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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).

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Specialties & Research

Dr. John O'Brien, MD is board certified in Gastroenterology.

  • He has special expertise in 7 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Constipation
  • Diabetes
  • Diabetes Complications
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. O'Brien graduated from University of Missouri at Columbia.


Dr. O'Brien has 11 hospital affiliations:

  • Providence Hospital and Medical Center 
  • St. Mary Mercy Hospital 


  • Spanish

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Additional Information
Dr. John Joseph O'Brien MD is a male Internist, has 31 years of experience and practices in Gastroenterology.
Where does Dr. John J. O'Brien practice?
Dr. John O'Brien has 7 office locations.
Dr. John O'Brien practices Gastroenterology near Livonia, MI.
Additional practice locations include: Farmington, MI and Southfield, MI.
See Livonia Gastroenterologists.