HCA Healthcare, Inc., through its subsidiaries, operates as a health care services company in the United States. The company 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. It also operates psychiatric hospitals, which provide therapeutic programs comprising child, adolescent and adult psychiatric care, and adolescent and adult alcohol and drug abuse treatment and counseling. In addition, the company operates outpatient health care facilities consisting of freestanding ambulatory surgery centers, freestanding emergency care facilities, urgent care facilities, walk-in clinics, diagnostic and imaging centers, rehabilitation and physical therapy centers, radiation and oncology therapy centers, physician practices, and various other facilities. As of December 31, 2020, it operated 185 hospitals, which included 178 general, acute care hospitals, as well as five psychiatric hospitals and two rehabilitation hospitals; 121 freestanding surgery centers; and 21 freestanding endoscopy centers in 20 states and England. The company was formerly known as HCA Holdings, Inc. HCA Healthcare, Inc. was founded in 1968 and is headquartered in Nashville, Tennessee.