Caremark Rx, Inc., through its subsidiaries, provides pharmaceutical services in the United States. The company’s pharmaceutical services, generally referred to as pharmacy benefit management services, involve the design and administration of programs for prescription drug use. The company dispenses pharmaceuticals to eligible participants in benefit plans maintained by its customers; and utilizes its information systems to perform safety checks, drug interaction screening, and generic substitution. Its CarePatterns and Accordant disease management programs cover approximately 20 diseases, including asthma, coronary artery disease, congestive heart failure, diabetes, hemophilia, rheumatoid arthritis, and multiple sclerosis. It provides prescription drugs both directly, through its own mail service pharmacies, and indirectly through a network of third-party retail pharmacies. The company operated 7 automated mail service pharmacies and 21 smaller regional mail service pharmacies, as of December 31, 2004. Caremark’s services enable employers, insurance companies, unions, government employee groups, managed care organizations, and other sponsors of health benefit plans and individuals throughout the United States in delivering prescription drugs. Caremark Rx was organized in 1993 and was formerly known as MedPartners, Inc. The company is headquartered in Nashville, Tennessee.