High Quality Content by WIKIPEDIA articles! Adventist HealthCare is a nonprofit health services organization based in Rockville, Maryland that employs more than 6,500 people and cares for more than 400,000 men, women and children in the community each year among its entities and services. The primary service areas for Adventist HealthCare are the Washington, D.C. metropolitan area and northwestern New Jersey. It is not part of the West Coast based Adventist Health system Adventist Health.