Gastrointestinal Care In Derry, Windham, Bedford, Berlin, and Raymond, NH OUR OFFICES This page provides you with practical information about Granite State Gastroenterology. It includes descriptions of our office locations, including directions, hours, appointment scheduling, insurance acceptance, and billing policies. Derry Office6 Tsienneto Road, Suite 301 Derry, NH 03038 Phone: (603) 432 ....