In 1946, Congress passed a law that gave hospitals, nursing homes and other health facilities grants and loans for construction and modernization. In return, they agreed to provide a reasonable volume of services to persons unable to pay and to make their services available to all persons residing in the facility’s area. The program stopped providing funds in 1997, but about 300 health care facilities nationwide are still obligated to provide free or reduced-cost care.

http://www.hrsa.gov/hillburton/