We consent to the use in this Registration Statement on Form S-1 of our report dated
June 22, 2007
(which report expresses an unqualified opinion and includes an explanatory paragraph referring to
the Company’s adoption of Statement of Financial Accounting Standards No. 123 (Revised),
Share
Based Payment and Financial Accounting Standards Board (FASB) Staff Position No. 150-5,
Issuer’s
Accounting under FASB Statement No. 150 for Freestanding Warrants and Other Similar Instruments on
Shares that are Redeemable, effective
January 1, 2006) relating to the consolidated financial
statements of athenahealth, Inc. and subsidiary appearing in the Prospectus, which is part of this
Registration Statement.
