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WILLIAM JAMES O'BRIEN PA
NPI 1649993841
Physician Assistant in Livingston, NJ

Active since September 22, 2022PECOS EnrolledAccepts Medicare Assignment
94 OLD SHORT HILLS RD, LIVINGSTON, NJ 07039(973) 322-5000 Get Directions Write a Review

NPPES record last updated: June 27, 2024. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jun 27, 2024, Sep 22, 2022 (2 updates tracked since 2022).

About William James O'brien Pa NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM JAMES O'BRIEN PA (NPI 1649993841) is an individual physician assistant in Livingston, New Jersey, licensed in New Jersey (25MP00740600) and active in the NPI registry since September 2022. He is enrolled in Medicare PECOS, is affiliated with Cooperman Barnabas Medical Center, and is a graduate of Other (2022).

NPPES Registry Identity

NPI1649993841
Entity TypeIndividualMale
Primary Taxonomy363A00000X
Provider Legal NameWILLIAM JAMES O'BRIENCredential: PA
Location Address94 OLD SHORT HILLS RDLivingston, NJ 07039-5672
Mailing Address102 E Bay View DrAnnapolis, MD 21403-4102 · (240) 778-8873
Phone(973) 322-5000
Sole ProprietorNo
Medical School CMSOtherGraduated 2022
Enumeration DateSeptember 22, 2022
Last NPPES UpdateJune 27, 20242 updates tracked since enumeration
NPPES CertifiedJune 27, 2024
✔ NPI 1649993841 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License✔ Licensed in NJ · 25MP00740600
Definition
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
94 OLD SHORT HILLS RD, Livingston, NJ 07039
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William James O'brien Pa is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4082082185
PECOS Enrollment IDI20221121003206
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
13 services13 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
12 services12 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Cooperman Barnabas Medical Center

Acute Care Hospitals · Livingston, NJ
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number310076
Location94 Old Short Hills RoadLivingston, NJ 07039 · Essex County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 07039 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$98.09 typical visit price
range $63.84 – $190.92
Typical copayment $24.52 (range $15.96 – $47.73)
Most-billed visit code 99203
Established Patient
$79.09 typical visit price
range $20.97 – $155.92
Typical copayment $19.77 (range $5.24 – $38.98)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JACOB JOSEPH FERGUSON MD
Anesthesiology
94 OLD SHORT HILLS RD
LIVINGSTON, NJ 07039
Essex County (973) 322-5000
CASSIDY MARTIN DNP
Nurse Practitioner (Gerontology)
94 OLD SHORT HILLS RD
LIVINGSTON, NJ 07039
Essex County (973) 322-2793
HARRY S VANWAGENEN PA-C
Psychiatry & Neurology (Neurology)
94 OLD SHORT HILLS RD
LIVINGSTON, NJ 07039
Essex County (973) 322-5000
ASSOCIATES IN TRANSPLANT AND GENERAL SURGERY
Specialist
94 OLD SHORT HILLS RD, EAST WING, SUITE 305
LIVINGSTON, NJ 07039
Essex County (973) 322-9801
TERESITA C REDONDO MD
Pathology (Anatomic Pathology & Clinical Pathology)
94 OLD SHORT HILLS RD
LIVINGSTON, NJ 07039
Essex County (973) 322-5763
DR. GREGORY JOSEPH ROKOSZ D.O.
Emergency Medicine
94 OLD SHORT HILLS RD
LIVINGSTON, NJ 07039
Essex County (973) 322-5733
BILAL KHAN
Internal Medicine (Critical Care Medicine)
94 OLD SHORT HILLS RD
LIVINGSTON, NJ 07039
Essex County (646) 591-5953
MRS. KATHERINE DANIELLE SZUCS APN
Nurse Practitioner
94 OLD SHORT HILLS RD
LIVINGSTON, NJ 07039
Essex County (973) 322-2249

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William O'brien's NPI number?

The NPI number for William O'brien is 1649993841. It was assigned to this individual provider in the NPPES registry on September 22, 2022.

Where is William O'brien located?

William O'brien practices at 94 Old Short Hills Rd, Livingston, NJ 07039. The listed phone number is (973) 322-5000.

What is William O'brien's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is William O'brien enrolled in Medicare?

Yes. William O'brien is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does William O'brien accept?

Health plans from Ambetter Health and Ambetter Health of Delaware list William O'brien as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is William O'brien affiliated with any hospitals?

According to CMS data, William O'brien is affiliated with Cooperman Barnabas Medical Center.

When was this NPI record last updated?

The NPPES record for William O'brien was last updated on June 27, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.