Select Medical Holdings Corp. engages in the provision of medical rehabilitation services. It operates through the following business segments: Critical Illness Recovery Hospital, Rehabilitation Hospital, and Outpatient Rehabilitation. The Critical Illness Recovery Hospital segment serves patients with debilitating injuries and rehabilitation needs that cannot be adequately cared for in a medically intensive environment, such as a skilled nursing facility. The Rehabilitation Hospital segment provides physical medicine, as well as rehabilitation programs and services, which serve to optimize patient health, function, and quality of life. The Outpatient Rehabilitation segment offers physical, occupational, and speech rehabilitation services through its clinics. The company was founded by Robert A. Ortenzio and Rocco A. Ortenzio in 1996 and is headquartered in Mechanicsburg, PA.