William James O'Brien, PA
Physician Assistant · Livingston, NJ
William James O'Brien, PA is a physician assistant with a practice address in Livingston, New Jersey, and NPI 1649993841, issued on Sep 22, 2022. Check the license (New Jersey 25MP00740600, as entered in NPPES) with the New Jersey board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William James O'Brien
- Credential
- PA
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 25MP00740600 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 94 Old Short Hills RD, Livingston, NJ 07039
- Phone
- (973) 322-5000
- Enumerated
- Sep 22, 2022
- Record last updated
- Jun 27, 2024
- Medicare enrollment
- Enrolled (PECOS I20221121003206); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,393 in New Jersey → Look up another NPI →
Also registered at 94 Old Short Hills RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shirin AbbasiStudent in an Organized Health Care Education/Training Program1770416463
- Ayah AbdallahCertified Registered Nurse Anesthetist1700477379
- Ali AbdullahPeer Specialist1194560680
- Jan AcampadoGerontology Nurse Practitioner1487427001
- Lubab Al-Quraishi, MDStudent in an Organized Health Care Education/Training Program1568084572
- Laura Alban, PA-CPhysician Assistant1609482272
Verify William James O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New Jersey board licenses this profession
Search for license 25MP00740600Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average physician assistant in 2024
101 Medicare Part D claims for 82 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Most prescribed
- Naproxen15 claims
- Cyclobenzaprine Hcl11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $45.55
3 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 64,719 providers of this specialty with any payment received $841.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Rwjbh Emergency Medicine Associates, LLCElizabeth, NJ
- Rwjbh Observation Associates LLCSomerville, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William James O'Brien among 3,393 physician assistant records in New Jersey
William James O'Brien, PA is one of 3,393 physician assistant records with a practice address in New Jersey. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 66% of them.
- NPI issued2022 · 66% of these records are older, 28% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2022 · median 2019 among the 2,168 with a school on file
- Record last updated2024 · 35% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
77 physician assistant records list a practice address in Livingston
They are 77 of the 1,714 NPPES records with a practice address in Livingston, and 3,393 physician assistant records in New Jersey.
All 3,393 in New Jersey → Every provider in Livingston → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Russell Barnhardt, PALivingston, NJ 070391710917141
- Rozalia Belfer, PALivingston, NJ 070391568457349
- Kerri Donnelly, PALivingston, NJ 070391649299983
- Michael Fama, PAMorristown, NJ 070391114953163
- Vincent Gloria, PALivingston, NJ 070391265476477
- Patricia Hoelzler, PALivingston, NJ 070391104928811
- Neal Mageean, PALivingston, NJ 070391477597144
- Scott Palfreyman, PALivingston, NJ 070391407876782
Common questions
What is William James O'Brien, PA's NPI number?
William James O'Brien, PA's National Provider Identifier (NPI) is 1649993841, issued on Sep 22, 2022. An NPI identifies a provider in billing; it is not a license.
Where is William James O'Brien, PA located?
The NPPES record lists a practice address at 94 Old Short Hills RD, Livingston, NJ, 07039. Phone: (973) 322-5000. Providers update this record themselves, so call before visiting.
How can I verify William James O'Brien, PA's license?
NPPES lists New Jersey license number 25MP00740600, as entered by the provider. Search the New Jersey board that licenses this profession; the NPPES record confirms identity only.
How much does William James O'Brien, PA prescribe under Medicare Part D?
In 2024, William James O'Brien, PA had 101 Medicare Part D claims for 82 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.