HCA Holdings, Inc., through its subsidiaries, provides health care services in the United States. The company owns, manages, or operates hospitals, freestanding surgery centers, diagnostic and imaging centers, radiation and oncology therapy centers, rehabilitation and physical therapy centers, and various other facilities. Its general acute care hospitals provide medical and surgical services, including inpatient care, intensive care, cardiac care, diagnostic services, and emergency services, as well as outpatient services comprising outpatient surgery, laboratory, radiology, respiratory therapy, cardiology, and physical therapy; and psychiatric hospitals offer therapeutic programs, such as child, adolescent, and adult psychiatric care, as well as adult and adolescent alcohol and drug abuse treatment and counseling. The company's general, acute care hospitals provide a range of services to accommodate medical specialties, such as internal medicine, general surgery, cardiology, oncology, neurosurgery, orthopedics, and obstetrics. As of December 31, 2012, the company operated 162 hospitals comprising 156 general, acute care hospitals, 5 psychiatric hospitals, and 1 rehabilitation hospital, as wells 112 freestanding surgery centers in 20 states and England. HCA Holdings, Inc. was founded in 1968 and is headquartered in Nashville, Tennessee.