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. Find doctors and medical staff: edit search filters Close Narrow your search By location Rochester, MN Jacksonville, FL Phoenix/Scottsdale, AZ By last name Find a doctor whose last name begins with the letter A A Find a doctor whose last name begins with the letter B B Find a doctor whose last name begins with the letter C C Find a doctor whose last name begins with the letter D D Find a doctor whose last name begins with the letter E E Find a doctor whose last name begins with the letter F F Find a doctor whose last name begins with the letter G G Find a doctor whose last name begins with the letter H H Find a doctor whose last name begins with the letter I I Find a doctor whose last name begins with the letter J J Find a doctor whose last name begins with the letter K K Find a doctor whose last name begins with the letter L L Find a doctor whose last name begins with the letter M M Find a doctor whose last name begins with the letter N N Find a doctor whose last name begins with the letter O O Find a doctor whose last name begins with the letter P P There are no doctors whose last name begins with the letter Q Q active Find a doctor whose last name begins with the letter R R Find a doctor whose last name begins with the letter S S Find a doctor whose last name begins with the letter T T Find a doctor whose last name begins with the letter U U Find a doctor whose last name begins with the letter V V Find a doctor whose last name begins with the letter W W There are no doctors whose last name begins with the letter X X Find a doctor whose last name begins with the letter Y Y There are no doctors whose last name begins with the letter Z Z Reset all filters Displaying 1-10 out of 10 doctors available Last Name Initial: R Laura E. Raffals, M.D. Gastroenterologist Rochester, MN Areas of focus: Crohn's disease, Ulcerative colitis, Inflammatory bowel disease, Pouchitis Massimo Raimondo, M.D. Gastroenterologist Jacksonville, FL Areas of focus: Endoscopic ultrasound Elizabeth Rajan, M.D. Gastroenterologist Rochester, MN Areas of focus: Balloon assisted endoscopy, Capsule endoscopy, Endoscopic ultrasound, Upper endoscopy 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: Eosinophilic esophagitis, GERD, Achalasia, Esophageal spasms Douglas L. Riegert-Johnson, M.D. Medical Geneticist Internist Gastroenterologist Jacksonville, FL Areas of focus: Cancer Sumera H. Rizvi, M.B.B.S. Gastroenterologist (Transplant Hepatologist) Internist Gastroenterologist Rochester, MN Areas of focus: Hepatocellular carcinoma, Cholangiocarcinoma Lewis R. Roberts, M.B., Ch.B., Ph.D. Gastroenterologist Rochester, MN Areas of focus: Hepatocellular carcinoma Barry G. Rosser, Jr., M.D. Gastroenterologist (Transplant Hepatologist) Internist Jacksonville, FL Areas of focus: Liver transplant, Autoimmune hepatitis, Liver problems Kevin C. Ruff, M.D. Gastroenterologist Phoenix, AZ Areas of focus: Balloon assisted endoscopy, Nutrition (Healthy eating) Request an Appointment at Mayo Clinic Conditions treatedDoctors by location and specialty Nov. 14, 2020 Share on: FacebookTwitter Mayo Clinic in Rochester, Minn., has been recognized as the best Gastroenterology & GI Surgery hospital in the nation for 2020-2021 by U.S. News & World Report. Learn more about this top honor Gastroenterology and HepatologyDepartment homeSectionsRequest an appointmentOverviewTests & proceduresConditions treatedDoctorsDoctors by location and specialtySpecialty groupsExpertise & rankingsLocations, travel & lodgingClinical trialsResearchThe Mayo Clinic experience & patient storiesCosts & insuranceNews from Mayo ClinicResources for medical professionals SectionsRequest an appointmentOverviewTests & proceduresConditions treatedDoctorsDoctors by location and specialtySpecialty groupsExpertise & rankingsLocations, travel & lodgingClinical trialsResearchThe Mayo Clinic experience & patient storiesCosts & insuranceNews from Mayo ClinicResources for medical professionals ORG-20308333 Departments & Centers Medical Departments & Centers Gastroenterology and Hepatology