San Francisco General Hospital (SFGH) is the main public hospital in San Francisco, California, and the only Level I Trauma Center for the 1.5 million residents of San Francisco and northern San Mateo County. The hospital serves poor, elderly people, uninsured working families, and immigrants. About 80 percent of its patient population either receives publicly funded health insurance (Medicare or Medi-Cal) or is uninsured. SFGH also cares for the homeless, who make up about 8 percent of its patients. It is the largest acute inpatient and rehabilitation hospital for psychiatric patients in the City.