JOHN MUIR PHYSICIAN NETWORK
NPI 1841407665
General Practice in Walnut Creek, CA
About John Muir Physician Network NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN MUIR PHYSICIAN NETWORK (NPI 1841407665) is a healthcare organization registered as a general practice in Walnut Creek, California and active in the NPI registry since May 2007. The organization holds an CLIA Accreditation certificate valid through September 10, 2027 and lists Mike Thomas, President And Ceo, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
John Muir Physician Network is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
647Medicare enrollment records show 647 clinicians reassign Medicare billing to John Muir Physician Network, which bills Medicare for the services they deliver. Of these, 74 practice at this address and 434 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 37
Nearest to this location (20)
See all 647Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Accreditation 05D2115346
John Muir Physician Network · Walnut Creek, CAFrequently 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 Muir Physician Network's NPI number?
The NPI number for John Muir Physician Network is 1841407665. It was assigned to this organization in the NPPES registry on May 17, 2007.
Where is John Muir Physician Network located?
John Muir Physician Network is located at 1450 Treat Blvd Suite 300, Walnut Creek, CA 94597. The listed phone number is (925) 296-9872.
What is John Muir Physician Network's specialty?
The primary specialty registered for this NPI is General Practice with taxonomy code 208D00000X.
Is John Muir Physician Network enrolled in Medicare?
Yes. John Muir Physician Network is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through John Muir Physician Network?
According to the CMS Revalidation Reassignment List (October 2026 release), 647 clinicians in 37 Medicare specialties reassign their Medicare billing to John Muir Physician Network. A 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 the clinician's services. The largest specialties are Family Practice (163), Internal Medicine (131) and Nurse Practitioner (86). Of these, 74 practice at this address and 434 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does John Muir Physician Network hold a CLIA laboratory certificate?
Yes. A Certificate of Accreditation (number 05D2115346) is associated with this NPI, valid through September 10, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for John Muir Physician Network was last updated on August 28, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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 Muir Physician Network · NPI 1841407665
General Practice organization in Walnut Creek, California. Organization record, active in the CMS NPPES registry since May 17, 2007.
## Identity
- **NPI:** 1841407665 (Entity type: Organization)
- **Enumerated:** May 17, 2007
- **Primary specialty:** General Practice · taxonomy 208D00000X
- **Organization subpart:** No
- **Authorized official:** Mike Thomas, PRESIDENT AND CEO
## Practice location
- **Address:** 1450 TREAT BLVD, SUITE 300, Walnut Creek, CA 94597-2168
- **Phone:** (925) 296-9872 · **Fax:** (925) 952-2845
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 647 clinicians in 37 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Family Practice (163), Internal Medicine (131), Nurse Practitioner (86); 74 practice at this address and 434 within 10 miles; [full list](https://npiprofile.com/npi/1841407665/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 28, 2026
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1841407665) · Data from the CMS NPPES public registry.