John R. Harper III, M.D. General and Family Medicine » Directory Go back to directory.Add to Address Book.John R. Harper III, M.D. General and Family MedicineJohn R. Harper III, M.D. General and Family MedicineContact: John R. Harper III, M.D.Work 1834 Main St. Ramona CA 92065 workWork Phone: (760) 789-2629workWork Fax: (760) 788-3235workfaxCategories: Health Center, Health Services, Medical, Primary Care DoctorUpdated 12 months ago.