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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. Tommy Oei:

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Specialties & Research

Dr. Tommy Oei, MD is board certified in Gastroenterology.

  • He has special expertise in 5 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Constipation
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Oei graduated from New York University.


Dr. Oei has 2 hospital affiliations:

  • Kaiser Permanente Fontana Medical Center 
  • Fontana Medical Center 

> > > > Dr. Tommy Oei, MD

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Additional Information
Dr. Tommy Tiong-Hien Oei MD is a male Internist, has 15 years of experience and practices in Internal Medicine and Gastroenterology.
Where does Dr. Tommy T. Oei practice?
Dr. Tommy Oei has 1 office location.
Dr. Tommy Oei practices Internal Medicine and Gastroenterology near Fontana, CA.
See Fontana Internists and Fontana Gastroenterologists.