James L Hartje practicing the study of esophagus, stomach, colon, gallbladder, liver and pancreas in Sioux City, Iowa specializes in gastroenterology services. He is certified by the American Board of Internal Medicine. New patients are welcome for gastroenterology only. Our treatment services are concentrated on adults.James Hartje M.D. is certified by the American Board of Internal Medicine in Internal Medicine and Gastroenterology.Call the office of Dr. James L Hartje to set an appointment today, our phone is answered 24 hours a day.