Dr. Tommy Tiong-Hien Oei is a board-certified gastroenterologist in Fontana, CA. He earned his medical degree from the New York University School of Medicine, New York. Dr. Tommy finished his fellowship in Gastroenterology at Los Angeles County/the University of Southern California. He specializes in performing advanced endoscopy procedures includes Endoscopic Retrograde Cholangiopancreatography. Dr. Tommy delivers exceptional GI care to his patients. His practice is also available in Ontario, CA.

Dr. Nehali Patel is a highly skilled and compassionate gastroenterologist in Fontana, CA. She holds board certifications in internal medicine and gastroenterology. Dr. Nehali graduated from Albany Medical College. Dr. Nehali finished her internal medicine residency at the University of Florida College of Medicine, Gainesville. She did her gastroenterology fellowship at the University of Arizona College of Medicine, Tucson. Dr. Nehali provides treatment for all gastrointestinal disorders of her patients. She also practices at Ontario Medical Center.

Dr. Zhigang Song is a well-known gastroenterologist in Fontana who graduated from Shandong Medical College. Dr. Zhigang finished his gastroenterology fellowship at Columbia Presbyterian Medical Center, New York. He has special interests in performing therapeutic endoscopy procedures. He provides treatment for inflammatory bowel disease, celiac disease, viral hepatitis, and fatty liver disease. Dr. Zhigang uses state-of-the-art equipment and procedures. His goal is to work with patients collaboratively to offer the highest quality of patient care possible.