DC, and Maryland. Maryland Children's Health Program MedStar Health Research Institute (MHRI) offers research support for MedStar's medical and instructional services. MedStar offers outpatient pharmacies in the following hospital locations, and also at Leisure World in Silver Spring, Maryland. MedStar Physician Partners is a group of more 100 Primary care physicians. It is part of the MedStar Medical Group that has over 5,600 affiliated physicians and 1,560 employed physicians across Maryland and the Washington, D.C., region. MedStar Surgery Center is a stand-alone multi-specialty surgery center in Downtown Washington, D.C. MedStar Visiting Nurse Association is the largest home healthcare provider in the Maryland, District of Columbia and Northern Virginia region. It provides in-home healthcare services for homebound patients who were recently discharged from the hospital. It also cares for those who are disabled or living with a chronic condition. According to the Centers for Medicare and Medicaid Services' Home Healthcare Compare website, References Medical and health organizations based in Maryland Hospital networks in the United States Privately held companies based in Maryland Health care companies based in Maryland American companies established in 1998 1998 establishments in Maryland Companies based in Columbia, Maryland