Dr. Constantine Yiachos is a gastroenterologist in Staten Island, New York and is affiliated with multiple hospitals in the area, including Mount Sinai Hospital and Richmond University Medical Center. He received his medical degree from State University of New York Downstate Medical Center College of Medicine and has been in practice for more than 20 years. Dr. Constantine Yiachos has expertise in treating colonoscopy, upper gi endoscopy, inflammatory bowel disease (ibd), among other conditions - see all areas of expertise. Dr. Constantine Yiachos accepts Medicare, Aetna, Cigna, Blue Cross, United Healthcare - see other insurance plans accepted.