ATHENAHEALTH TO RELEASE 2008 PAYERVIEW(SM) RANKINGS

athenahealth Chairman and CEO to Discuss New Rankings on CNBC’s “Squawk Box”

WATERTOWN, Mass. (May 28, 2008) – athenahealth, Inc., (Nasdaq: ATHN)

WHAT: athenahealth, Inc., (Nasdaq: ATHN) will release its 2008 PayerView Rankings tomorrow, May 29th, 2008.

WHEN: CNBC Broadcast airs Thursday, May 29th at approximately 7:25 a.m. EDT

WHO:

— athenahealth Chairman and CEO, Jonathan Bush, will appear in-studio on CNBC’s morning business show “Squawk Box” to discuss the new 2008 rankings.

— Mr. Bush will be joined by the Chairman and CEO of this year’s new number one ranked national health insurer during the broadcast to address their efforts to improve their performance on the PayerView Rankings and business dealings with physicians.

— The 2008 PayerView Rankings leverage claims performance data from more than 12,000 medical providers representing over 30 million medical charge lines for all four quarters in 2007. The PayerView data is derived from athenahealth’s on-demand athenaNet(R) practice management system database, and ranks national, regional and government health insurers according to specific measures of financial, administrative performance, and medical policy complexity associated with their payment performance with physicians.

WEBSITE: The complete 2008 PayerView Rankings for national, regional and government payers will be updated on May 29th and available to the public at www.athenaPayerView.com.

Source: athenahealth