Browse Health
Emergency Physician, Internist
34 years of experience
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. Mary O'Brien:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (4)

The overall average patient rating of Dr. Mary O'Brien is Average. Dr. O'Brien has been reviewed by 8 patients who have provided 4 comments. The rating is 3 out of 5 stars.

Patient Ratings
Ease of Appointment 3.7
Promptness 3.0
Courteous Staff 3.2
Accurate Diagnosis 3.2
Bedside Manner 3.9
Spends Time with Me 3.7
Follows Up After Visit 3.2

Specialties & Research

Dr. Mary O'Brien, MD is board certified in Internal Medicine.

Education & Awards

Dr. O'Brien graduated from Harvard University , Boston.


Dr. O'Brien has 3 hospital affiliations:

  • St Luke's Roosevelt Hospital 
  • Beth Israel Medical Center - Kings Highway Division 
  • Slrhc 


  • English

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Additional Information
Dr. Mary Elizabeth O'Brien MD is a female Emergency Medicine Specialist, has 34 years of experience and practices in Internal Medicine and Emergency Medicine.
Where does Dr. Mary E. O'Brien practice?
Dr. Mary O'Brien has 2 office locations.
Dr. Mary O'Brien practices Internal Medicine and Emergency Medicine near New York, NY.
See New York Internists and New York Emergency Physicians.