HCA Houston Healthcare is the leading provider of health care in the Houston area, and employs 15,000 people serving almost a million patients every year across 13 hospitals, nine outpatient surgery centers, 11 freestanding emergency centers and a dozen freestanding diagnostic imaging facilities in the greater Houston area. It also includes a regional transfer center that provides one-phone-call access and support for patient transfers into and out of HCA-affiliated facilities as well as access to ground and air transportation within a 150-mile radius.