An ambulatory health care program (defined under section 330 of the Public Health Service Act) usually serving a catchment area which has scarce or nonexistent health services or a population with special health needs; sometimes known as the neighborhood health center. Community Health Centers attempt to coordinate federal, state and local resources into a single organization capable of delivering both health and related social services to a defined population. While such a center may not directly provide all types of health care, it usually takes responsibility to arrange all medical services needed by its patient population.