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

William James O'Brien, PA

Individual provider Physician Assistant · NPI 1649993841

William James O'Brien, PA is a Physician Assistant in Livingston, New Jersey. Qualified in 2022, 4 years ago. Practices with Rwjbh Observation Associates LLC, a 971-clinician group and accepts Medicare assignment. Licensed in New Jersey.

Years since qualifying
4
Licensed in
NJ
In the registry since
2022
Specialties on file
2
What do these letters mean?
PA — Physician Assistant
A licensed clinician who examines, diagnoses and treats under a physician's supervision.

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Practice location Address checks out

94 Old Short Hills Rd
Livingston, NJ 07039-5672
Phone: (973) 322-5000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X · Licence 25MP00740600 (NJ)
Physician Assistant Taxonomy 363A00000X

Record details

NPI number1649993841
Entity typeIndividual (Type 1)
GenderMale
Credentials PA
Sole proprietorNo
NPI enumeratedSeptember 22, 2022
Last updated in NPPESJune 27, 2024
Certification dateJune 27, 2024

Medicare enrollment

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

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolOTHER
Graduated 2022 (4 years in practice)
Group practice Rwjbh Observation Associates Llc — 971 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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