JOHN W. WALSH MD
NPI 1164500260
Pathology - Anatomic Pathology in Walnut Creek, CA
About John W. Walsh Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN W. WALSH MD (NPI 1164500260) is an individual anatomic pathology provider in Walnut Creek, California, licensed in California (G11029) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
John W. Walsh Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show John Walsh reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Richmond, CA 94801
- Reassigned Medicare billing, California enrollment
- 20,078 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
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94596 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
WALNUT CREEK, CA 94596
WALNUT CREEK, CA 94596
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 Walsh's NPI number?
The NPI number for John Walsh is 1164500260. It was assigned to this individual provider in the NPPES registry on November 2, 2006.
Where is John Walsh located?
John Walsh practices at 1425 S Main St, Walnut Creek, CA 94596. The listed phone number is (925) 295-4000.
What is John Walsh's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology, with taxonomy code 207ZP0101X.
Is John Walsh enrolled in Medicare?
Yes. John Walsh is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for John Walsh's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Walsh reassigns Medicare benefits to Permanente Medical Group Inc (Richmond, CA). 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 Walsh's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for John Walsh was last updated on December 22, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# John W. Walsh, MD · NPI 1164500260
Anatomic Pathology physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since November 2, 2006.
## Identity
- **NPI:** 1164500260 (Entity type: Individual)
- **Enumerated:** November 2, 2006
- **Primary specialty:** Pathology - Anatomic Pathology · taxonomy 207ZP0101X
- **State license:** G11029 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1425 S MAIN ST, Walnut Creek, CA 94596-5318
- **Phone:** (925) 295-4000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Permanente Medical Group Inc (NPI 1235226531, Richmond, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** December 22, 2021
- **Other identifiers:** Medicaid 00G110290 (CA)
---
Source: [NPI Profile](https://npiprofile.com/npi/1164500260) · Data from the CMS NPPES public registry.