Prison inmates can't really shop around for health plans, but depending on where they are held, they may have access to Correctional Medical Services (CMS). More than a quarter of a million incarcerated people rely on CMS, which operates medical units in more than 300 prisons and jails in roughly 20 states across the US. Its 6,000 doctors, nurses, and other medical providers administer primary and specialty medical care (including dental care, mental health and substance abuse services), pharmacy services, and medical records management. The company has statewide health care contracts with more than 10 state prison systems. Privately held Corizon owns CMS.