Mark D. Derleth
Clinical Associate Professor
Director, Gastroenterology Fellowship Program
Division of Gastroenterology

Faculty Information


Mark Derleth, M.D., is a board-certified gastroenterologist at University of Washington Medical Center (UWMC).  He sees patients in the Digestive Health Center and the Adult Cystic Fibrosis Clinic.

Dr. Derleth believes that good communication is a crucial part of providing good care to patients. He strives to understand patients’ concerns and expectations so that he can best assist them.

Dr. Derleth earned his MD at Boston University and did his internal medicine and gastroenterology training at University of Washington.  He joined the UW faculty in 2013 and became program director for the gastroenterology fellowship in 2020.  

Board Certifications:

Internal Medicine, 2009, American Board of Internal Medicine

Gastroenterology, 2013, American Board of Internal Medicine

Education & Training: 
Fellowship in Gastroenterology
University of Washington
Chief Residency in Internal Medicine
UW Medical Center
Residency in Internal Medicine
University of Washington
Medical Education
Boston University School of Medicine
Research & Clinical Interests
Clinical Interests: 
  • Cystic fibrosis (CF)
  • Colorectal cancer screening in CF 
  • Distal intestinal obstruction syndrome (DIOS)
  • Short bowel syndrome
  • Malnutrition in gastrointestinal disease states.

Tartaglione, EV* , Derleth, MD* , Yu, L, Ioannou, GN. Can Computerized Brain Training Games be Used to Identify Early Cognitive Impairment in Cirrhosis? Am J Gastroenterol 2013; 00:000-000; doi:10.1038/ajg.2013.306 (* Joint first authors) [original work]

Derleth MD, Dominitz JA. One-Time Flexible Sigmoidoscopy Reduces Colorectal Cancer Incidence and Mortality. Gastroenterology 2010 Nov;139(5):1784-6. [editorial]