Gastroenterology. 405-515-2777. 1125 N. Porter Ave., Suite 301. Norman, OK 73071. Specializes in: Gastroenterology. Certification: Board Certified in Internal Medicine and Gastroenterology. Medical School: Municipal Medical College. Residency: Mount Sinai School of Medicine at Elmhurst Hospital Elmhurst, NY. Fellowship: University of Oklahoma ....