HCA Holdings, Inc., through its subsidiaries, provides health care services in the United States. It operates general, acute care hospitals that offer medical and surgical services, including inpatient care, intensive care, cardiac care, diagnostic, and emergency services; and outpatient services, such as outpatient surgery, laboratory, radiology, respiratory therapy, cardiology, and physical therapy services. The company also operates psychiatric hospitals, which provide therapeutic programs comprising child, adolescent and adult psychiatric care, adult and adolescent alcohol and drug abuse treatment, and counseling. In addition, it operates outpatient health care facilities consisting of freestanding ambulatory surgery centers, freestanding emergency care facilities, diagnostic and imaging centers, comprehensive outpatient rehabilitation and physical therapy centers, outpatient radiation and oncology therapy centers, and various other facilities. As of December 31, 2014, the company operated 166 hospitals, including 162 general acute care hospitals with 42,860 licensed beds; 3 psychiatric hospitals with 396 licensed beds; and 1 rehabilitation hospital, as well as 113 freestanding surgery centers. HCA Holdings, Inc. was founded in 1968 and is headquartered in Nashville, Tennessee.