· Dr. Hrab frequently treats Earwax Buildup, Diverticulitis, Intestinal, and Irritable Bowel Syndrome. See all procedures and conditions Dr. Hrab treats. Where is Dr. Dawn Hrab, MD's office located? Dr. Hrab's office is located at 1835 Maple Rd, Buffalo, NY 14221. Find other locations and directions on Healthgrades..