D4B9E239" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3BD4643523D91A6E471C27C0D4B9E239" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesReceivableRelatedPartiesCurrent" xlink:label="loc_us-gaap_NotesReceivableRelatedPartiesCurrent_9F32B42C9C3D2359A8C127C0D4B9DF63" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_NotesReceivableRelatedPartiesCurrent_9F32B42C9C3D2359A8C127C0D4B9DF63" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_3B29F18EBD97ED58B0D127C0D4B99003" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_3B29F18EBD97ED58B0D127C0D4B99003" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_8E2DEBCC91F6DAA959A127C0D4B94433" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_AssetsCurrent_8E2DEBCC91F6DAA959A127C0D4B94433" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_EquityinNetAssetsofSubsidiaries" xlink:label="loc_unh_EquityinNetAssetsofSubsidiaries_31EB4C5DD2C5857C96E827C0D4B99D71" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_unh_EquityinNetAssetsofSubsidiaries_31EB4C5DD2C5857C96E827C0D4B99D71" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesReceivableRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_D74E50728D600916412827C0D4B93B29" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_D74E50728D600916412827C0D4B93B29" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_38A2623E193916D5C49827C0D4B96BBF" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_38A2623E193916D5C49827C0D4B96BBF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_A37F73554260304B553727C0D4BAC383" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_Assets_A37F73554260304B553727C0D4BAC383" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_D5B8B52D334D5140FDAD27C0D4BAB022" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_D5B8B52D334D5140FDAD27C0D4BAB022" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_911943190F063EB6225527C0D4BA45A3" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_911943190F063EB6225527C0D4BA45A3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesPayableRelatedPartiesClassifiedCurrent" xlink:label="loc_us-gaap_NotesPayableRelatedPartiesClassifiedCurrent_175B4F708F394C0B779B27C0D4BA070E" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_NotesPayableRelatedPartiesClassifiedCurrent_175B4F708F394C0B779B27C0D4BA070E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_928F6874E06938FFEB1827C0D4BA4B86" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_LongTermDebtCurrent_928F6874E06938FFEB1827C0D4BA4B86" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_5A37C11AA89185BB27FA27C0D4BA81FE" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_LiabilitiesCurrent_5A37C11AA89185BB27FA27C0D4BA81FE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_08C56FF6768FC1B0188727C0D4BAA63A" xlink:type="locator"/>
<definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_LongTermDebt_08C56FF6768FC1B0188727C0D4BAA63A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent_1E8DF6FB9D50A0E45BB427C0D4BA3252" xlink:type="locator"/>
<definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent_1E8DF6FB9D50A0E45BB427C0D4BA3252" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_89B1F885982217DB085627C0D4BA99FE" xlink:type="locator"/>
<definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_Liabilities_89B1F885982217DB085627C0D4BA99FE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_CABF3A236DFB3AB8232A27C0D4BAA22F" xlink:type="locator"/>
<definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_CommitmentsAndContingencies_CABF3A236DFB3AB8232A27C0D4BAA22F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_1DBE81EE546950BB432827C0D4BAFABE" xlink:type="locator"/>
<definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_EquityAbstract_1DBE81EE546950BB432827C0D4BAFABE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_97F06A6467D10B30362927C0D4BB1B43" xlink:type="locator"/>
<definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_PreferredStockValue_97F06A6467D10B30362927C0D4BB1B43" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_D488DF3FD99A1384FD8527C0D4BBA3A2" xlink:type="locator"/>
<definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_CommonStockValue_D488DF3FD99A1384FD8527C0D4BBA3A2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_89C50F4A985DF0859FE927C0D4BB5399" xlink:type="locator"/>
<definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_AdditionalPaidInCapital_89C50F4A985DF0859FE927C0D4BB5399" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_6432C40EB08869CF09A927C0D4BB7ADE" xlink:type="locator"/>
<definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_6432C40EB08869CF09A927C0D4BB7ADE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_077D0D7C00488F4A6F9D27C0D4BB8020" xlink:type="locator"/>
<definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_077D0D7C00488F4A6F9D27C0D4BB8020" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_77B5127E1DBEDABFAF7E27C0D4BBA099" xlink:type="locator"/>
<definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_StockholdersEquity_77B5127E1DBEDABFAF7E27C0D4BBA099" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_D01080B5F5D5EEC9BC9C27C0D4BB99F3" xlink:type="locator"/>
<definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34C5814C441D349B25A427C0D4B96AE8" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_D01080B5F5D5EEC9BC9C27C0D4BB99F3" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ScheduleICondensedBalanceSheetParentheticalDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_4B4839566EA933A2E76C0291A17C1F9E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:to="loc_us-gaap_StatementTable_4B4839566EA933A2E76C0291A17C1F9E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1DAB8650953A64962CA50291A17CF04F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4B4839566EA933A2E76C0291A17C1F9E" xlink:to="loc_dei_LegalEntityAxis_1DAB8650953A64962CA50291A17CF04F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_0F90FD6EB2284851D3FA0291A17D0872_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1DAB8650953A64962CA50291A17CF04F" xlink:to="loc_dei_EntityDomain_0F90FD6EB2284851D3FA0291A17D0872_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_0F90FD6EB2284851D3FA0291A17D0872" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1DAB8650953A64962CA50291A17CF04F" xlink:to="loc_dei_EntityDomain_0F90FD6EB2284851D3FA0291A17D0872" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_96895E4391CE74EDF7D70291A17DE30B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_0F90FD6EB2284851D3FA0291A17D0872" xlink:to="loc_us-gaap_ParentMember_96895E4391CE74EDF7D70291A17DE30B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_0EBDCDB31598200683330291A17D4577" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4B4839566EA933A2E76C0291A17C1F9E" xlink:to="loc_us-gaap_StatementScenarioAxis_0EBDCDB31598200683330291A17D4577" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_BE1BBD737D74F4B22D070291A17DCBA7_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_0EBDCDB31598200683330291A17D4577" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_BE1BBD737D74F4B22D070291A17DCBA7_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_BE1BBD737D74F4B22D070291A17DCBA7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_0EBDCDB31598200683330291A17D4577" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_BE1BBD737D74F4B22D070291A17DCBA7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_77E593AC573B4E02B4390291A17D4E7D" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4B4839566EA933A2E76C0291A17C1F9E" xlink:to="loc_us-gaap_StatementClassOfStockAxis_77E593AC573B4E02B4390291A17D4E7D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_B9E844E1B241F51C49930291A17DA331_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_77E593AC573B4E02B4390291A17D4E7D" xlink:to="loc_us-gaap_ClassOfStockDomain_B9E844E1B241F51C49930291A17DA331_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_B9E844E1B241F51C49930291A17DA331" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_77E593AC573B4E02B4390291A17D4E7D" xlink:to="loc_us-gaap_ClassOfStockDomain_B9E844E1B241F51C49930291A17DA331" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_8C0B706150DAAD69A21D0291A17EE073" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_8C0B706150DAAD69A21D0291A17EE073" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_4C07BE36DA28D23403E10291A17E43E8" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_4C07BE36DA28D23403E10291A17E43E8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_0A10161FCA3ED295AB850291A17F9DE9" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:to="loc_us-gaap_CommonStockSharesIssued_0A10161FCA3ED295AB850291A17F9DE9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_547E874D24099AC2425F0291A17F20D7" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_547E874D24099AC2425F0291A17F20D7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_33D1E5D3EE71A8F7D0490291A17FCBB8" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_33D1E5D3EE71A8F7D0490291A17FCBB8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_1BFEDD8A3BDD860B7BB90291A17FF315" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_1BFEDD8A3BDD860B7BB90291A17FF315" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_01048FF39806BCBCC3C30291A17FC492" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:to="loc_us-gaap_PreferredStockSharesIssued_01048FF39806BCBCC3C30291A17FC492" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_DA374CD469D8850D7DAB0291A17F4510" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E2A8EDC841A96FD42ED00291A17E4080" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_DA374CD469D8850D7DAB0291A17F4510" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ScheduleICondensedCashFlowDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CondensedCashFlowStatementsCaptionsLineItems" xlink:label="loc_us-gaap_CondensedCashFlowStatementsCaptionsLineItems_0F9EAE2FDC956C0CAB342266BC3B7A71" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CondensedCashFlowStatementTable" xlink:label="loc_us-gaap_CondensedCashFlowStatementTable_99494FA5EB5ECDA47CAC2266BC39F103" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CondensedCashFlowStatementsCaptionsLineItems_0F9EAE2FDC956C0CAB342266BC3B7A71" xlink:to="loc_us-gaap_CondensedCashFlowStatementTable_99494FA5EB5ECDA47CAC2266BC39F103" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_69E40E60B731DA0DA3CC2266BC3ACA03" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CondensedCashFlowStatementTable_99494FA5EB5ECDA47CAC2266BC39F103" xlink:to="loc_dei_LegalEntityAxis_69E40E60B731DA0DA3CC2266BC3ACA03" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_B65118A634A4DA0F5FF12266BC3A56F7_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_69E40E60B731DA0DA3CC2266BC3ACA03" xlink:to="loc_dei_EntityDomain_B65118A634A4DA0F5FF12266BC3A56F7_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_B65118A634A4DA0F5FF12266BC3A56F7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_69E40E60B731DA0DA3CC2266BC3ACA03" xlink:to="loc_dei_EntityDomain_B65118A634A4DA0F5FF12266BC3A56F7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_1D65A1A6A1F5B35131172266BC3A4D88" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_B65118A634A4DA0F5FF12266BC3A56F7" xlink:to="loc_us-gaap_ParentMember_1D65A1A6A1F5B35131172266BC3A4D88" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_C75FFFC8079AEFEECDAE2266BC3B6AF9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedCashFlowStatementsCaptionsLineItems_0F9EAE2FDC956C0CAB342266BC3B7A71" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_C75FFFC8079AEFEECDAE2266BC3B6AF9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_A232574E154B275001832266BC3B5F56" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_C75FFFC8079AEFEECDAE2266BC3B6AF9" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_A232574E154B275001832266BC3B5F56" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1F4BAB20A1DE80B011D12266BC3BA847" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedCashFlowStatementsCaptionsLineItems_0F9EAE2FDC956C0CAB342266BC3B7A71" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1F4BAB20A1DE80B011D12266BC3BA847" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OriginationOfNotesReceivableFromRelatedParties" xlink:label="loc_us-gaap_OriginationOfNotesReceivableFromRelatedParties_3BDC13E5D5518EBCDA4E2266BC3CE778" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1F4BAB20A1DE80B011D12266BC3BA847" xlink:to="loc_us-gaap_OriginationOfNotesReceivableFromRelatedParties_3BDC13E5D5518EBCDA4E2266BC3CE778" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RepaymentOfNotesReceivableFromRelatedParties" xlink:label="loc_us-gaap_RepaymentOfNotesReceivableFromRelatedParties_D1D641BBCC16E67695FA2266BC3C4015" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1F4BAB20A1DE80B011D12266BC3BA847" xlink:to="loc_us-gaap_RepaymentOfNotesReceivableFromRelatedParties_D1D641BBCC16E67695FA2266BC3C4015" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_D72C77BD0D39D8D62A8A2266BC3B1035" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1F4BAB20A1DE80B011D12266BC3BA847" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_D72C77BD0D39D8D62A8A2266BC3B1035" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_Capitalcontributionstosubsidiaries" xlink:label="loc_unh_Capitalcontributionstosubsidiaries_55EB7EAE3B7E2F7738122266BC3B96BF" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1F4BAB20A1DE80B011D12266BC3BA847" xlink:to="loc_unh_Capitalcontributionstosubsidiaries_55EB7EAE3B7E2F7738122266BC3B96BF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0301435F23DCE283687A2266BC3BC363" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1F4BAB20A1DE80B011D12266BC3BA847" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0301435F23DCE283687A2266BC3BC363" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedCashFlowStatementsCaptionsLineItems_0F9EAE2FDC956C0CAB342266BC3B7A71" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_F29FA16DE493C29DFCD22266BC3BA19A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_F29FA16DE493C29DFCD22266BC3BA19A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_FED1F27770B86C545D392266BC3CBB9A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_FED1F27770B86C545D392266BC3CBB9A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_60C372119B3806D66E9D2266BC3CC93C" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_60C372119B3806D66E9D2266BC3CC93C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfCommercialPaper" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_1846B2AB36701D7ABDB72266BC3CD4BB" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_1846B2AB36701D7ABDB72266BC3CD4BB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_7241B1395F7DBD8B7D612266BC3C152A" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_7241B1395F7DBD8B7D612266BC3C152A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_450C2DF5026F58434F492266BC3C4852" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_450C2DF5026F58434F492266BC3C4852" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromHedgeFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromHedgeFinancingActivities_936ADBE1F4F15D72FF6C2266BC3C10E7" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_ProceedsFromHedgeFinancingActivities_936ADBE1F4F15D72FF6C2266BC3C10E7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInNotesPayableRelatedPartiesCurrent" xlink:label="loc_us-gaap_IncreaseDecreaseInNotesPayableRelatedPartiesCurrent_1B6255B7EA4CDC4082DB2266BC3CD112" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_IncreaseDecreaseInNotesPayableRelatedPartiesCurrent_1B6255B7EA4CDC4082DB2266BC3CD112" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_3C13D193256508DEB54E2266BC3C4E1C" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_3C13D193256508DEB54E2266BC3C4E1C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_A8E8ADD95841F25888362266BC3D3A1F" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_A8E8ADD95841F25888362266BC3D3A1F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ADF7846FAC53B88B19812266BC3DF034" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ADF7846FAC53B88B19812266BC3DF034" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_BE1DB97B78CBDAB23E372266BC3D00CC" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_F23E6C47B7AF0BC5C5D42266BC3BDCEE" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_BE1DB97B78CBDAB23E372266BC3D00CC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_3328F20F877B828DB45B2266BC3DF119" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedCashFlowStatementsCaptionsLineItems_0F9EAE2FDC956C0CAB342266BC3B7A71" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_3328F20F877B828DB45B2266BC3DF119" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestPaid" xlink:label="loc_us-gaap_InterestPaid_8A6B21D74B39209C61C02266BC3DFBA1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_3328F20F877B828DB45B2266BC3DF119" xlink:to="loc_us-gaap_InterestPaid_8A6B21D74B39209C61C02266BC3DFBA1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_2A398D401113432A48862266BC3D5A78" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_3328F20F877B828DB45B2266BC3DF119" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_2A398D401113432A48862266BC3D5A78" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ScheduleICondensedIncomeStatementDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CondensedIncomeStatementsCaptionsLineItems" xlink:label="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CondensedIncomeStatementTable" xlink:label="loc_us-gaap_CondensedIncomeStatementTable_8E287936408C2B409AA1028CC2AA11C5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_CondensedIncomeStatementTable_8E287936408C2B409AA1028CC2AA11C5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_5BE740B4672676A51917028CC2AA7ED0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CondensedIncomeStatementTable_8E287936408C2B409AA1028CC2AA11C5" xlink:to="loc_dei_LegalEntityAxis_5BE740B4672676A51917028CC2AA7ED0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_66AC4DDF721DAE473FED028CC2AA198C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_5BE740B4672676A51917028CC2AA7ED0" xlink:to="loc_dei_EntityDomain_66AC4DDF721DAE473FED028CC2AA198C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_66AC4DDF721DAE473FED028CC2AA198C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_5BE740B4672676A51917028CC2AA7ED0" xlink:to="loc_dei_EntityDomain_66AC4DDF721DAE473FED028CC2AA198C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_897C4DF74419F6D68751028CC2AA6C44" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_66AC4DDF721DAE473FED028CC2AA198C" xlink:to="loc_us-gaap_ParentMember_897C4DF74419F6D68751028CC2AA6C44" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_86E045DAE73A36FF3A0E028CC2AAEA42" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_RevenuesAbstract_86E045DAE73A36FF3A0E028CC2AAEA42" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentIncomeInterestAndDividend" xlink:label="loc_us-gaap_InvestmentIncomeInterestAndDividend_DBFCF3BBA64F2452570A028CC2AA0E7E" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_InvestmentIncomeInterestAndDividend_DBFCF3BBA64F2452570A028CC2AA0E7E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_FD6555DE6C73CFDE2156028CC2AA5141" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_Revenues_FD6555DE6C73CFDE2156028CC2AA5141" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingCostsAndExpensesAbstract" xlink:label="loc_us-gaap_OperatingCostsAndExpensesAbstract_0F49A03C3123C802749B028CC2AAD0AC" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_OperatingCostsAndExpensesAbstract_0F49A03C3123C802749B028CC2AAD0AC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_01A298394EBC3F55C41E028CC2ABBC68" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_OperatingExpenses_01A298394EBC3F55C41E028CC2ABBC68" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_89C410495E72CE046B49028CC2AB241E" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_InterestExpense_89C410495E72CE046B49028CC2AB241E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_B5A3ADE3F91E01F92F01028CC2ABD01F" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_CostsAndExpenses_B5A3ADE3F91E01F92F01028CC2ABD01F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0607B24827513B66DE88028CC2AB37E5" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0607B24827513B66DE88028CC2AB37E5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_57BD93C1D00D2741F84B028CC2ABC168" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_57BD93C1D00D2741F84B028CC2ABC168" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_LossofParentCompany" xlink:label="loc_unh_LossofParentCompany_F6D853DA95EE081B4C08028CC2ABEC37" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_unh_LossofParentCompany_F6D853DA95EE081B4C08028CC2ABEC37" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_C607E540826DE57D22E4028CC2ACE5FD" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_C607E540826DE57D22E4028CC2ACE5FD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_E632C6792A6D94240F89028CC2AC58B2" xlink:type="locator"/>
<definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_NetIncomeLoss_E632C6792A6D94240F89028CC2AC58B2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A9AB272401DF4E439BCD028CC2AC5F30" xlink:type="locator"/>
<definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A9AB272401DF4E439BCD028CC2AC5F30" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_66DA316B6D5BCACC43F9028CC2AC48A9" xlink:type="locator"/>
<definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedIncomeStatementsCaptionsLineItems_15D1407B122CD46EC0A0028CC2AAE823" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_66DA316B6D5BCACC43F9028CC2AC48A9" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ScheduleIDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_FA85750C766B05C08E47270BC43BEB9B" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_48065A0B156F8456447E270BC4391237" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_FA85750C766B05C08E47270BC43BEB9B" xlink:to="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_48065A0B156F8456447E270BC4391237" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_5F3ECEED33B95C8BACBE270BC43AF6D5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_48065A0B156F8456447E270BC4391237" xlink:to="loc_us-gaap_DebtInstrumentAxis_5F3ECEED33B95C8BACBE270BC43AF6D5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_A8805F4ECE8963A623A7270BC43A16B1_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_5F3ECEED33B95C8BACBE270BC43AF6D5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_A8805F4ECE8963A623A7270BC43A16B1_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_A8805F4ECE8963A623A7270BC43A16B1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_5F3ECEED33B95C8BACBE270BC43AF6D5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_A8805F4ECE8963A623A7270BC43A16B1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_ForeignCorporateDebtSecuritiesMember_1588037F99849FE7D68D270BC43A5A33" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_A8805F4ECE8963A623A7270BC43A16B1" xlink:to="loc_us-gaap_ForeignCorporateDebtSecuritiesMember_1588037F99849FE7D68D270BC43A5A33" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtConversionByUniqueDescriptionAxis" xlink:label="loc_us-gaap_DebtConversionByUniqueDescriptionAxis_6D80AB1AC864E1815E23270BC43A2B8F" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_48065A0B156F8456447E270BC4391237" xlink:to="loc_us-gaap_DebtConversionByUniqueDescriptionAxis_6D80AB1AC864E1815E23270BC43A2B8F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtConversionNameDomain" xlink:label="loc_us-gaap_DebtConversionNameDomain_7E4FCC1DFFC592C49BF0270BC43AD73C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtConversionByUniqueDescriptionAxis_6D80AB1AC864E1815E23270BC43A2B8F" xlink:to="loc_us-gaap_DebtConversionNameDomain_7E4FCC1DFFC592C49BF0270BC43AD73C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtConversionNameDomain" xlink:label="loc_us-gaap_DebtConversionNameDomain_7E4FCC1DFFC592C49BF0270BC43AD73C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtConversionByUniqueDescriptionAxis_6D80AB1AC864E1815E23270BC43A2B8F" xlink:to="loc_us-gaap_DebtConversionNameDomain_7E4FCC1DFFC592C49BF0270BC43AD73C" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ReclassificationofDebtfromShortTermtoLongTermMember" xlink:label="loc_unh_ReclassificationofDebtfromShortTermtoLongTermMember_093D0FFCEE42E68708AB270BC43AD725" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtConversionNameDomain_7E4FCC1DFFC592C49BF0270BC43AD73C" xlink:to="loc_unh_ReclassificationofDebtfromShortTermtoLongTermMember_093D0FFCEE42E68708AB270BC43AD725" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_IntercompanyNoteMember" xlink:label="loc_unh_IntercompanyNoteMember_E0E9C15731D42B65D628270BC43B2BE7" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtConversionNameDomain_7E4FCC1DFFC592C49BF0270BC43AD73C" xlink:to="loc_unh_IntercompanyNoteMember_E0E9C15731D42B65D628270BC43B2BE7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_18058DD4A3B01A81C7AE270BC43B0694" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtConversionNameDomain_7E4FCC1DFFC592C49BF0270BC43AD73C" xlink:to="loc_us-gaap_EquitySecuritiesMember_18058DD4A3B01A81C7AE270BC43B0694" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_FDB90BD74CA29891620A270BC43B2AA9" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_48065A0B156F8456447E270BC4391237" xlink:to="loc_dei_LegalEntityAxis_FDB90BD74CA29891620A270BC43B2AA9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_5AB9796ECC9C49B34CAD270BC43BB3D2_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_FDB90BD74CA29891620A270BC43B2AA9" xlink:to="loc_dei_EntityDomain_5AB9796ECC9C49B34CAD270BC43BB3D2_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_5AB9796ECC9C49B34CAD270BC43BB3D2" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_FDB90BD74CA29891620A270BC43B2AA9" xlink:to="loc_dei_EntityDomain_5AB9796ECC9C49B34CAD270BC43BB3D2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_2F0492C8F0BD94BF2DD2270BC43BE664" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5AB9796ECC9C49B34CAD270BC43BB3D2" xlink:to="loc_us-gaap_ParentMember_2F0492C8F0BD94BF2DD2270BC43BE664" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsidiariesMember" xlink:label="loc_us-gaap_SubsidiariesMember_BF1112267DACBE7AA611270BC43B2359" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5AB9796ECC9C49B34CAD270BC43BB3D2" xlink:to="loc_us-gaap_SubsidiariesMember_BF1112267DACBE7AA611270BC43B2359" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OriginationOfNotesReceivableFromRelatedParties" xlink:label="loc_us-gaap_OriginationOfNotesReceivableFromRelatedParties_7F79AFCB3C5DC81E85BD270BC43B2FFF" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_FA85750C766B05C08E47270BC43BEB9B" xlink:to="loc_us-gaap_OriginationOfNotesReceivableFromRelatedParties_7F79AFCB3C5DC81E85BD270BC43B2FFF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesReceivableRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_C575ABD2ADCEE5755D21270BC43C038A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_FA85750C766B05C08E47270BC43BEB9B" xlink:to="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_C575ABD2ADCEE5755D21270BC43C038A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtConversionOriginalDebtAmount1" xlink:label="loc_us-gaap_DebtConversionOriginalDebtAmount1_7066B35A8E86425A0A24270BC43CBDCF" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_FA85750C766B05C08E47270BC43BEB9B" xlink:to="loc_us-gaap_DebtConversionOriginalDebtAmount1_7066B35A8E86425A0A24270BC43CBDCF" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:label="loc_us-gaap_DebtConversionConvertedInstrumentAmount1_571FA59AC37B55B2DF4F270BC43C24B6" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_FA85750C766B05C08E47270BC43BEB9B" xlink:to="loc_us-gaap_DebtConversionConvertedInstrumentAmount1_571FA59AC37B55B2DF4F270BC43C24B6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries" xlink:label="loc_us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries_6A8974AC108CAA800CDD270BC43CC052" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_FA85750C766B05C08E47270BC43BEB9B" xlink:to="loc_us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries_6A8974AC108CAA800CDD270BC43CC052" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLongTermDebt" xlink:label="loc_us-gaap_OtherLongTermDebt_3690C5FD318D6DA185B9270BC43C47A2" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_FA85750C766B05C08E47270BC43BEB9B" xlink:to="loc_us-gaap_OtherLongTermDebt_3690C5FD318D6DA185B9270BC43C47A2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_E45E95B9E298D4779FE0270BC43C86AB" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_FA85750C766B05C08E47270BC43BEB9B" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_E45E95B9E298D4779FE0270BC43C86AB" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ScheduleIMaturitiesOfCommercialPaperAndLongTermDebtDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_94FDC929556244736D0F029685C7B3B6" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_430341C01CD37D9D8574029685C57D4E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94FDC929556244736D0F029685C7B3B6" xlink:to="loc_us-gaap_DebtInstrumentTable_430341C01CD37D9D8574029685C57D4E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_432DC82BF6977E3744070296869D51EE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_430341C01CD37D9D8574029685C57D4E" xlink:to="loc_dei_LegalEntityAxis_432DC82BF6977E3744070296869D51EE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_8C890166C7B47D01BB69029687DB31BC_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_432DC82BF6977E3744070296869D51EE" xlink:to="loc_dei_EntityDomain_8C890166C7B47D01BB69029687DB31BC_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_8C890166C7B47D01BB69029687DB31BC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_432DC82BF6977E3744070296869D51EE" xlink:to="loc_dei_EntityDomain_8C890166C7B47D01BB69029687DB31BC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_10EF35486010FF29635C029686C3FC5D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_8C890166C7B47D01BB69029687DB31BC" xlink:to="loc_us-gaap_ParentMember_10EF35486010FF29635C029686C3FC5D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleWithinOneYear" xlink:label="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleWithinOneYear_F23CEE9B57AA1448943F029685ED63C5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94FDC929556244736D0F029685C7B3B6" xlink:to="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleWithinOneYear_F23CEE9B57AA1448943F029685ED63C5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleInYearTwo" xlink:label="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleInYearTwo_2E919EBF7CD555538BBD0296860C3BF6" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94FDC929556244736D0F029685C7B3B6" xlink:to="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleInYearTwo_2E919EBF7CD555538BBD0296860C3BF6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentOfPrincipleInYearThree" xlink:label="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentOfPrincipleInYearThree_B4C7E2BA538924C3ED8A02968628CEFA" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94FDC929556244736D0F029685C7B3B6" xlink:to="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentOfPrincipleInYearThree_B4C7E2BA538924C3ED8A02968628CEFA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleInYearFour" xlink:label="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleInYearFour_7FD38805788765BAACB902968647EF5D" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94FDC929556244736D0F029685C7B3B6" xlink:to="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleInYearFour_7FD38805788765BAACB902968647EF5D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleInYearFive" xlink:label="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleInYearFive_E083349CBD20BA168AD0029686642777" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94FDC929556244736D0F029685C7B3B6" xlink:to="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipleInYearFive_E083349CBD20BA168AD0029686642777" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipalAfterYearFive" xlink:label="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipalAfterYearFive_E37253A09880DA1EE243029DE94A5362" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94FDC929556244736D0F029685C7B3B6" xlink:to="loc_us-gaap_FiveYearScheduleOfMaturitiesOfParentCompanyRepaymentsOfPrincipalAfterYearFive_E37253A09880DA1EE243029DE94A5362" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ScheduleINotes" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/ScheduleITables" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_832D7C91EE0917E79C470874A4F6D339" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_D7431DFAF679B4229B540874A4F65C07" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_832D7C91EE0917E79C470874A4F6D339" xlink:to="loc_us-gaap_DebtInstrumentTable_D7431DFAF679B4229B540874A4F65C07" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_CDEF153B19075E08082908FE84F159AE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_D7431DFAF679B4229B540874A4F65C07" xlink:to="loc_dei_LegalEntityAxis_CDEF153B19075E08082908FE84F159AE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_57DEED87D3CA3B9D1A3508FE84F2AB04_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_CDEF153B19075E08082908FE84F159AE" xlink:to="loc_dei_EntityDomain_57DEED87D3CA3B9D1A3508FE84F2AB04_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_57DEED87D3CA3B9D1A3508FE84F2AB04" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_CDEF153B19075E08082908FE84F159AE" xlink:to="loc_dei_EntityDomain_57DEED87D3CA3B9D1A3508FE84F2AB04" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_1439A116BD1B668A126808FEBA5FE423" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_57DEED87D3CA3B9D1A3508FE84F2AB04" xlink:to="loc_us-gaap_ParentMember_1439A116BD1B668A126808FEBA5FE423" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_5827952228264BC1F9480874A4F6DA72" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_D7431DFAF679B4229B540874A4F65C07" xlink:to="loc_us-gaap_StatementScenarioAxis_5827952228264BC1F9480874A4F6DA72" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_E5A050DAD1B64CD5D1CE0874A4F63E1B_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_5827952228264BC1F9480874A4F6DA72" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_E5A050DAD1B64CD5D1CE0874A4F63E1B_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_E5A050DAD1B64CD5D1CE0874A4F63E1B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_5827952228264BC1F9480874A4F6DA72" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_E5A050DAD1B64CD5D1CE0874A4F63E1B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfCondensedBalanceSheetTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfCondensedBalanceSheetTableTextBlock_616B6376B3E825FA35F70874A4F60FDA" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_832D7C91EE0917E79C470874A4F6D339" xlink:to="loc_us-gaap_ScheduleOfCondensedBalanceSheetTableTextBlock_616B6376B3E825FA35F70874A4F60FDA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfCondensedIncomeStatementTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfCondensedIncomeStatementTableTextBlock_40357273AEC1688AB85B0874A4F66DFC" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_832D7C91EE0917E79C470874A4F6D339" xlink:to="loc_us-gaap_ScheduleOfCondensedIncomeStatementTableTextBlock_40357273AEC1688AB85B0874A4F66DFC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfCondensedCashFlowStatementTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfCondensedCashFlowStatementTableTextBlock_9BB14DC82861EF91E7750874A4F61321" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_832D7C91EE0917E79C470874A4F6D339" xlink:to="loc_us-gaap_ScheduleOfCondensedCashFlowStatementTableTextBlock_9BB14DC82861EF91E7750874A4F61321" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_D7E2093E52A7B09A51CA0874A4F65B8D" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_832D7C91EE0917E79C470874A4F6D339" xlink:to="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_D7E2093E52A7B09A51CA0874A4F65B8D" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/SegmentFinancialInformation" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/SegmentFinancialInformationDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E555ACBFD93C867CC7C36EA88C3B81CD" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E555ACBFD93C867CC7C36EA88C3B81CD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorCustomersAxis" xlink:label="loc_us-gaap_MajorCustomersAxis_C3F86B37E444DD11E36B6EA88C409CC3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E555ACBFD93C867CC7C36EA88C3B81CD" xlink:to="loc_us-gaap_MajorCustomersAxis_C3F86B37E444DD11E36B6EA88C409CC3" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaap_NameOfMajorCustomerDomain_568215AF7FA0903374966EA88C40B923_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorCustomersAxis_C3F86B37E444DD11E36B6EA88C409CC3" xlink:to="loc_us-gaap_NameOfMajorCustomerDomain_568215AF7FA0903374966EA88C40B923_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaap_NameOfMajorCustomerDomain_568215AF7FA0903374966EA88C40B923" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorCustomersAxis_C3F86B37E444DD11E36B6EA88C409CC3" xlink:to="loc_us-gaap_NameOfMajorCustomerDomain_568215AF7FA0903374966EA88C40B923" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ExternalCustomersMember" xlink:label="loc_unh_ExternalCustomersMember_56C6C0E2A7835B9FF0F26EA88C40E59B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NameOfMajorCustomerDomain_568215AF7FA0903374966EA88C40B923" xlink:to="loc_unh_ExternalCustomersMember_56C6C0E2A7835B9FF0F26EA88C40E59B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_IntersegmentMember" xlink:label="loc_unh_IntersegmentMember_F7E330CFBF8D59587C576EA88C40C265" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NameOfMajorCustomerDomain_568215AF7FA0903374966EA88C40B923" xlink:to="loc_unh_IntersegmentMember_F7E330CFBF8D59587C576EA88C40C265" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TotalRevenuesMember" xlink:label="loc_unh_TotalRevenuesMember_F898A672E9F732954EB66EA88C410C38" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NameOfMajorCustomerDomain_568215AF7FA0903374966EA88C40B923" xlink:to="loc_unh_TotalRevenuesMember_F898A672E9F732954EB66EA88C410C38" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_C3AABAF27A7CCB8AD81F6EA88C41B1F5" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E555ACBFD93C867CC7C36EA88C3B81CD" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_C3AABAF27A7CCB8AD81F6EA88C41B1F5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_ED854BCD7CAF13A3D0416EA88C417580_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_C3AABAF27A7CCB8AD81F6EA88C41B1F5" xlink:to="loc_us-gaap_SegmentDomain_ED854BCD7CAF13A3D0416EA88C417580_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_ED854BCD7CAF13A3D0416EA88C417580" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_C3AABAF27A7CCB8AD81F6EA88C41B1F5" xlink:to="loc_us-gaap_SegmentDomain_ED854BCD7CAF13A3D0416EA88C417580" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_UnitedhealthcareMember" xlink:label="loc_unh_UnitedhealthcareMember_2D7F4D0A52EAE4E6FA3A6EA88C419EBC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ED854BCD7CAF13A3D0416EA88C417580" xlink:to="loc_unh_UnitedhealthcareMember_2D7F4D0A52EAE4E6FA3A6EA88C419EBC" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TotalOptumMember" xlink:label="loc_unh_TotalOptumMember_6680DBEAE9265AA7AE486EA88C41E2A9" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ED854BCD7CAF13A3D0416EA88C417580" xlink:to="loc_unh_TotalOptumMember_6680DBEAE9265AA7AE486EA88C41E2A9" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_OptumhealthMember" xlink:label="loc_unh_OptumhealthMember_6DEF16A07782C5C05BB76EA88C4175D8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_TotalOptumMember_6680DBEAE9265AA7AE486EA88C41E2A9" xlink:to="loc_unh_OptumhealthMember_6DEF16A07782C5C05BB76EA88C4175D8" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_OptuminsightMember" xlink:label="loc_unh_OptuminsightMember_433D3EA4FB165F6FF4196EA88C41703D" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_TotalOptumMember_6680DBEAE9265AA7AE486EA88C41E2A9" xlink:to="loc_unh_OptuminsightMember_433D3EA4FB165F6FF4196EA88C41703D" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_OptumrxMember" xlink:label="loc_unh_OptumrxMember_B79766B881D963CBF16A6EA88C42600C" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_unh_TotalOptumMember_6680DBEAE9265AA7AE486EA88C41E2A9" xlink:to="loc_unh_OptumrxMember_B79766B881D963CBF16A6EA88C42600C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="loc_us-gaap_IntersegmentEliminationMember_6DB6E861F8895BA52CE56EA88C47284D" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ED854BCD7CAF13A3D0416EA88C417580" xlink:to="loc_us-gaap_IntersegmentEliminationMember_6DB6E861F8895BA52CE56EA88C47284D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PremiumsEarnedNet" xlink:label="loc_us-gaap_PremiumsEarnedNet_967C8D84671768F7C2D86EA88C47D73F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_PremiumsEarnedNet_967C8D84671768F7C2D86EA88C47D73F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_9EA0A09912B2AAF8F7DB6EA88C473EAE" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_SalesRevenueServicesNet_9EA0A09912B2AAF8F7DB6EA88C473EAE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SalesRevenueGoodsNet" xlink:label="loc_us-gaap_SalesRevenueGoodsNet_86DC16A214CD8593DD0F6EA88C479BAD" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_SalesRevenueGoodsNet_86DC16A214CD8593DD0F6EA88C479BAD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_2AB609EE47DF65C45FE56EA88C47853F" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_Revenues_2AB609EE47DF65C45FE56EA88C47853F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentIncomeInterestAndDividend" xlink:label="loc_us-gaap_InvestmentIncomeInterestAndDividend_B58851600CA016457FD16EA88C4794EA" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_InvestmentIncomeInterestAndDividend_B58851600CA016457FD16EA88C4794EA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_71447F26742AE907498F6EA88C47DA89" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_OperatingIncomeLoss_71447F26742AE907498F6EA88C47DA89" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_44258C1D97C288424FE56EA88C476056" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_InterestExpense_44258C1D97C288424FE56EA88C476056" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6403D78A6EAEAB56A8F26EA88C48E937" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6403D78A6EAEAB56A8F26EA88C48E937" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_89B76CCF8DD95A8053966EA88C4895B7" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_Assets_89B76CCF8DD95A8053966EA88C4895B7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_31EAC91929241BB77D0D6EA88C489C2E" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_31EAC91929241BB77D0D6EA88C489C2E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_4795BC7B24E84E55DD366EA88C48E4A4" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AE278FB7815CAFB4BC1A6EA88C4797B9" xlink:to="loc_us-gaap_DepreciationAndAmortization_4795BC7B24E84E55DD366EA88C48E4A4" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/SegmentFinancialInformationSegmentFinancialInformationNarrativeDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_AB5BFCDD19CBB5B588600801B5F6EA18" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FF7ABC011E48ABA7D6150801B5F5D9EB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_AB5BFCDD19CBB5B588600801B5F6EA18" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FF7ABC011E48ABA7D6150801B5F5D9EB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorCustomersAxis" xlink:label="loc_us-gaap_MajorCustomersAxis_665BAD6797CFDB8E59000801B5F5FC0E" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FF7ABC011E48ABA7D6150801B5F5D9EB" xlink:to="loc_us-gaap_MajorCustomersAxis_665BAD6797CFDB8E59000801B5F5FC0E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaap_NameOfMajorCustomerDomain_739E49B4E97C3DA86D430801B5F5A80C_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorCustomersAxis_665BAD6797CFDB8E59000801B5F5FC0E" xlink:to="loc_us-gaap_NameOfMajorCustomerDomain_739E49B4E97C3DA86D430801B5F5A80C_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaap_NameOfMajorCustomerDomain_739E49B4E97C3DA86D430801B5F5A80C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorCustomersAxis_665BAD6797CFDB8E59000801B5F5FC0E" xlink:to="loc_us-gaap_NameOfMajorCustomerDomain_739E49B4E97C3DA86D430801B5F5A80C" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CmsSubsidiesMember" xlink:label="loc_unh_CmsSubsidiesMember_04D2B09FFA041883DBCB0801B5F5F310" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NameOfMajorCustomerDomain_739E49B4E97C3DA86D430801B5F5A80C" xlink:to="loc_unh_CmsSubsidiesMember_04D2B09FFA041883DBCB0801B5F5F310" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_CBA7DC67BD0D62FAEE150801B5F51148" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FF7ABC011E48ABA7D6150801B5F5D9EB" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_CBA7DC67BD0D62FAEE150801B5F51148" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_CDC0A073848BD6ABE6660801B5F52F38_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_CBA7DC67BD0D62FAEE150801B5F51148" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_CDC0A073848BD6ABE6660801B5F52F38_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_CDC0A073848BD6ABE6660801B5F52F38" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_CBA7DC67BD0D62FAEE150801B5F51148" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_CDC0A073848BD6ABE6660801B5F52F38" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_TotalRevenuesMember" xlink:label="loc_unh_TotalRevenuesMember_074052B9F03CBC30C9B50801B5F5EE50" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_CDC0A073848BD6ABE6660801B5F52F38" xlink:to="loc_unh_TotalRevenuesMember_074052B9F03CBC30C9B50801B5F5EE50" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_8C3C6965435AB0A718970801B5F52465" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FF7ABC011E48ABA7D6150801B5F5D9EB" xlink:to="loc_us-gaap_StatementGeographicalAxis_8C3C6965435AB0A718970801B5F52465" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_47B97B2B83D9D3A3D94B0801B5F55E82_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementGeographicalAxis_8C3C6965435AB0A718970801B5F52465" xlink:to="loc_us-gaap_SegmentGeographicalDomain_47B97B2B83D9D3A3D94B0801B5F55E82_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_47B97B2B83D9D3A3D94B0801B5F55E82" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementGeographicalAxis_8C3C6965435AB0A718970801B5F52465" xlink:to="loc_us-gaap_SegmentGeographicalDomain_47B97B2B83D9D3A3D94B0801B5F55E82" xlink:type="arc"/>
<loc xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_US" xlink:label="loc_country_US_230933DD26C5A654459B0801B5F5A029" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_47B97B2B83D9D3A3D94B0801B5F55E82" xlink:to="loc_country_US_230933DD26C5A654459B0801B5F5A029" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_EE83D80F834DB91EE3E50801B5F6DA80" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FF7ABC011E48ABA7D6150801B5F5D9EB" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_EE83D80F834DB91EE3E50801B5F6DA80" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_56F3AB2BE0A237810E520801B5F62793_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_EE83D80F834DB91EE3E50801B5F6DA80" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_56F3AB2BE0A237810E520801B5F62793_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_56F3AB2BE0A237810E520801B5F62793" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_EE83D80F834DB91EE3E50801B5F6DA80" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_56F3AB2BE0A237810E520801B5F62793" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_AmilParticipacoesSAMember" xlink:label="loc_unh_AmilParticipacoesSAMember_8126DB44D5E1ABE1C7120801B5F608C8" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_56F3AB2BE0A237810E520801B5F62793" xlink:to="loc_unh_AmilParticipacoesSAMember_8126DB44D5E1ABE1C7120801B5F608C8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_AF179C17F3C88F94F6010801B5F6F648" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AB5BFCDD19CBB5B588600801B5F6EA18" xlink:to="loc_us-gaap_NumberOfReportableSegments_AF179C17F3C88F94F6010801B5F6F648" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_8C03CF44F3D0EEC173590801B5F69006" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AB5BFCDD19CBB5B588600801B5F6EA18" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_8C03CF44F3D0EEC173590801B5F69006" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_DisclosureonGeographicAreasPercentageofRevenuefromExternalCustomers" xlink:label="loc_unh_DisclosureonGeographicAreasPercentageofRevenuefromExternalCustomers_1A32FD0F0F9053A3CF660801B5F7AC64" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AB5BFCDD19CBB5B588600801B5F6EA18" xlink:to="loc_unh_DisclosureonGeographicAreasPercentageofRevenuefromExternalCustomers_1A32FD0F0F9053A3CF660801B5F7AC64" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_DisclosureonGeographicAreasPercentageofLongLivedAssets" xlink:label="loc_unh_DisclosureonGeographicAreasPercentageofLongLivedAssets_7E81BE70989479DE2F990801B5F71841" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AB5BFCDD19CBB5B588600801B5F6EA18" xlink:to="loc_unh_DisclosureonGeographicAreasPercentageofLongLivedAssets_7E81BE70989479DE2F990801B5F71841" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/SegmentFinancialInformationSegmentFinancialInformationPolicies" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/SegmentFinancialInformationTables" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/ShareBasedCompensation" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D989EC8C87626A36D5ED6E6C1896CE93" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_645DB2E18B47AA69CAA36E6C1895779B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_D989EC8C87626A36D5ED6E6C1896CE93" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_645DB2E18B47AA69CAA36E6C1895779B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_E0D3D607D1D8744EE1906E6C1895735B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_645DB2E18B47AA69CAA36E6C1895779B" xlink:to="loc_us-gaap_RangeAxis_E0D3D607D1D8744EE1906E6C1895735B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_2566847A3565EC4A6D6B6E6C1895E453_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_E0D3D607D1D8744EE1906E6C1895735B" xlink:to="loc_us-gaap_RangeMember_2566847A3565EC4A6D6B6E6C1895E453_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_2566847A3565EC4A6D6B6E6C1895E453" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_E0D3D607D1D8744EE1906E6C1895735B" xlink:to="loc_us-gaap_RangeMember_2566847A3565EC4A6D6B6E6C1895E453" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_EC10E79EE92F778F1C756E6C18957928" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_2566847A3565EC4A6D6B6E6C1895E453" xlink:to="loc_us-gaap_MaximumMember_EC10E79EE92F778F1C756E6C18957928" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_241C2C5B6F4F942F6FC26E6C1895E653" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_2566847A3565EC4A6D6B6E6C1895E453" xlink:to="loc_us-gaap_MinimumMember_241C2C5B6F4F942F6FC26E6C1895E653" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_5D6948D7048D52E0D9586E6C18958930" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_645DB2E18B47AA69CAA36E6C1895779B" xlink:to="loc_us-gaap_AwardTypeAxis_5D6948D7048D52E0D9586E6C18958930" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_277CFFC1F25113E1DC126E6C1895DAAC_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_5D6948D7048D52E0D9586E6C18958930" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_277CFFC1F25113E1DC126E6C1895DAAC_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_277CFFC1F25113E1DC126E6C1895DAAC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_5D6948D7048D52E0D9586E6C18958930" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_277CFFC1F25113E1DC126E6C1895DAAC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_466CF5C0D942133B6AAD6E6C1896E806" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_277CFFC1F25113E1DC126E6C1895DAAC" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_466CF5C0D942133B6AAD6E6C1896E806" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockOptionMember" xlink:label="loc_us-gaap_StockOptionMember_52E30F8F727372B3C1C36E6C189666C9" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_277CFFC1F25113E1DC126E6C1895DAAC" xlink:to="loc_us-gaap_StockOptionMember_52E30F8F727372B3C1C36E6C189666C9" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_EmployeeStockPurchasePlanEsppDomain" xlink:label="loc_unh_EmployeeStockPurchasePlanEsppDomain_5E2F2D5570028A071D2D6E6C189671C7" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_277CFFC1F25113E1DC126E6C1895DAAC" xlink:to="loc_unh_EmployeeStockPurchasePlanEsppDomain_5E2F2D5570028A071D2D6E6C189671C7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_20AD9A3573990273D5D86E6C7C237106" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D989EC8C87626A36D5ED6E6C1896CE93" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_20AD9A3573990273D5D86E6C7C237106" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_77C60D64D5F479D30DC16E6C18960174" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D989EC8C87626A36D5ED6E6C1896CE93" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_77C60D64D5F479D30DC16E6C18960174" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ShareBasedCompensationOtherShareBasedCompensationDataDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D797D7E7B369DF4B443168B73A0F149B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D797D7E7B369DF4B443168B73A0F149B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_01F3BAA9F6726FE4866768B73A104AD9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D797D7E7B369DF4B443168B73A0F149B" xlink:to="loc_us-gaap_AwardTypeAxis_01F3BAA9F6726FE4866768B73A104AD9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CAE768A7A4AA0552976468B73A10BE1B_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_01F3BAA9F6726FE4866768B73A104AD9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CAE768A7A4AA0552976468B73A10BE1B_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CAE768A7A4AA0552976468B73A10BE1B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_01F3BAA9F6726FE4866768B73A104AD9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CAE768A7A4AA0552976468B73A10BE1B" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_StockOptionsAndSarsMemberMember" xlink:label="loc_unh_StockOptionsAndSarsMemberMember_FE8F489F6BC621CD613068B73A10FA85" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CAE768A7A4AA0552976468B73A10BE1B" xlink:to="loc_unh_StockOptionsAndSarsMemberMember_FE8F489F6BC621CD613068B73A10FA85" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_4555B5DD554708B2BA9D68B73A107968" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CAE768A7A4AA0552976468B73A10BE1B" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_4555B5DD554708B2BA9D68B73A107968" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_EmployeeStockPurchasePlanEsppDomain" xlink:label="loc_unh_EmployeeStockPurchasePlanEsppDomain_B124DE1B9CF2E16FBF536961783F02C5" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CAE768A7A4AA0552976468B73A10BE1B" xlink:to="loc_unh_EmployeeStockPurchasePlanEsppDomain_B124DE1B9CF2E16FBF536961783F02C5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_91C6DC20A5730C0FA43168B73A10A2AB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_91C6DC20A5730C0FA43168B73A10A2AB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_9D74F2645A18338B763068B73A101B86" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_9D74F2645A18338B763068B73A101B86" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C42AC3F0DAD551CBBDDB68B73A10CBA8" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C42AC3F0DAD551CBBDDB68B73A10CBA8" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_559A71D6A41AE2C3B36668B73A11648D" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_559A71D6A41AE2C3B36668B73A11648D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_2E2E3C712D96B8525051696144BA16EA" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_2E2E3C712D96B8525051696144BA16EA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_22C1911BD38F40DD826268B73A113BD9" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_ShareBasedCompensation_22C1911BD38F40DD826268B73A113BD9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_C2719FBAE1219333A61068B73A113046" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_C2719FBAE1219333A61068B73A113046" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions_A792739D255779B361C168B73A119599" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions_A792739D255779B361C168B73A119599" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_B6AA6569AAFA1097B83068B73A113866" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_B6AA6569AAFA1097B83068B73A113866" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_24A5D92A59DEDB18477368B73A11E8D2" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C94B25F21D8380A6AC468B73A10C059" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_24A5D92A59DEDB18477368B73A11E8D2" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ShareBasedCompensationRestrictedShareActivityDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6EC038F710E303AFCC3103F40600A26A" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37E6EBAF272F3DB2CEBB03F405FF0ED6" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6EC038F710E303AFCC3103F40600A26A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37E6EBAF272F3DB2CEBB03F405FF0ED6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_6EC92B1FFD8BE6B1B1C603F406005CAB" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37E6EBAF272F3DB2CEBB03F405FF0ED6" xlink:to="loc_us-gaap_AwardTypeAxis_6EC92B1FFD8BE6B1B1C603F406005CAB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C7A6DA3787E436AD30D903F406007289_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_6EC92B1FFD8BE6B1B1C603F406005CAB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C7A6DA3787E436AD30D903F406007289_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C7A6DA3787E436AD30D903F406007289" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_6EC92B1FFD8BE6B1B1C603F406005CAB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C7A6DA3787E436AD30D903F406007289" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_1C26F2EBBDDCF8C2835A03F40600F76A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C7A6DA3787E436AD30D903F406007289" xlink:to="loc_us-gaap_RestrictedStockMember_1C26F2EBBDDCF8C2835A03F40600F76A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6EC038F710E303AFCC3103F40600A26A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_70C4300FFF07E6CCBDC903F40600B558" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_70C4300FFF07E6CCBDC903F40600B558" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_21BE1830F1EFA1ABF0F503F406015779" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_21BE1830F1EFA1ABF0F503F406015779" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_65FC0D1623DE4F17ABD403F40601770A" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_65FC0D1623DE4F17ABD403F40601770A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_737D5DC5C4CA9931303E03F4060142E9" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_737D5DC5C4CA9931303E03F4060142E9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_A160EE02309354C673D903F40601D65D" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_A160EE02309354C673D903F40601D65D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1F3775062AE9D180AEE103F406014A28" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1F3775062AE9D180AEE103F406014A28" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_473146EB67A1ABC993B803F406018FAD" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_473146EB67A1ABC993B803F406018FAD" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_1062981F1299DE3EE8F603F40601CBA1" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2A74533B9854EA57707E03F406001FC0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_1062981F1299DE3EE8F603F40601CBA1" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ShareBasedCompensationShareBasedCompensationPolicies" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/ShareBasedCompensationShareBasedCompensationPrincipalFairValueAssumptionsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_5B9787059BAC77CD162568B739F86071" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_89410BFE01654937C4EB68B739F22CCE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_5B9787059BAC77CD162568B739F86071" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_89410BFE01654937C4EB68B739F22CCE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_54961B1874899C49955F68B739F8D55A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_89410BFE01654937C4EB68B739F22CCE" xlink:to="loc_us-gaap_RangeAxis_54961B1874899C49955F68B739F8D55A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_96CC0EC26317A4A9413E68B739F8A7F9_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_54961B1874899C49955F68B739F8D55A" xlink:to="loc_us-gaap_RangeMember_96CC0EC26317A4A9413E68B739F8A7F9_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_96CC0EC26317A4A9413E68B739F8A7F9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_54961B1874899C49955F68B739F8D55A" xlink:to="loc_us-gaap_RangeMember_96CC0EC26317A4A9413E68B739F8A7F9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_0DDE3FF072F970C5F05C68B739F81DC7" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_96CC0EC26317A4A9413E68B739F8A7F9" xlink:to="loc_us-gaap_MinimumMember_0DDE3FF072F970C5F05C68B739F81DC7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_9C173F4479ED0047D1A068B739F8CA45" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_96CC0EC26317A4A9413E68B739F8A7F9" xlink:to="loc_us-gaap_MaximumMember_9C173F4479ED0047D1A068B739F8CA45" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_21AD688762C0759EE48668B739F8D8A5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5B9787059BAC77CD162568B739F86071" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_21AD688762C0759EE48668B739F8D8A5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_1900A114A2ECF3E1A08268B739F80D2A" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5B9787059BAC77CD162568B739F86071" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_1900A114A2ECF3E1A08268B739F80D2A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_0607033B0299358DF13E68B739F8B3A7" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5B9787059BAC77CD162568B739F86071" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_0607033B0299358DF13E68B739F8B3A7" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_96EC0CC293CCABF43CD268B739F80208" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5B9787059BAC77CD162568B739F86071" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_96EC0CC293CCABF43CD268B739F80208" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_60B29D8D3AC066507F2A68B739F96417" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5B9787059BAC77CD162568B739F86071" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_60B29D8D3AC066507F2A68B739F96417" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures" xlink:label="loc_unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures_5346803ACC2649971CC568B739F94ECB" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5B9787059BAC77CD162568B739F86071" xlink:to="loc_unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures_5346803ACC2649971CC568B739F94ECB" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_971B0A73528E769F0C6568B739F9A315" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5B9787059BAC77CD162568B739F86071" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_971B0A73528E769F0C6568B739F9A315" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ShareBasedCompensationStockOptionAndSarActivityDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_3FAF1478A9DC95957B165CD9E289BC19" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_F0DCBDD274CBD465BF025CD9E28989ED" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_3FAF1478A9DC95957B165CD9E289BC19" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_F0DCBDD274CBD465BF025CD9E28989ED" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_693F1456B87F49F6AD9D5CD9E28937E5" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_F0DCBDD274CBD465BF025CD9E28989ED" xlink:to="loc_us-gaap_PlanNameAxis_693F1456B87F49F6AD9D5CD9E28937E5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_34EDB5CAA450DA2E2DE25CD9E289E9A1_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_693F1456B87F49F6AD9D5CD9E28937E5" xlink:to="loc_us-gaap_PlanNameDomain_34EDB5CAA450DA2E2DE25CD9E289E9A1_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_34EDB5CAA450DA2E2DE25CD9E289E9A1" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_693F1456B87F49F6AD9D5CD9E28937E5" xlink:to="loc_us-gaap_PlanNameDomain_34EDB5CAA450DA2E2DE25CD9E289E9A1" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_EEE117696DF9FD82270B5CD9E289F21E" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_F0DCBDD274CBD465BF025CD9E28989ED" xlink:to="loc_us-gaap_AwardTypeAxis_EEE117696DF9FD82270B5CD9E289F21E" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_64A4D3881A2FE3EB26BF5CD9E2890912_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_EEE117696DF9FD82270B5CD9E289F21E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_64A4D3881A2FE3EB26BF5CD9E2890912_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_64A4D3881A2FE3EB26BF5CD9E2890912" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_EEE117696DF9FD82270B5CD9E289F21E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_64A4D3881A2FE3EB26BF5CD9E2890912" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_5379D743EBD6C671E0075CD9E28937AE" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_F0DCBDD274CBD465BF025CD9E28989ED" xlink:to="loc_us-gaap_StatementClassOfStockAxis_5379D743EBD6C671E0075CD9E28937AE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_5D5A52B503EA2EA217AD5CD9E289D08D_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5379D743EBD6C671E0075CD9E28937AE" xlink:to="loc_us-gaap_ClassOfStockDomain_5D5A52B503EA2EA217AD5CD9E289D08D_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_5D5A52B503EA2EA217AD5CD9E289D08D" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5379D743EBD6C671E0075CD9E28937AE" xlink:to="loc_us-gaap_ClassOfStockDomain_5D5A52B503EA2EA217AD5CD9E289D08D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_B45297D2DEFEC54BB28A5CD9E2896FB0" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_F0DCBDD274CBD465BF025CD9E28989ED" xlink:to="loc_us-gaap_RangeAxis_B45297D2DEFEC54BB28A5CD9E2896FB0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A8F7E617476EA24E3A535CD9E289F027_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_B45297D2DEFEC54BB28A5CD9E2896FB0" xlink:to="loc_us-gaap_RangeMember_A8F7E617476EA24E3A535CD9E289F027_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A8F7E617476EA24E3A535CD9E289F027" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_B45297D2DEFEC54BB28A5CD9E2896FB0" xlink:to="loc_us-gaap_RangeMember_A8F7E617476EA24E3A535CD9E289F027" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ShareBasedCompensationTables" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/ShareholdersEquityShareholdersEquity" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/ShareholdersEquityShareholdersEquityDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_8813864B45734DD31F90042E0B8020D3" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_StatementTable_8813864B45734DD31F90042E0B8020D3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_E17BBCC183B37ED7F802042E0B809A3B" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8813864B45734DD31F90042E0B8020D3" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_E17BBCC183B37ED7F802042E0B809A3B" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_45EA58381A879D3BAA2F042E0B80F7CE_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_E17BBCC183B37ED7F802042E0B809A3B" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_45EA58381A879D3BAA2F042E0B80F7CE_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_45EA58381A879D3BAA2F042E0B80F7CE" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_E17BBCC183B37ED7F802042E0B809A3B" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_45EA58381A879D3BAA2F042E0B80F7CE" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnregulatedOperationMember" xlink:label="loc_us-gaap_UnregulatedOperationMember_9ACB45A1C592FEAC9DB6042E0B81A455" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_45EA58381A879D3BAA2F042E0B80F7CE" xlink:to="loc_us-gaap_UnregulatedOperationMember_9ACB45A1C592FEAC9DB6042E0B81A455" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis" xlink:label="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_0E4EBDD6F3BD67D9E778042E0B811DF5" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8813864B45734DD31F90042E0B8020D3" xlink:to="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_0E4EBDD6F3BD67D9E778042E0B811DF5" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DistributionTypeDomain" xlink:label="loc_us-gaap_DistributionTypeDomain_99538AB29CE80B059A2C042E0B81FAB9_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_0E4EBDD6F3BD67D9E778042E0B811DF5" xlink:to="loc_us-gaap_DistributionTypeDomain_99538AB29CE80B059A2C042E0B81FAB9_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DistributionTypeDomain" xlink:label="loc_us-gaap_DistributionTypeDomain_99538AB29CE80B059A2C042E0B81FAB9" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_0E4EBDD6F3BD67D9E778042E0B811DF5" xlink:to="loc_us-gaap_DistributionTypeDomain_99538AB29CE80B059A2C042E0B81FAB9" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_ExtraordinaryDividendsMember" xlink:label="loc_unh_ExtraordinaryDividendsMember_1915C93B16356EDDCE6F042E0B815966" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionTypeDomain_99538AB29CE80B059A2C042E0B81FAB9" xlink:to="loc_unh_ExtraordinaryDividendsMember_1915C93B16356EDDCE6F042E0B815966" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_AF9527538D4E02118446042E0B811417" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8813864B45734DD31F90042E0B8020D3" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_AF9527538D4E02118446042E0B811417" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_34096E92540C8DD3C2B9042E0B81A99F_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_AF9527538D4E02118446042E0B811417" xlink:to="loc_us-gaap_EquityComponentDomain_34096E92540C8DD3C2B9042E0B81A99F_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_34096E92540C8DD3C2B9042E0B81A99F" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_AF9527538D4E02118446042E0B811417" xlink:to="loc_us-gaap_EquityComponentDomain_34096E92540C8DD3C2B9042E0B81A99F" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments" xlink:label="loc_us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments_1B6096A2A11FE7C375A7042E0B816C1C" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments_1B6096A2A11FE7C375A7042E0B816C1C" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries" xlink:label="loc_us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries_FDC885BDEF839666058D042E0B82B6AA" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries_FDC885BDEF839666058D042E0B82B6AA" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7A48F8DE80629B1CBF4B042E0B821CE6" xlink:type="locator"/>
<definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7A48F8DE80629B1CBF4B042E0B821CE6" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance" xlink:label="loc_us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance_D6E22CAB6EDFECF69AF1042E0B82E406" xlink:type="locator"/>
<definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance_D6E22CAB6EDFECF69AF1042E0B82E406" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired" xlink:label="loc_us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired_340B53997AF33198AA9B042E0B828829" xlink:type="locator"/>
<definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired_340B53997AF33198AA9B042E0B828829" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased" xlink:label="loc_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_ADC9C186A98A7E715050042E0B82419D" xlink:type="locator"/>
<definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_ADC9C186A98A7E715050042E0B82419D" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_DFB5046DC505780A1B65042E0B82E9B9" xlink:type="locator"/>
<definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_DFB5046DC505780A1B65042E0B82E9B9" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_2FD749E410F83837ED40042E0B823BC2" xlink:type="locator"/>
<definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_2FD749E410F83837ED40042E0B823BC2" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_C69F437F6B43AB01211C042E0B8207F0" xlink:type="locator"/>
<definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_C69F437F6B43AB01211C042E0B8207F0" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_C4F31773E77963E2EF09042E0B82CA52" xlink:type="locator"/>
<definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_C4F31773E77963E2EF09042E0B82CA52" xlink:type="arc"/>
<loc xlink:href="unh-20131231.xsd#unh_CashDividendAnnualRatePerShare" xlink:label="loc_unh_CashDividendAnnualRatePerShare_65C37DAA9A0C427691FE042E0B834362" xlink:type="locator"/>
<definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_52F72C4884D789247162042E0B81B92B" xlink:to="loc_unh_CashDividendAnnualRatePerShare_65C37DAA9A0C427691FE042E0B834362" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ShareholdersEquityShareholdersEquityDividendsDetails" xlink:type="extended">
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_7E951920FEF044219AF10446508CE16A" xlink:type="locator"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_B11EE0CD668B707378E30446508A99FC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7E951920FEF044219AF10446508CE16A" xlink:to="loc_us-gaap_StatementTable_B11EE0CD668B707378E30446508A99FC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_24E95397F6BBFD5A3CA70446E4F79453" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_B11EE0CD668B707378E30446508A99FC" xlink:to="loc_us-gaap_StatementScenarioAxis_24E95397F6BBFD5A3CA70446E4F79453" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_57925189F4ABD9DEBEBF0446E4F8E0DC_default" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_24E95397F6BBFD5A3CA70446E4F79453" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_57925189F4ABD9DEBEBF0446E4F8E0DC_default" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_57925189F4ABD9DEBEBF0446E4F8E0DC" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_24E95397F6BBFD5A3CA70446E4F79453" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_57925189F4ABD9DEBEBF0446E4F8E0DC" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockDividendsPerShareCashPaid" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_D6F23AF6DD706BC474380446509F1D8A" xlink:type="locator"/>
<definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7E951920FEF044219AF10446508CE16A" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_D6F23AF6DD706BC474380446509F1D8A" xlink:type="arc"/>
<loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="loc_us-gaap_PaymentsOfDividends_D3733CCCBA7369D75CA1044650D27322" xlink:type="locator"/>
<definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7E951920FEF044219AF10446508CE16A" xlink:to="loc_us-gaap_PaymentsOfDividends_D3733CCCBA7369D75CA1044650D27322" xlink:type="arc"/>
</definitionLink>
<definitionLink xlink:role="http://www.uhc.com/role/ShareholdersEquityShareholdersEquityPolicies" xlink:type="extended"/>
<definitionLink xlink:role="http://www.uhc.com/role/ShareholdersEquityShareholdersEquityTables" xlink:type="extended"/>
</linkbase>


1 Subsequent Filing that References this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 2/15/22  UnitedHealth Group Inc.           10-K       12/31/21  113:19M
Top
Filing Submission 0000731766-14-000008   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
AboutPrivacyRedactionsHelp — Thu., Apr. 18, 2:16:40.2pm ET