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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. Colin O'Brien:

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Specialties & Research

Dr. Colin O'Brien, ARNP, MD is board certified in Emergency Medicine.

Education & Awards

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


Dr. O'Brien has 4 hospital affiliations:

  • U Mass Memorial Med Ctr - Memorial Campus 
  • Southern Nh Medical Center 

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Additional Information
Dr. Colin H O'Brien ARNP and MD is a male Emergency Medicine Specialist, has 24 years of experience and practices in Emergency Medicine.
Where does Dr. Colin H. O'Brien practice?
Dr. Colin O'Brien has 2 office locations.
Dr. Colin O'Brien practices Emergency Medicine near Worcester, MA.
Additional practice locations include: Nashua, NH.
See Worcester Emergency Physicians.