Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

John Muir Physician Network

General Practice Physician in Walnut Creek, CA · enumerated 2007 · authorized official Mike Thomas, President and Ceo.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1841407665

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Registry record

Entity type Organization (Type 2)

Legal business name John Muir Physician Network

Practice address 1450 Treat Blvd, Suite 300, Walnut Creek, CA, 94597

Phone (925) 296-9872

Fax (925) 952-2845

Enumeration date May 17, 2007

Last updated in NPPES Mar 20, 2025

Taxonomy & classification

208D00000X General Practice Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Mike Thomas

Title President and Ceo

Phone (925) 941-2100

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2025-03-20. Verify at npiregistry.cms.hhs.gov.

Where is John Muir Physician Network located?

The practice location on file with NPPES is in Walnut Creek, CA.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-20.