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Allergy & Immunology Specialist, Pediatrician
45 years of experience
Accepting new patients
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).

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Education & Awards

Dr. O'Brien graduated from University College Dublin.


Dr. O'Brien has 2 hospital affiliations:

  • Tobey Hospital Site of Southcoast Hospitals Group 
  • Southcoast Hospitals Group,Inc 


  • Italian
  • Russian
  • Spanish

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

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Additional Information
Dr. Catherine Lloyd O'Brien MD is a female Allergist & Immunologist, has 45 years of experience and practices in Allergy & Immunology and Pediatrics.
Where does Dr. Catherine L. O'Brien practice?
Dr. Catherine O'Brien has 4 office locations.
Dr. Catherine O'Brien practices Allergy & Immunology and Pediatrics near Wareham, MA.
Additional practice locations include: Norwell, MA and Kingston, MA.
See Wareham Allergists and Wareham Pediatricians.