Dr. Deborah L. Hillman is a gastroenterologist in Mount Kisco, New York and is affiliated with Northern Westchester Hospital at Northwell Health. She received her medical degree from New York University Grossman School of Medicine and has been in practice for more than 20 years. Dr. Deborah L. Hillman has expertise in treating colonoscopy, inflammatory bowel disease (ibd), gastroenteritis, among other conditions - see all areas of expertise. Dr. Deborah L. Hillman accepts Medicare, Aetna, Cigna, Blue Cross, United Healthcare - see other insurance plans accepted.