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Internist, Critical Care Specialist, Pulmonologist (lungs)
28 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).

Patient Reviews

Patient comments (1)

The overall average patient rating of Dr. Gerald O'Brien is Excellent. Dr. O'Brien has been reviewed by 1 patients who have provided 1 comments. The rating is 5 out of 5 stars.

Patient Ratings
Courteous Staff 1.0
Accurate Diagnosis 3.7
Bedside Manner 3.7
Spends Time with Me 3.7
Follows Up After Visit 3.7

Specialties & Research

Dr. Gerald O'Brien, MD is board certified in Internal Medicine, Critical Care Medicine, and Pulmonary Disease.

  • He has special expertise in 6 areas:
  • AIDS/HIV (Acquired Immunodeficiency Syndrome)
  • Asthma
  • Congenital Heart Defects
  • Connective Tissue Diseases
  • Lung Diseases
  • Pulmonary Hypertension

Education & Awards

Dr. O'Brien graduated from Ponce School of Medicine .


Dr. O'Brien has 6 hospital affiliations:

  • Christiana Care Health Services 
  • St Francis Hospital 

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

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Additional Information
Dr. Gerald Martin O'Brien MD is a male Internist, has 28 years of experience and practices in Internal Medicine, Critical Care Medicine, and Pulmonary Disease.
Where does Dr. Gerald M. O'Brien practice?
Dr. Gerald O'Brien has 12 office locations.
Dr. Gerald O'Brien practices Internal Medicine, Critical Care Medicine, and Pulmonary Disease near Newark, DE.
Additional practice locations include: Wilmington, DE and New Castle, DE.
See Newark Internists, Newark Critical Care Practitioners, and Newark Pulmonologists.