Mary K Len, MD

Mary K Len, MD

Gastroenterology and Hepatology, Inflammatory Bowel Disease Center

On staff since November 1998

Academic Title: Associate Professor

  • Mary K. Len, MD, is attending physician at Seattle Children’s Hospital and clinical associate professor at the University of Washington School of Medicine. She was trained in pediatric gastroenterology at the University of California, Los Angeles School of Medicine and is board certified in pediatric gastroenterology.

    Len has been a member of the outreach pediatric gastroenterology division, attending clinics at Olympia and Federal Way, Wash., and is a member of the North American Society for Pediatric Gastroenterology and Nutrition. Her research interests include celiac sprue and inflammatory bowel disease.

    • Katryce Bremerton, WA 10.11.23

      Would highly recommend Dr. Len. She is a wonderful provider who has given me hope again, after seriously struggling with my infant's medical team. He is 4 months old and I finally feel like a medical professional has listened to us and is helping to move forward again! After trying Mary Bridge Children's, I can say that Seattle Children's has been so much better in every aspect. And very, very happy to not wait 3 months for appointments.

    • Patricia Auburn, WA 01.23.13

      Dr. Mary Len is a wonderful pediatric GI doctor who is everything you could hope for when seeking treatment for your child. She is a very attentive listener and highly effective communicator - both so important in her line of work. At the very first visit she quickly put my son (and me - the parent) at ease and established a direct connection with her patient that made it possible for him to talk frankly with her about his medical issues every time he saw her. She always showed genuine concern and kindness, and delivered gentle, thoughtful care. She exhibited great medical skill in the diagnosis, treatment, monitoring and follow-up care for my son, who first saw her at age 11. Thanks to Dr. Len, my 23-year-old son has been in remission for so many years now and I am very grateful to her!

    • Luwana Olympia, WA. 06.18.12

      Dr. Len is a caring, hard-working doctor. She thinks of every possible solution to your child's problem until she comes up with something that works. She gives options instead of insisting on methods that you aren't comfortable with. She helped our daughter get rid of her ng tube without having to go the g-tube route. We have been so thankful for her and her excellent advise for our daughters GI care.

  • Award Name Award Description Awarded By Award Date
    Phi Beta Kappa 1981
  • Other Publications

    • Dinulos JG, Darmstadt GL, Len MK, Rutledge JC, Murray KF
      Infantile Crohn disease presenting with diarrhea and pyoderma gangrenosum.
      16445411 Pediatric dermatology, 2006 Jan. : 43-8
  • Presentations Title Event Location Date
    Celiac Sprue Lecture Olympia, WA Feb. 2005


Board Certification(s)

Pediatric Gastroenterology

Medical/Professional School

University of Health Sciences Chicago Medical School, North Chicago, IL


UCLA Medical Center, Los Angeles, CA


UCLA Medical Center, Los Angeles, CA