Castle Medical Center is a full-service medical center offering a wide range of inpatient, outpatient, and home-based services, Adventist Health Castle (AHCS) is a 160-bed facility with over 1,000 employees and staffed by more than 300 physicians. Located just outside of Kailua, AHCS serves all of O'ahu and is the primary health care facility for the Windward side of the island.