UNIVERSITY OF MARYLAND UPPER CHESAPEAKE HEALTH . HARFORD PRIMARY CARE . BOX HILL OFFICE . 3401 Box Hill Corporate Center Drive Stanley Kman, DO . Suite 100 Peter LoPresti, DO, FACP Abingdon, Maryland 21009 Reuben Abraham, MD . 410-671-0017 (FAX) 410-671-7072 Mary Grace Tanguilan, MD . Patient Portal.