Select Medical Holdings Corporation operates critical illness recovery hospitals, rehabilitation hospitals, and outpatient rehabilitation clinics in the United States through its subsidiaries. Its Critical Illness Recovery Hospital segment treats conditions such as heart failure, infectious disease, respiratory failure, pulmonary disease, surgery requiring prolonged recovery, renal disease, neurological events, and trauma. The Rehabilitation Hospital segment provides therapy and rehabilitation for brain and spinal cord injuries, strokes, amputations, neurological disorders, orthopedic conditions, pediatric congenital or acquired disabilities, and cancer. The Outpatient Rehabilitation segment offers physical, occupational, and speech rehabilitation programs, as well as specialized programs for work-related injuries, hand therapy, pelvic health, post-concussion rehabilitation, pediatric and cancer rehabilitation, and athletic training. The company was founded in 1996 and is headquartered in Mechanicsburg, Pennsylvania.