The University of California's five medical centers support the clinical teaching programs of UC's medical and health sciences schools and receive more than 138,000 inpatient discharges, 261,000 emergency room visits and more than 3.6 million outpatient visits each year. The centers provide a full range of health care services in their communities and are sites for the development and testing of new diagnostic and therapeutic techniques. Collectively, these centers comprise one of the largest health care systems in California and one of the two largest Medi-Cal providers in the state. UC's medical centers are located in: Davis, Irvine, Los Angeles, San Diego, San Francisco.