Patient Portal; Home/ Locations/ Our Locations/ Northwest Gastroenterology - Bentonville ... Northwest Gastroenterology - Bentonville 2900 Medical Center Pkwy. | Suite 220 Bentonville, AR 72712 Phone: (479) 757-8150 Fax: (479) 553-1945 Directions. Hours: Monday - Thursday: 8 a.m. - 5 p.m..