William Oh, MD

New Patients

William Oh, MD

Colon/Rectal Surgery


  • Hoag Specialty Clinic


  • English,
  • Korean

About Dr. Oh

William Oh, M.D., F.A.C.S., F.A.S.C.R.S. is double board certified in general surgery as well as colon and rectal surgery. He attended Cornell University’s College of Human Ecology, receiving his bachelor’s degree in human biology, health and society with a concentration in gerontology. He developed an interest in geriatric medicine and went to New York Medical College to obtain his medical degree. During his surgery rotation, Dr. Oh’s plans shifted to becoming a surgeon after observing the on-call surgical team perform an operation on a young patient experiencing acute appendicitis. Once he saw the patient walk out of the hospital, he felt the joy that comes from directly helping a patient utilizing surgery. Dr. Oh completed his general surgery residency at UCSF-Fresno in Fresno, CA, where he developed a special interest in the disease of the colon and rectum. During his time at UCSF-Fresno, he was honored with multiple awards including UCSF Fresno Steven N. Parks Golden Scalpel Award for Outstanding Senior Resident and UCSF Fresno Resident Excellence in Teaching Award.

Following his residency, he pursued a colon and rectal surgery fellowship at Indiana University in Indianapolis, IN, with extensive emphasis on minimally invasive surgical techniques using laparoscopy and the da Vinci® Xi robot. His expertise with the da Vinci® Xi robot has helped patients with colon cancer, rectal cancer, inflammatory bowel disease and rectal prolapse. He is also passionate about managing benign anorectal diseases such as hemorrhoids, anal fissure and anal fistula.

Dr. Oh is a member of the American Society of Colon and Rectal Surgery, American College of Surgeons and American Medical Association. He has authored publications and delivered numerous presentations focused on a variety of topics including management of hemorrhoids and anal fissures, laparoscopic colectomies, benign anorectal diseases and enhanced recovery after surgery protocol to name a few.


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National Provider ID (NPI): 1598100323


  • Medical Education - New York Medical College (Medicine)
  • Residency - UCSF-Fresno (General Surgery)
  • Fellowship - Indiana University (Colon and Rectal Surgery)

Board Certification

  • American Board of Colon and Rectal Surgery - Colon and Rectal Surgery
  • American Board of Surgery - General Surgery


  • Hoag Specialty Clinic

Area of Focus

  • Colon/Rectal Surgery