Dr. Mark Feldman has been practicing in Belleville, Illinois since 1982. He is board certified in Internal Medicine, Gastroenterology, and Gastrointestinal Endoscopy. He is also a member of the American College of Gastroenterology and the American Society of Gastrointestinal Endoscopy. He has been on the teaching faculty at Southern Illinois University and St. Louis University. He has lectured at the County Medical Society and given Educational Lectures locally and at surrounding community Medical Facilities.