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B. Mark Zhao


Colorectal surgeon
Avid soccer fan and devoted Arsenal Football Club supporter

Dr. B. Mark Zhao is a colorectal surgeon who cares for patients with conditions of the colon, rectum and anus. His expertise encompasses inflammatory bowel diseases, such as Crohn's disease and ulcerative colitis; colon, rectal and anal cancers; diverticulitis (infection or inflammation of small pouches in the intestines); and pelvic floor disorders, including rectal prolapse, fecal incontinence (problems with bowel control) and constipation. He specializes in using minimally invasive surgical techniques to treat many of these conditions. He also performs colonoscopies and endoscopies to screen for or diagnose conditions of the colon and rectum.

Zhao conducts research on colorectal surgical outcomes, with the goal of making these procedures safer and more effective. He has a particular interest in using biomedical informatics (health-related datasets) to improve patient care.

Zhao earned his medical degree from the University of Iowa Carver College of Medicine. He completed a residency in general surgery at the University of California, San Diego, where he also earned a master of advanced study degree in clinical research and completed a fellowship in clinical informatics. He completed a fellowship in colon and rectal surgery at Washington University in St. Louis, training at Barnes-Jewish Hospital.

  • Education

    University of Iowa, MD, 2015

  • Residencies

    UC San Diego, General Surgery, 2022

  • Fellowships

    UC San Diego, Clinical Informatics, 2019

    Washington University in St. Louis, Colon and Rectal Surgery, 2023

As a colorectal surgeon, I am devoted to providing compassion, empathy and unwavering support to all my patients through challenging times.

Where I see patients (1)