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:
View the full profile to get information on:
- What's important to you
View full profile
be the first!
Specialties & Research
Dr. John O'Brien, MD is board certified in Internal Medicine.
More Specialties & Research
Education & Awards
Dr. O'Brien graduated from Rosalind Franklin University, North Chicago.More Education & Awards
Dr. O'Brien has 2 hospital affiliations:
- Advocate Illinois Masonic Medical Center
- John H. Stroger,Jr.,Hospital of Cook County
Accepted Insurance Plans
Dr. O'Brien accepts these health insurances in at least one office:
- Aetna - 3 plans
More Accepted Insurance