Rochester Gastroenterology & Associates. Previous Next. Physicians. Dr. Thanaa Al Hamad. Dr. Samir Al-Hadidi. Forms. Missed Appointment/ Cancelation Policy. Billing Info. Financial Policy Policy. HIPPA. Medical Release. Patient Paperwork. Book Your Appointment. Address 1349 South Rochester Road Ste. 210 Rochester Hills, MI 48307. Contacts Phone ....