Provider Directory / S / Nathan J. Susnow M.D. Nathan J. Susnow, M.D. Gastroenterology Specialties: Gastroenterology Phone Number: 303-604-5000 Fax: 720-890-0364 Website Link: http://www.gastrorockies.com/about-us/our-providers/nathan-j-susnow Address: Gastroenterology of the Rockies 1755 48th Street, Suite 100, Boulder, CO 80301 Get Directions