Dr. Sadia N Ahmed has 3 locations. Suburban Rheumatology Medical Group 9 Limestone Dr Williamsville, NY 14221. (716) 626-4200. ACCEPTING NEW PATIENTS. Suburban Rheumatology 8207 Main St Ste 7&8 Williamsville, NY 14221. (716) 626-4200. ACCEPTING NEW PATIENTS. Catholic Health 8207 Main St Ste 7 Williamsville, NY 14221. (716) 626-4200..