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44 years of experience
Accepting new patients
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 Internal Medicine.

Education & Awards

Dr. O'Brien graduated from University of Louisville .


Dr. O'Brien has 6 hospital affiliations:

  • Flaget Memorial Hospital 
  • Norton Hospital 

> > > > Dr. John O'Brien, MD

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Additional Information
Dr. John Gerard O'Brien MD is a male Internist, has 44 years of experience and practices in Internal Medicine.
Where does Dr. John G. O'Brien practice?
Dr. John O'Brien has 2 office locations.
Dr. John O'Brien practices Internal Medicine near Louisville, KY.
See Louisville Internists.