David Tze-Yan, Wong MD, Ph.D.Attending PhysicianGastroenterology Internal Medicine Education: Albert Einstein College of MedicineMain Office:925-275-9966 Tri Valley Gastroenterology 5801 Norris Canyon Rd San Ramon, CA 94583 Certification: Board Certified in Gastroenterology, Internal Medicine Additional Office: 2121 Ygnacio Valley Road Suite E200, Walnut Creek, CA 94598