HealthSpring, Inc., through its subsidiaries, operates as a managed care organization in the United States. It focuses primarily on Medicare, the federal government sponsored health insurance program for the U. S. citizens aged 65 and older, qualifying disabled persons, and persons suffering from end stage renal disease in the states of Alabama, Florida, Illinois, Mississippi, Tennessee, and Texas. The company also provides management services to healthcare plans and physician partnerships. In addition, HealthSpring's services include negotiation, monitoring, and quality assurance of contracts with third party healthcare providers; medical management, credentialing, marketing, and product promotion; support services and administration; financial services; and claims processing, and other general business office services. Further, it offers Medicare Part D prescription drug plans to persons who are eligible for Medicare. As of December 31, 2009, the company served approximately 189,000 Medicare members. HealthSpring was founded in 2000 and is headquartered in Franklin, Tennessee.