Browse Health
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).

Patient Reviews

Have you visited Dr. O'Brien? Share your experience.
Write a Review

Specialties & Research

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

  • He has special expertise in 2 areas:
  • Diabetes
  • Diabetes Complications

Education & Awards

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


Dr. O'Brien has 13 hospital affiliations:

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


  • Spanish

Similar doctors nearby

Dr. Nabil Sultani

Internal Medicine
30 years experience
Livonia, MI

Dr. Mowafak Asbahi

43 years experience
Livonia, MI

Dr. Zaheer Ahmad

Internal Medicine
Livonia, MI

Dr. Shanti Eswaran

Internal Medicine
9 years experience
Livonia, MI

Dr. Joseph Davanzo

Internal Medicine
34 years experience
Livonia, MI

Dr. Eliezer Monge

48 years experience
Farmington, MI
Search All Similar Doctors
Additional Information
Dr. John Joseph O'Brien MD is a male Internist, has 30 years of experience and practices in Gastroenterology.
Where does Dr. John J. O'Brien practice?
Dr. John O'Brien has 4 office locations.
Dr. John O'Brien practices Gastroenterology near Livonia, MI.
Additional practice locations include: Omaha, NE and O Fallon, MO.
See Livonia Gastroenterologists.