Mark D. Derleth M.D.

Mark D. Derleth M.D.

Specialties and Expertise



Digestive Health




Digestive Health Center at UWMC

1959 NE Pacific St.
Seattle, WA 98195
Phone: 206.598.4377|Map It 

Gastroenterology Clinic at Eastside Specialty Center

3100 Northup Way
Bellevue, WA 98004
Phone: 425.646.7777|Map It 


Dr. Derleth is a board-certified physician in Gastroenterology and Internal Medicine. He sees patients in clinic and performs procedures at both the UW Eastside Specialties Center in Bellevue (his primary site) and the UW Medical Center in Seattle. A native of the Pacific Northwest, he grew up in Edmonds, WA, and then Wenatchee, WA. He did his undergraduate education at University of Washington, completing a Bachelor of Arts in English Literature as well as his pre-medical curriculum. He earned his medical degree at Boston University School of Medicine. He subsequently returned to Seattle where he completed his Residency in Internal Medicine, Chief Residency, and Fellowship in Gastroenterology, all at the UW. He joined the faculty in the UW Division of Gastroenterology in 2013.

Patient Care Philosophy

I believe that good communication is a crucial part of providing good care to patients. I strive to understand my patients’ concerns and expectations so that I can best assist them.

Personal Interests

Music (I am a guitarist and singer, mostly performing for my family these days), being outdoors, hiking, camping, skiing, biking, and swimming.

Clinical Interests

General Gastroenterology, including Gastroesophageal Reflux Disease (GERD) ; Dyspepsia and Abdominal Pain; Diarrhea and Constipation; Colon Cancer Screening; Irritable Bowel Syndrome (IBS) ; GI Bleeding Iron Deficiency Anemia


University of WashingtonFellowshipGastroenterology2013
University of WashingtonResidencyInternal Medicine2010
University of WashingtonInternshipInternal Medicine2007
Boston University School of MedicineMedical educationInpatient Medicine2006


Board Certifications

American Board of Internal MedicineGastroenterology2013
American Board of Internal MedicineInternal Medicine2009
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