Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mary Jean O, MD

Individual provider Emergency Medicine Physician · NPI 1912133810

Mary Jean O, MD is an Emergency Medicine in New Brunswick, New Jersey. Qualified in 2009, 17 years ago. Practices with Hartford Healthcare Medical Group Specialists PLLC, a 1,537-clinician group and accepts Medicare assignment. Licensed in Connecticut, New Jersey and New York.

Years since qualifying
17
Licensed in
CT, NJ, NY
In the registry since
2009
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1 Robert Wood Johnson Pl Dept OF Emergency Medicine
New Brunswick, NJ 08901-1928
Phone: (732) 937-8700
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 25MA09247300 (NJ)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 51520 (CT)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 267682 (NY)

Record details

NPI number1912133810
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 5, 2009
Last updated in NPPESOctober 28, 2020
Certification dateOctober 28, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2009 (17 years in practice)
Group practice Hartford Healthcare Medical Group Specialists Pllc — 1537 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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