Banner Health is a non-profit healthcare system headquartered in Phoenix, Arizona. It was founded in 1999 through the merger of Samaritan Health System and Lutheran Health Systems. Banner Health operates 30 hospitals and several specialized facilities across six states: Arizona, California, Colorado, Nebraska, Nevada, and Wyoming. The system also operates Banner Health Network, a provider network that includes more than 5,000 physicians and other healthcare professionals. Banner Health is the largest employer in Arizona and one of the largest healthcare systems in the United States.