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Dr. Johannes Koch is a gastroenterologist practicing in Seattle, WA. Dr. Koch specializes in the digestive system and its diseases that affect the gastrointestinal tract, which include organs from the mouth to the anus as well as liver disorders. Gastroenterology includes conditions such as hepatitis, peptic ulcer disease, colitis, nutritional problems and irritable bowel syndrome. Dr. Koch performs colonoscopy and endoscopy procedures and provides accurate and thorough care for patients suffering from digestive issues.