OLENTANGY Office | Endoscopy | Infusion Ohio Gastroenterology Group, Inc. 3400 Olentangy River RoadColumbus, Ohio 43202 Practice Operation Manager: Michelle JohnsonNurse Manager: Jenn Waddell Main: 614-754-5500Billing: 614-457-4220Medical Records: 614-754-5455 Download PDF Directions