Dr Markham L Nightengale, M.D.

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Adult Gastroenterology Associates (AGA) is a single specialty gastroenterology and hepatology (liver disease) practice that comprises eleven physicians with three office locations in Tulsa and multiple satellite locations servicing much of Northeastern Oklahoma. For 30 years, AGAs Board Certified, fellowship trained physicians have been the experts in all aspects of their specialties, including colon cancer screening procedures, treatment of GERD, inflammatory bowel disease, irritable bowel syndrome and treatment of diseases of the liver and pancreas.Discover all the reasons Adult Gastroenterology Associates is the best choice for your digestive health care.