Skip to main content

Department of Internal Medicine

Joseph W. Leung, M.D. View profile as PDF

Joseph W. Leung

Philosophy of Care

To provide the best care for my patient through clinical service, education and development of new (and improved) treatment.

Clinical Interests

Dr. Joseph Leung specializes in all types of gastroenterological conditions. He is one of the leading biliary endoscopists in the United States and well-recognized in Asia for his work on biliary stents and stones.

He pioneered several therapeutic endoscopy techniques including injection hemostasis, urgent nasobiliary drainage and stenting for patients with acute cholangitis.

His research interests focus on design of biliary stents, bacterial biofilm and biliary infection and methods to prevent of biliary sludge and stones formation.

His other clinical and research interests are in colorectal cancer screening using the novel water method. He is interested in teaching endoscopy especially in the use of simulation practice to improve trainees’ clinical ERCP skills.

Research/Academic Interests

Patients with pancreaticobiliary diseases

Teaching novice endoscopists the basic technique of ERCP and biliary intervention. 


Professor of Gastroenterology
Chief of Gastroenterology, VA Northern California Health Care System


Gastroenterology and Hepatology, Internal Medicine, GI Cancer


Internal Medicine


Gastroenterology and Hepatology


UC Davis Medical Group, J Street


UC Davis Medical Center
2315 Stockton Blvd.
Sacramento, CA 95817
Driving Directions
Phone: 800-2-UCDAVIS (800-282-3284)

UC Davis Medical Group - Sacramento (J Street)
Internal Medicine Specialty Clinics
2825 J St., Suite 400
Sacramento, CA 95816
Driving Directions
Phone: 916-734-2737

Additional Phone:

Physician Referrals: 800-4-UCDAVIS (800-482-3284)

Other Languages:



M.D., Chinese University of Hong Kong, Shatin, Hong Kong China 1986
MBBS, University of Hong Kong, Hong Kong China 1975


Surgery, Queen Mary Hospital, Hong Kong China 1975-1976


Queen Mary Hospital , Hong Kong China 1976-1981


Gastroenterology, Middlesex Hospital, London UK 1981-1983

Board Certifications:

Hong Kong Academy of Medicine - Gastroenterology/Hepatology, 2005
Hong Kong College of Physicians - Gastroenterology/Hepatology, 1985
Hong Kong College of Physicians - Internal Medicine, 1984

Professional Memberships:

American College of Gastroenterology
American College of Physicians
American Society for Gastrointestinal Endoscopy
Hong Kong Academy of Medicine
Hong Kong College of Physicians
Royal College of Physicians
Royal College of Physicians and Surgeons of Glasgow

Select Honors and Awards:

Best Doctors in America (Gastroenterology), 2015

Walter Trudeau Excellence in Teaching Award, Division of Gastroenterology, UC Davis, 2015

Visiting Professor, Department of Surgery, Lanzhou University, Lanzhou, China, 2015

California Legislature Resolution Recognition Award, 2015

ASGE Ambassador to Taiwan for ERCP training program, 2012

Master of American College of Gastroenterology, 2010

Select Recent Publications:

Leung J. The feasibility of total water colonoscopy. J Interv Gastroenterol. 2014 Jan;4(1):19-22.

Hu B, Leung JW, Gao DJ, Wang TT, Wu J. Management of benign biliary strictures with a novel retrievable self-expandable metal stent. J Dig Dis. 2014 Mar;15(3):146-53.

Yung VY, Yen AW, Leung JW, Mann SK, Wilson MD, Leung FW. Validation of a novel method for analyzing video recordings of the withdrawal phase of air insufflation and water exchange colonoscopy - documentation of distractions from focused mucosal inspection. J Interv Gastroenterol. 2014 Jan;4(1):8-12.

J Leung, V Vakulchik, J Liu, J Pearcy, A. Yen, F. Leung. Water aided colonoscopy without air insufflation - a comparison of suction removal of infused water during withdrawal versus during insertion. J Interv Gastroenterol 2014; 4(3) Page:63-67.

J Leung, V Vakulchik, A Yen, Y Zavadski, R Silvernail, M Wilson, F Leung. Water exchange significantly reduces the need for abdominal compression during colonoscopy - prospective comparison with air insufflation and water immersion. J Interv Gastroenterol 2014;4(2) Page:40-42.

J Leung, S Mann, R Siao-Salera, C Ngo, R Saroufeem, R McCreery, G Ward, O Abramyan, W Canete, F Li, M. Wilson, F Leung. Water exchange screening colonoscopy with or without indigo carmine in detecting overall and proximal colon adenoma - a randomized controlled trial. J Interv Gastroenterol 2014; 4(1) Page:2-7.

Leung JW, Siao-Salera R, Abramyan O, Mann SK, Ward G, Yen AW, Gutierrez R, Leung FW: Impact of water exchange colonoscopy on serum sodium and potassium levels—an observational study. Dig Dis Sci 2014, March:59:653-657.

Leung FW, Cadoni S, Falt, P, Hsieh Y, Leung JW, Pan Y, Radelli F, Yen AW: Digestive disease week 2014 colonoscopy topic forum—novel methods for polyps detection—state of the art lecture on optimizing polyp detection. J Interv Gastroenterolo 2014;4(2):43-46.

Ocampo LH, Kunkel DC, Yen AW, Tan CR, Leung JW, Leung FW: Underwater hot and cold snare polypectomy can be safely executed during water exchange colonoscopy. J Interv Gastroenterolo, 2013 Jul;3(3):104-106.

J Leung, S Mann, R Siao-Salera, W Canete, D Prather, FW Leung. The Established and Time-Tested Water Exchange Method in Scheduled Unsedated Colonoscopy Significantly Enhanced Patient- Centered Outcomes without Prolonging Procedural Times – A RCT. J Interv Gastroenterol 2013;3:7- 11.

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