Leading gastroenterology practice, N orthern Medical Group G astroenterology Division, formally known as The Digestive Disease Center of the Hudson Valley, has offices in Fishkill, Poughkeepsie, and Highland, New York, where they offer traditional, personalized care for a wide range of gastrointestinal diseases. At the Fishkill location, the center has an accredited and state-certified ...Our Team‧Contact Us‧About Us‧Procedures‧Patient Resources‧Nutrition.