Olentangy 3400 Olentangy River Road Columbus, Ohio 43202 Ohio Gastro Office 1st Floor (Right) Doctor Appointments, Office Visits, & Hemorrhoid Banding Central Ohio Endo. Center 1st Floor (Left) Procedures (eg. colonoscopy, endoscopy) Infusion 2nd Floor Main: 614-754-5500 Billing: 614-457-4220 Medical Records: 614-754-5455 Open PDF Directions