Vanguard Health Systems, Inc. owns and operates acute care and specialty hospitals, and outpatient facilities in urban and suburban markets in the United States. The company’s general acute care and specialty hospitals offers various medical and surgical services, including emergency services, general surgery, internal medicine, cardiology, obstetrics, orthopedics, and neurology, as well as tertiary services, such as open-heart surgery, advanced neurosurgery, children’s specialty, level II and III neonatal intensive care, and level 1 trauma. Its facilities also provides on-campus and off-campus outpatient and ancillary services comprising outpatient surgery, physical therapy, rehabilitation, radiation therapy, diagnostic imaging, and laboratory services, as well as offers outpatient services at its imaging centers and ambulatory surgery centers. As of June 30, 2012, the company owned and operated 28 acute care hospitals with a total of 7,064 licensed beds, and related outpatient service facilities complementary to the hospitals in San Antonio, Harlingen, and Brownsville, Texas; metropolitan Detroit, Michigan; metropolitan Phoenix, Arizona; metropolitan Chicago, Illinois; and Massachusetts, as well as 2 surgery centers in Orange County, California. In addition, it operates 4 managed care health plans, which include Phoenix Health Plan, a Medicaid managed health plan in Arizona; Abrazo Advantage Health Plan, a managed Medicare and dual-eligible health plan in Arizona; Chicago Health Systems, a preferred provider network in metropolitan Chicago that covers outpatient and physician services; and Valley Baptist Insurance Company that offers health maintenance organization and preferred provider organization products to primarily government-related organizations in south Texas. The company was founded in 1997 and is headquartered in Nashville, Tennessee.