New Search David Winston Kossoff M.D. (301) 624-5566 Department Medicine Specialty Gastroenterology Primary Office Address: Optimal Digestive Care 70 Thomas Johnson Dr Ste 120 Frederick, MD 21702 Phone: (301) 624-5566 Recommend this Physician Get Directions Education Medical School - University of Maryland School of Medicine Internship - The Medical College of Pennsylvania and Hahnemann University Residency - The Medical College of Pennsylvania and Hahnemann University Fellowship - Alleghany University of the Health Sciences Fellowship - Allegheny University of the Health Services Board Certifications American Board of Internal Medicine American Board of Internal Medicine National Board of Physicians and Surgeons