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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. Margaret O'Brien:

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Specialties & Research

Dr. Margaret O'Brien, MD is board certified in Anesthesiology.

Education & Awards

Dr. O'Brien graduated from New York University - Mount Sinai.


Dr. O'Brien has 11 hospital affiliations:

  • Bryn Mawr Rehabilitation Hospital 
  • Main Line Hospital - Bryn Mawr 


  • French

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Additional Information
Dr. Margaret M O'Brien MD is a female Anesthesiologist, has 22 years of experience and practices in Anesthesiology.
Where does Dr. Margaret M. O'Brien practice?
Dr. Margaret O'Brien has 6 office locations.
Dr. Margaret O'Brien practices Anesthesiology near Lancaster, PA.
Additional practice locations include: Bryn Mawr, PA and Bensalem, PA.
See Lancaster Anesthesiologists.