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Internist, Cardiologist (heart)
48 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
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Specialties & Research

  • He has special expertise in 5 areas:
  • Acute Coronary Syndrome (ACS)
  • Heart Block
  • High Blood Pressure (Hypertension)
  • High Cholesterol (Hypercholesterolemia)
  • Unstable Angina

Education & Awards

Dr. O'Brien graduated from Stanford University.


Dr. O'Brien has 7 hospital affiliations:

  • John Muir Medical Center, Walnut Creek Campus 
  • California Pacific Medical Center - Davies Campus 

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

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Additional Information
Dr. John Baldwin O'Brien MD is a male Internist, has 48 years of experience and practices in Internal Medicine and Cardiology.
Where does Dr. John B. O'Brien practice?
Dr. John O'Brien has 2 office locations.
Dr. John O'Brien practices Internal Medicine and Cardiology near San Francisco, CA.
See San Francisco Internists and San Francisco Cardiologists.