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Mark Johnston, M.D. is a skilled gastroenterologist currently serving at US Digestive Health since June 2022. Prior to this role, Mark Johnston held significant positions at Lancaster Gastroenterology Inc., where Mark was both a partner and owner from October 2005 until March 2023. Additionally, Mark Johnston contributed to the National Naval Medical Center as Chief of Gastroenterology from July 2003 to September 2005.