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Internist, Adolescent Specialist
22 years of experience
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. John O'Brien:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

  • Currently 4 of 4 stars
Patient comments (0)

The overall average patient rating of Dr. John O'Brien is Excellent. Dr. O'Brien has been reviewed by 1 patients who have provided 0 comments. The rating is 4 out of 4 stars.

Specialties & Research

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

Education & Awards

Dr. O'Brien graduated from Rosalind Franklin University, North Chicago.


Dr. O'Brien has 2 hospital affiliations:

  • Advocate Illinois Masonic Medical Center 
  • John H. Stroger,Jr.,Hospital of Cook County 

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Additional Information
Dr. John Martin O'Brien MD is a male Internist, has 22 years of experience and practices in Internal Medicine and Adolescent Medicine.
Where does Dr. John M. O'Brien practice?
Dr. John O'Brien has 3 office locations.
Dr. John O'Brien practices Internal Medicine and Adolescent Medicine near Chicago, IL.
See Chicago Internists and Chicago Adolescent Specialists.