DR. JOHN S WALKER D.O.
NPI 1013974500
Anesthesiology in Somerset, NJ
About Dr. John S Walker D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN S WALKER D.O. (NPI 1013974500) is an individual anesthesiology provider in Somerset, New Jersey, licensed in New Jersey (MB56549) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with University Medical Center Of Princeton At Plainsboro, and is a graduate of New York College Of Osteo Medicine Of New York Institute Of Technology (1990).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. John S Walker D.o. 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.
Medicare Billing Reassignment
Medicare enrollment records show John Walker reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Livingston, NJ 07039
- Reassigned Medicare billing, New Jersey enrollment
- 1,913 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Medical Center Of Princeton At Plainsboro
Acute Care Hospitals · Plainsboro, NJRobert Wood Johnson University Hospital At Rahway
Acute Care Hospitals · Rahway, NJRobert Wood Johnson University Hospital - Somerset
Acute Care Hospitals · Somerville, NJOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SOMERSET, NJ 08873
SOMERSET, NJ 08873
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 John Walker's NPI number?
The NPI number for John Walker is 1013974500. It was assigned to this individual provider in the NPPES registry on April 27, 2006.
Where is John Walker located?
John Walker practices at 285 Davidson Ave Suite 204, Somerset, NJ 08873. The listed phone number is (732) 271-1400.
What is John Walker's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is John Walker enrolled in Medicare?
Yes. John Walker 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.
Which organization bills Medicare for John Walker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Walker reassigns Medicare benefits to Rwjbh Observation Associates LLC (Livingston, NJ). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Walker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is John Walker affiliated with any hospitals?
According to CMS data, John Walker is affiliated with University Medical Center Of Princeton At Plainsboro, Robert Wood Johnson University Hospital At Rahway and Robert Wood Johnson University Hospital - Somerset.
When was this NPI record last updated?
The NPPES record for John Walker was last updated on February 27, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Dr. John S Walker, D.O. · NPI 1013974500
Anesthesiology physician in Somerset, New Jersey. Individual provider, active in the CMS NPPES registry since April 27, 2006.
## Identity
- **NPI:** 1013974500 (Entity type: Individual)
- **Enumerated:** April 27, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** MB56549 (New Jersey)
- **Sole proprietor:** No
## Practice location
- **Address:** 285 DAVIDSON AVE, SUITE 204, Somerset, NJ 08873-4153
- **Phone:** (732) 271-1400 · **Fax:** (732) 271-3543
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Rwjbh Observation Associates LLC (NPI 1760095806, Livingston, NJ), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York College Of Osteo Medicine Of New York Institute Of Technology, class of 1990
## Record status
- **NPPES last updated:** February 27, 2018
- **Other identifiers:** Other 527782 (NJ); Medicaid 6269907 (NJ)
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Source: [NPI Profile](https://npiprofile.com/npi/1013974500) · Data from the CMS NPPES public registry.