Ronald K. Hsu, M.D., F.A.C.G., A.G.A.F., F.A.S.G.E., F.A.C.P., F.R.C.P. (Lon), F.R.C.P. (Edin), F.H.K.C.P., F.H.K.A.M. for UC Davis Health

Ronald K. Hsu, M.D., F.A.C.G., A.G.A.F., F.A.S.G.E., F.A.C.P., F.R.C.P. (Lon), F.R.C.P. (Edin), F.H.K.C.P., F.H.K.A.M.

Governor for Northern California, American College of Gastroenterology

Clinical Professor, Department of Medicine

To see if Ronald K. Hsu is accepting new patients, or for assistance finding a UC Davis doctor, please call 800-2-UCDAVIS (800-282-3284).




Advanced Therapeutic Endoscopy


Internal Medicine

Locations and Contact

UC Davis Medical Center

UC Davis Medical Center
2315 Stockton Blvd.
Sacramento, CA 95817

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Additional Numbers

Physician Referrals

800-4-UCDAVIS (800-482-3284)

Philosophy of Care

I always try my very best to ensure every patient do better after seeing me.
 I also appreciate each individual patient as an inspiration to learn and enhance my clinical judgement to help future patients.

Clinical Interests

Dr. Ronald Hsu is a Gastroenterologist and Advanced Therapeutic Endoscopist. He has special skills in Endoscopic Eradication Therapy for Barrett’s esophagus and Dysplasia, Radiofrequency Ablation, Endoscopic Mucosal Resection, Endoscopic Retrograde Cholangiopancreatography for pancreaticobiliary diseases, Fecal Microbiota Transplantation, Endoscopic Therapy for Gastrointestinal Cancers. His clinical interests include the management of Inflammatory Bowel Disease, Gut Microbiome in Health and Disease, Clostridiodes difficile Infections, Prevention of Colorectal Cancer, Management and Prevention of Esophageal Cancer, Barrett’s Esophagus, Pancreatobiilairy Disease. He directs educational conferences and community outreach programs.

Research/Academic Interests

Dr. Hsu’s research focuses on the gut microbiome in health and disease; the use of fecal microbrial  transplanation in Clostridiodes Difficile Infection. He particpates in clinical trials for multiple gastrointestinal dieseaes including inflammatory bowel disease, colon cancer prevention and other digestive diseases. He directs educaioinal conferences and community outreach programs.


Gastroenterology and Hepatology

Other School

M.B., B.Ch., University of Wales, College of Medicine, Cardiff, Wales, UK 1985


General Medicine and Surgery, University Hospital of Wales, Cardiff, Wales, UK 1985-1986


Internal Medicine, California Pacific Medical Center, San Francisco CA 1987-1989


Gastroenterology, Hepatology, & Advanced Therapeutic Endoscopy, UC Davis Medical Center, Sacramento CA 1991-1994

Top Doctors, Sacramento Magazine and Castle Connolly Award 2017, 2018, 2019, 2020, 2021, 2022, 2023

Service Award for Colorectal Cancer Outreach, Prevention & Year Round Excellent (SCOPY), American College of Gastroenterology, 2016, 2017, 2018, 2019, 2020, 2021, 2022

Ambulatory Surgery Center of the Year Award, California Ambulatory Surgery Association (Medical Director for Sutter Roseville Endoscopy Center), 2022

American College of Gastroenterology Board of Governor’s Service Award, 2021

Honoree for Achievement in Endoscopy Education by American Society of Gastrointestinal Endoscopy, 2013, 2014

Shao T, Hsu R, Hacein-Bey C, Zhang W, Gao L, Kurth MJ, Zhao H, Shuai Z, Leung PSC. The Evolving Landscape of Fecal Microbial Transplantation. Clin Rev Allergy Immunol. 2023 Feb 9:1–20. doi:10.1007/s12016-023-08958-0. Epub ahead of print. PMID:36757537.

Kelly CR, Yen EF, Grinspan AM, Kahn SA, Atreja A, Lewis JD, Moore TA, Rubin DT, Kim AM, Serra S, Nersesova Y, Fredell L, Hunsicker D, McDonald D, Knight R, Allegretti JR, Pekow J, Absah I, Hsu R, Vincent J, Khanna S, Tangen L, Crawford CV, Mattar MC, Chen LA, Fischer M, Arsenescu RI, Feuerstadt P, Goldstein J, Kerman D, Ehrlich AC, Wu GD, Laine L. Fecal Microbiota Transplantation Is Highly Effective in Real-World Practice: Initial Results From the FMT National Registry. Gastroenterology. 2021 Jan;160(1):183-192.e3. doi:10.1053/j.gastro.2020.09.038. Epub 2020 Oct 1. PMID:33011173.

R. Hsu. Chapter editor for Crohn’s disease and Ulcerative Colitis. StatPearls On-line peer reviewed. 2016.

Hsu R, Stollman N. Fecal Microbiota Transplantation. Patient Education Web Chapter. Am College Gastroenterol. 2016.

Hsu RK, Yu A, Lee JG, Leung JW. Pancreatitis caused by common bile duct stones in a 3-year-old boy with prior surgery for a choledochal cyst. Am J Gastroenterol. 2001 Jun;96(6):1919-21. doi:10.1111/j.1572-0241.2001.03894.x. PMID:11419850.

Hsu RK, Draganov P, Leung JW, Tarnasky PR, Yu AS, Hawes RH, Cunningham JT, Cotton PB. Therapeutic ERCP in the management of pancreatitis in children. Gastrointest Endosc. 2000 Apr;51(4 Pt 1):396-400. doi:10.1016/s0016-5107(00)70437-8. PMID:10744808.

Lee JG, Hsu R, Leung JW. Are self-expanding metal mesh stents useful in the treatment of benign esophageal stenoses and fistulas? An experience of four cases. Am J Gastroenterol. 2000 Aug;95(8):1920-5. doi:10.1111/j.1572-0241.2000.02246.x. PMID:10950036.

Lee JG, Turnipseed S, Romano PS, Vigil H, Azari R, Melnikoff N, Hsu R, Kirk D, Sokolove P, Leung JW. Endoscopy-based triage significantly reduces hospitalization rates and costs of treating upper GI bleeding: a randomized controlled trial. Gastrointest Endosc. 1999 Dec;50(6):755-61. doi:10.1016/s0016-5107(99)70154-9. PMID:10570332.

Sung JJ, Hsu RK, Chan FK, Liew CT, Lau JW, Li AK. Crohn's disease in the Chinese population. An experience from Hong Kong. Dis Colon Rectum. 1994 Dec;37(12):1307-9. doi:10.1007/BF02257802. PMID:7995164.

Hsu RK, Lai CW, Lo KK, Leung JWC. Mucin secreting cholangiocarcinoma associated with Clonorchiasis. Digestive Endoscopy. 1992;4:456-459.