Patient Portal - Gastroenterology Specialists, Inc. › Most Popular Hospitals Newest at www.gsitulsa.com Hospital. Posted: (5 days ago) 10210 East 91st Street South - View Map Tulsa, Ok 74133 (918) 940-8500 (918) 940-8399 (fax) › Hospital Detail: www.gsitulsa.com View Hospital › Get more: Hospital.