Welcome to the Upper East Side Gastroenterology section containing gastroenterologists in 10022, 10065, 10021, 10075, 10028 and 10128 zip codes. Gastroenterologists diagnose and treat disorders of the digestive system, including the stomach, bowels, liver, gallbladder and related organs. They treat conditions such as abdominal pain, ulcers, diarrhea, and cancer. Gastroenterologists perform complex diagnostic and therapeutic procedures, and they consult with surgeons when abdominal operations are needed. Gastroenterology is a subspecialty of internal medicine. Be sure to hold your mouse over any bold-italicized listings for a special pop-up description.