Mary R. Kwaan, MD, MPH

Mary R. Kwaan, MD, MPH

Colon and Rectal Surgery
Accepting new patients
Primary Location
Westwood Digestive Diseases
100 Medical Plaza
Suite 345
Los Angeles, California 90024


Dr. Mary Kwaan is a Health Sciences Clinical Professor in the David Geffen School of Medicine at UCLA. 

Dr. Kwaan graduated from Harvard University with a degree in Chemistry, obtained her MD from Harvard Medical School, and completed General Surgery training at Brigham and Women’s Hospital in Boston, MA. During residency, she obtained a Master’s in Public Health from the Harvard School of Public Health. She went on to complete a fellowship in Colon and Rectal Surgery at University of Minnesota, where she remained on faculty for another eight years. While there, she was awarded the Owen Wangensteen Award for Excellence in Teaching in 2017 and included in the Best Doctors/Best Doctors for Women List of Minnesota Monthly Magazine for six consecutive years.

Her research interests include postoperative complications such as surgical site infection, urinary complications, and acute kidney injury, hospital readmissions, and disparities in surgical care. She serves on the editorial board of "Disease of the Colon and Rectum" and is reviewer for numerous other surgical journals.




Medical Board Certifications

Colon and Rectal Surgery, American Board of Colon and Rectal Surgery, 2010
Surgery, American Board of Surgery, 2009


Colon & Rectal Surgery, University of Minnesota GME, 2009


General Surgery, Brigham and Women's Hospital, 2008
Anatomical/Clinical Pathology, Brigham and Women's Hospital, 2003


General Surgery, Brigham and Women's Hospital, 2002


MPH, Harvard School of Public Health, 2005
MD, Harvard Medical School, 2001


Hospital Affiliations

Ronald Reagan UCLA Medical Center

UCLA Santa Monica Medical Center

Areas of Focus

Kidney disease
Minimally invasive colorectal surgery


Crohn's disease cases 2022
Ulcerative colitis cases 2022
Inflammatory bowel diseases: Management of Crohn’s disease 2019
Inflammatory bowel diseases: Ulcerative colitis 2019


  • Top Doctors, Los Angeles Magazine, 2021, 2022, 2023
  • Super Doctors® Southern California, 2023