athenahealth Retains Top Ranking in Three Ambulatory Billing and Scheduling Categories According to KLAS 2006 Mid-Year Report Card
athenahealth Continues Dominance in the 1-5, 6-25, and 26-100 Physician Practice Segments

WATERTOWN, Mass.--(BUSINESS WIRE)--June 29, 2006--athenahealth, Inc., the premier provider of web-based software, knowledge, and services for medical practices, has retained its number one ranking in three segments of the ambulatory billing and scheduling solutions category of KLAS Enterprises' "Top 20(C): 2006 Mid-Year Report Card": 1-5, 6-25, and 26-100 physicians. athenahealth has led the 6-25 and 26-100 categories since 2004 and took the lead in the 1-5 physician category in 2005. athenahealth out-ranked industry vendors including: Cerner, eClinicalWorks, NextGen Healthcare, Allscripts Healthcare Solutions, Misys Healthcare Systems, and Per-Se Technologies, on a number of performance and business indicators that are most important to providers

"KLAS bases its rankings purely on customer feedback, which athenahealth feels is the only true measure of success," said Jonathan Bush, chairman and chief executive officer of athenahealth. "There is no shortage of industry competition in this category, and we attribute our continued success and industry leadership to the fundamental superiority of our results-driven service model. Packaged software alone ultimately cannot compete with a service like athenahealth's that includes our award-winning web-based software and teams of experienced professionals working with and on behalf of thousands of providers across the nation."

The KLAS Top 20 report summarizes and ranks performance of healthcare solution companies over the past 13 months. Companies included in the KLAS survey must have an available healthcare solution as well as a participating client base large enough to produce statistically significant results. The Mid-Year Report Card reflects healthcare information technology company and product performance data as reported by integrated delivery networks, large clinics and acute care facilities.

About KLAS Enterprises

Founded in 1996, KLAS is the only research and consulting firm specializing in monitoring and reporting the performance of healthcare information technology (HIT) vendors and products. KLAS strives to improve HIT delivery by independently measuring vendor performance for the benefit of consultants, investors, vendors, and healthcare provider partners. KLAS, in concert with thousands of healthcare executives and professionals, has created a dynamic database of HIT evaluations and opinions of healthcare executives, managers, and clinicians from over 4500 hospitals and 3,000 clinics are represented in the reports, 300+ software vendors, 500+ software products and 35 service firms. The Top 20 Report reflects the summary of HIT product performance data collected over a 13-month period. For further information, contact KLAS Enterprises, LLC at 801-226-5120 or on the Web at www.healthcomputing.com.

About athenahealth

athenahealth provides the only physician revenue and clinical cycle management offering that integrates web-based practice management and EMR software, continually updated payer knowledge, and back office processing specialists into a single service. The results are faster payment at lower cost, improved patient care, higher revenue retention and less hassle for the more than 7,000 providers using athenahealth nationwide. The company collects nearly $2 billion on behalf of its clients annually. athenahealth is dedicated to helping providers make optimum use of their time, ultimately improving the quality of service delivered and the financial reward for it. For more information about athenahealth, visit ourWeb site at www.athenahealth.com or call 1-888-652-8200..

Contacts
athenahealth
John Hallock, 617-402-1428
Manager, Public Relations
jhallock@athenahealth.com