Internal Medicine, Gastroenterology in LANCASTER, PA
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Mark H Johnston, MD, is a physician specializing in Internal Medicine and Gastroenterology based in Lancaster, PA.
Generated from public NPI Registry data only. Not independently verified — confirm credentials directly with the practice.
MARK H JOHNSTON specializes in Internal Medicine, Gastroenterology.
MARK H JOHNSTON practices in LANCASTER, PA.
MARK H JOHNSTON's NPI number is 1003898131.