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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).

Learn more about Dr. Mark O'Brien:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. Mark O'Brien is Excellent. Dr. O'Brien has been reviewed by 4 patients who have provided 0 comments. The rating is 5 out of 5 stars.

Specialties & Research

  • He has special expertise in 1 area:
  • Hospitalist

Education & Awards

Dr. O'Brien graduated from Michigan State University , East Lansing. He has 1 awards.

Patients' Choice Award (2008 - 2009)


Dr. O'Brien has 6 hospital affiliations:

  • Palomar Medical Center 
  • Scripps Mercy Hospital San Diego 

> > > > Dr. Mark O'Brien, DO

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Additional Information
Dr. Mark Conway O'Brien DO is a male Internist, has 24 years of experience and practices in Internal Medicine.
Where does Dr. Mark C. O'Brien practice?
Dr. Mark O'Brien has 5 office locations.
Dr. Mark O'Brien practices Internal Medicine near Carlsbad, CA.
Additional practice locations include: Oceanside, CA and San Marcos, CA.
See Carlsbad Internists.