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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- Currently 2.5 of 4 stars
The overall average patient rating of Dr. Mary O'Brien is Good.
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Specialties & Research
Dr. Mary O'Brien, MD is board certified in Internal Medicine.
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Education & Awards
Dr. O'Brien graduated from Harvard University , Boston.More Education & Awards
Dr. O'Brien has 2 hospital affiliations:
- St Luke's Roosevelt Hospital