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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).

Patient Reviews

Patient comments (3)

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

Patient Ratings
Ease of Appointment 3.9
Promptness 4.2
Courteous Staff 4.1
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 4.3

Specialties & Research

  • She has special expertise in 3 areas:
  • AIDS/HIV (Acquired Immunodeficiency Syndrome)
  • Infectious Disease
  • Rheumatic Diseases

Education & Awards

Dr. O'Brien graduated from Philadelphia College of Osteopathic Medicine.


Dr. O'Brien has 3 hospital affiliations:

  • Lehigh Valley Hospital 
  • Lehigh Valley Hospital - Muhlenberg 
  • Lehigh Valley Hospital - Allentown Campuses 


  • English

> > > > Dr. Marie O'Brien, DO

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Additional Information
Dr. Marie S O'Brien DO is a female Internist, has 10 years of experience and practices in Internal Medicine.
Where does Dr. Marie S. O'Brien practice?
Dr. Marie O'Brien has 4 office locations.
Dr. Marie O'Brien practices Internal Medicine near Allentown, PA.
Additional practice locations include: Hamburg, PA.
See Allentown Internists.