Doctors Mayo Clinic has one of the largest and most experienced practices in the United States, with campuses in Arizona, Florida and Minnesota. Staff skilled in dozens of specialties work together to ensure quality care and successful recovery. 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Even if there are no auto-suggestions within the search field, hit "Search" anyway, as you may still get results. Displaying 1-8 out of 8 doctors available Last Name Initial: R Laura E. Raffals, M.D. Gastroenterologist Rochester, MN Areas of focus: Crohn's disease, Inflammatory bowel disease, Ulcerative colitis, Pouchitis Elizabeth Rajan, M.D. Gastroenterologist Rochester, MN Areas of focus: Upper endoscopy, Endoscopic ultrasound, Capsule endoscopy, Balloon-assisted enteroscopy Francisco C. Ramirez, M.D. Internist Gastroenterologist Phoenix, AZ Areas of focus: Upper endoscopy, Colon cancer Karthik Ravi, M.D. Internist Gastroenterologist Rochester, MN Areas of focus: Gastroesophageal reflux disease, Eosinophilic esophagitis, Achalasia, Esophageal spasms Douglas L. Riegert-Johnson, M.D. Internist Gastroenterologist Medical Geneticist Jacksonville, FL Areas of focus: Colonoscopy, Upper endoscopy, Fecal transplant, Chromoendoscopy, Pancreatic cancer, Lynch syndrome, Familial adenomatou...s polyposis Show more areas of focus for Douglas L. Riegert-Johnson, M.D. Lewis R. Roberts, M.B., Ch.B., Ph.D. Gastroenterologist Rochester, MN Areas of focus: Hepatocellular carcinoma Barry G. Rosser, Jr., M.D. Internist Transplant Hepatologist Jacksonville, FL Areas of focus: Liver transplant, Pre-transplant evaluation, Post-transplant long-term care, Cholangiocarcinoma, Primary sclerosing cho...langitis, Hepatocellular carcinoma, Primary biliary cholangitis, Nonalcoholic fatty liver disease, Cirrhosis, Autoimmune hepatitis, Alcoholic hepatitis, Hepatopulmonary syndrome, Liver disease, Liver cancer, Hepatic encephalopathy Show more areas of focus for Barry G. Rosser, Jr., M.D. Kevin C. Ruff, M.D. Gastroenterologist Phoenix, AZ Areas of focus: Balloon-assisted enteroscopy, Nutrition (Healthy eating) Learn more about the Mayo Clinic Department of Gastroenterology and Hepatology location nearest you: Gastroenterology and Hepatology in Rochester, Minnesota Gastroenterology and Hepatology in Jacksonville, Florida Gastroenterology and Hepatology in Scottsdale, Arizona Request an appointment Conditions treatedDoctors by location and specialty Dec. 05, 2025 Share on: FacebookTwitter Mayo Clinic in Rochester, Minnesota, has been recognized as the best Gastroenterology & GI Surgery hospital in the nation by U.S. News & World Report. Learn more about this top honor Gastroenterology and HepatologyDepartmenthomeSectionsOverviewTests & proceduresConditions treatedDoctorsDoctors by location and specialtySpecialty groupsExpertise & rankingsClinical trialsResearchPatient storiesCosts & insuranceNews from Mayo ClinicReferrals SectionsRequest an AppointmentOverviewTests & proceduresConditions treatedDoctorsDoctors by location and specialtySpecialty groupsExpertise & rankingsClinical trialsResearchPatient storiesCosts & insuranceNews from Mayo ClinicReferrals ORG-20308333 Medical Departments & Centers Gastroenterology and Hepatology