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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. Christopher O'Brien:

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Specialties & Research

Dr. Christopher O'Brien, MD is board certified in Internal Medicine and Infectious Disease.

  • He has special expertise in 3 areas:
  • AIDS/HIV (Acquired Immunodeficiency Syndrome)
  • HIV Infections
  • Hepatitis C

Education & Awards

Dr. O'Brien graduated from Case Western Reserve University , Cleveland.


Dr. O'Brien has 3 hospital affiliations:

  • Kaiser Permanente San Diego Medical Center 
  • UC San Diego Health System 
  • San Diego Medical Center 

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Additional Information
Dr. Christopher Mark O'Brien MD is a male Internist, has 14 years of experience and practices in Internal Medicine and Infectious Disease.
Where does Dr. Christopher M. O'Brien practice?
Dr. Christopher O'Brien has 1 office location.
Dr. Christopher O'Brien practices Internal Medicine and Infectious Disease near San Diego, CA.
See San Diego Internists and San Diego Infectious Disease Doctors.