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Internist, Cardiologist (heart)
35 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).

Patient Reviews

Patient comments (1)

The overall average patient rating of Dr. John O'Brien is Good. Dr. O'Brien has been reviewed by 4 patients who have provided 1 comments. The rating is 4 out of 5 stars.

Patient Ratings
Ease of Appointment 3.7
Promptness 4.3
Courteous Staff 4.3
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 4.3
Follows Up After Visit 5.0

Specialties & Research

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

  • He has special expertise in 7 areas:
  • Acute Coronary Syndrome (ACS)
  • Heart Block
  • Heart Failure
  • High Blood Pressure (Hypertension)
  • High Cholesterol (Hypercholesterolemia)
  • Myocardial Infarction
  • Unstable Angina

Education & Awards

Dr. O'Brien graduated from Georgetown University, Washington.


Dr. O'Brien has 2 hospital affiliations:

  • Inova Fair Oaks Hospital 
  • Inova Fairfax Hospital 


  • English

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

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Additional Information
Dr. John T O'Brien MD is a male Internist, has 35 years of experience and practices in Internal Medicine, Cardiovascular Disease, Cardiology, and Interventional Cardiology.
Where does Dr. John T. O'Brien practice?
Dr. John O'Brien has 2 office locations.
Dr. John O'Brien practices Internal Medicine, Cardiovascular Disease, Cardiology, and Interventional Cardiology near Annandale, VA.
Additional practice locations include: Fairfax, VA.
See Annandale Internists and Annandale Cardiologists.