Catalyst Rx Recipient of 2009 PBMI Rx Benefit Innovation Award.

Pharmacists as Immunization Providers Program Brings Vital Vaccinations to Members

ROCKVILLE, Md. -- Catalyst Rx, the pharmacy benefit management subsidiary of Catalyst Health Solutions, Inc. (NASDAQ:CHSI), has been awarded the Pharmacy Benefit Management Institute's (PBMI) 2009 Rx Benefit Innovation Award with its client partner, New Mexico Public Schools Insurance Authority (NMPSIA). NMPSIA and Catalyst Rx were recognized for their Pharmacists as Immunization Providers vaccination program, which successfully increased immunization rates for NMPSIA's members. This is the second consecutive year that Catalyst Rx has been recognized by PBMI for innovative pharmacy benefit solutions, making Catalyst Rx the first company to win the award in back-to-back years.

"Our 2009 award recipients have differentiated themselves from industry norms with creative new approaches," says Dana H. Felthouse, MBA, president of PBMI. "Another hallmark of the winners is a passion for collaboration among multiple stakeholders. The solutions are programs that demonstrate success in improving pharmaceutical and health care as well as curbing costs."

NMPSIA and Catalyst Rx developed the Pharmacists as Immunization Providers Program, a strategic approach to support pharmacist-administered vaccinations with pre-negotiated pricing, electronic claim adjudication and data tracking. The program, ideally suited for large, rural states, went beyond the traditional model of health care by removing significant barriers to care that were keeping immunization rates low. As a result, more than 29,000 vaccines were administered to more than 15,400 NMPSIA plan participants since July 1, 2006, by New Mexico state-certified pharmacists from more than 120 communities.

"Through this program, NMPSIA members, particularly children, are receiving the vital health care they need within their own communities," said David Blair, Chief Executive Officer of Catalyst Health Solutions. "The future impact of this program is significant because it demonstrates that when obstacles to accessing care are eliminated, individuals and their communities will take part in preventative health measures."

PBMI's Rx Benefit Innovation Awards were presented at its annual Drug Benefit Conference, held March 4 through March 6, 2009, in Phoenix, AZ. The annual Rx Benefit Innovation Award competition is open to all drug benefit plan sponsors, PBMs and health plans, facilitating the sharing of innovative practices among industry stakeholders. Catalyst Rx was a recipient of the award in 2004, as well as in 2008. The Catalyst Rx and NMPSIA Pharmacists as Immunization Providers Program is one of four programs recognized for the award in 2009.

About Pharmacy Benefit Management Institute

The Pharmacy Benefit Management Institute (PBMI) provides research, continuing education, and Web resources that help health care benefit executives work effectively with their pharmacy benefit managers to improve the design and management of drug benefit programs. Learn more at www.pbmi.com.

About Catalyst Rx

Catalyst Rx is a full-service pharmacy benefit management (PBM) company providing innovative, unbiased solutions to manage pharmacy benefit plans for self-insured employers, including state and local governments; third party administrators; managed care organizations; and individuals. Developed around client-centric principles in the management of prescription drug programs, Catalyst Rx manages more than five million members throughout all 50 states and Puerto Rico. The Company's continued commitment to innovation, efficiency and superior customer service provides care- and cost-effective pharmacy solutions to its clients and their members. Founded in 1994 and headquartered in Rockville, Md., Catalyst Rx is a subsidiary of Catalyst Health Solutions, Inc. (NASDAQ: CHSI), online at www.chsi.com.

This press release may contain forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934. These forward-looking statements involve a number of risks and uncertainties. Factors that we have identified that might materially affect our results are discussed in our Annual Report on Form 10-K for the year ended December 31, 2008 under "Item 1.A Risk Factors." Readers are urged to carefully review and consider the various disclosures made in our Annual Report on Form 10-K and our other filings with the Securities and Exchange Commission that attempt to advise interested parties of the risks and uncertainties that may affect our business.