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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 (2)

The overall average patient rating of Dr. James O'Brien is Excellent. Dr. O'Brien has been reviewed by 14 patients who have provided 2 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.8
Promptness 5.0
Courteous Staff 4.8
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 4.7

Specialties & Research

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

Education & Awards

Dr. O'Brien graduated from New York Medical College, Valhalla. He has 3 awards.

Patients' Choice Award (2012 - 2014)
Compassionate Doctor Recognition (2014)
On-Time Doctor Award (2014)


Dr. O'Brien has 4 hospital affiliations:

  • University of California, Irvine Medical Center 
  • Saddleback Memorial Laguna Hills 

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

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Additional Information
Dr. James Dennis O'Brien MD is a male Internist, has 20 years of experience and practices in Internal Medicine.
Where does Dr. James D. O'Brien practice?
Dr. James O'Brien has 2 office locations.
Dr. James O'Brien practices Internal Medicine near Irvine, CA.
Additional practice locations include: Orange, CA.
See Irvine Internists.