Select Medical Holdings Corporation, through its subsidiary, Select Medical Corporation, operates critical illness recovery hospitals, rehabilitation hospitals, outpatient rehabilitation clinics, and occupational health centers in the United States. It operates through four segments: Critical Illness Recovery Hospital, Rehabilitation Hospital, Outpatient Rehabilitation, and Concentra. The Critical Illness Recovery Hospital segment consists of hospitals that provide services for heart failure, infectious disease, respiratory failure and pulmonary disease, surgery requiring recovery, renal disease, neurological events, and trauma. The Rehabilitation Hospital segment offers therapy and rehabilitation treatments, including rehabilitative services for brain and spinal cord injuries, strokes, amputations, neurological disorders, orthopedic conditions, pediatric congenital or acquired disabilities, and cancer. The Outpatient Rehabilitation segment operates rehabilitation clinics that provide physical, occupational, and speech rehabilitation programs and services; and specialized programs, such as functional programs for work related injuries, hand therapy, post-concussion rehabilitation, and athletic training services. The Concentra segment operates and provides medical centers and contract services at employer worksites and Department of Veterans Affairs community-based outpatient clinics (CBOCs) that deliver occupational medicine, consumer health, physical therapy, and veteran's healthcare services. As of December 31, 2018, the company operated 96 critical illness recovery hospitals in 27 states; 26 rehabilitation hospitals in 11 states; 1,662 facilities in 37 states and the District of Columbia; and 524 occupational health centers, 124 onsite clinics at employer worksites, and 31 Department of Veterans Affairs CBOCs in 44 states. Select Medical Holdings Corporation was founded in 1996 and is headquartered in Mechanicsburg, Pennsylvania.