Select Medical Holdings Corp. engages in the provision of medical rehabilitation services. It operates through the following segments: Critical Illness Recovery Hospital, Rehabilitation Hospital, Outpatient Rehabilitation and Concentra. The Critical Illness Recovery Hospital segment serves patients with debilitating injuries and rehabilitation needs that cannot be adequately cared 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 provides physical, occupational, and speech rehabilitation services through its clinics. The Concentra segment operates through its medical centers and contract services provided at employer worksites and Department of Veterans Affairs community-based outpatient clinics, which deliver occupational medicine, physical therapy, veteran's healthcare, and consumer health services. The company was founded by Robert A. Ortenzio and Rocco A. Ortenzio in 1996 and is headquartered in Mechanicsburg, PA.