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Organization Active NPI

John Muir Health

Doing business as John Muir Health, Walnut Creek Medical Center

  • General Acute Care Hospital
  • Walnut Creek, CA
National Provider Identifier
1740215219
Registry record updated Aug 28, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
General Acute Care HospitalTaxonomy code 282N00000X
License
140000265 Issued in CA
Legal business name
JOHN MUIR HEALTH
Doing business as
John Muir Health, Walnut Creek Medical Center
Practice address
1601 Ygnacio Valley Rd
Walnut Creek, CA 94598-3122
Phone
(925) 939-3000
Fax
(925) 947-3265
NPI assigned
Jul 12, 2006
Last updated
Aug 28, 2026By the provider in NPPES
Organization subpart
No

NPPES NPI Registry

Updated by the provider on Aug 28, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Authorized official

Name
Mike Thomas
Title
President and Ceo
Phone
(925) 941-2100

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
General Acute Care Hospital 282N00000X 140000265 CA Primary

Addresses

Primary practice location

1601 Ygnacio Valley Rd
Walnut Creek, CA 94598-3122

Mailing address

1400 Treat Blvd
Walnut Creek, CA 94597-2142
Phone (925) 939-3000

Other names 1

  • John Muir Health, Walnut Creek Medical Center Doing business as

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
O20071211000228 CA Part A Provider - Hospital 2264338409 Practice locations: Pleasant Hill, CA; Walnut Creek, CA; San Ramon, CA; Brentwood, CA

NPI to CCN mapping 1

The Medicare certification numbers (CCNs) connected to NPI 1740215219. Details of each certification follow.

Hospital certification: CCN 050180

Legal name
JOHN MUIR HEALTH
Doing business as
JOHN MUIR MEDICAL CENTER - WALNUT CREEK CAMPUS
Certification status
Active
Provider type (POS)
Hospital – Short-term
Participating since
Jul 1, 1966
Last certification
Sep 22, 2008
Beds
296
Ownership / control type
Other
Organization structure
CorporationNon-profit
Incorporated
Feb 28, 1958 in CA
Enrollment address
1601 Ygnacio Valley Rd
Walnut Creek, CA 94598-3122
Main/Primary Hospital Location
Hospital subgroups
Acute care, Rehabilitation unit, Other

Facilities connected through Provider of Services related, parent or unit certification numbers.

Other NPIs with the same Medicare PAC ID 2

NPIs whose Medicare enrollments share a PECOS associate control ID (the same enrolled entity).

Care Compare: Hospital

Medicare Care Compare
Listed as
John Muir Medical Center - Walnut Creek CampusCCN 050180 · All quality measures
Overall star rating
2 of 5
Type
Acute Care Hospitals
Ownership
Voluntary non-profit - Other
Medicare certification status
ActiveFrom the Provider of Services file
Emergency services
Yes

National Provider Directory

National Provider Directory

Ownership & related parties

All disclosed owners & managing parties 22

As disclosed on the Medicare enrollment (CMS All Owners files). Individuals include officers, directors and managing employees, who may not hold ownership.

NameRoleSinceShare
Jane Willemsen Individual W-2 Managing EmployeeExecutive VP & President Hospital O Jul 1, 2006
Vivian Wing Individual Corporate OfficerBoard Director Feb 26, 2024
Jack Thompson Individual Corporate Officer Jan 1, 2019
John K Merson Individual Corporate Officer Jan 1, 2018
Claudia Matthews Individual W-2 Managing EmployeeCredentialing Supervisor May 9, 2022
Ted Wang Individual Corporate OfficerChief Financial Officer Jan 6, 2025
John Muir Health Organization, Walnut Creek, CA 5% Or Greater Direct Ownership Interest Nov 26, 2007
Operational/Managerial Control Nov 26, 2007
Kathleen Villanueva Individual W-2 Managing EmployeeCredentialing Coordinator May 9, 2023
Fatima Angeles Individual Corporate OfficerBoard Director Feb 26, 2024
Johannes Peters Individual Corporate Officer Jan 1, 2018
Tracy Porter Individual Corporate OfficerBoard Director Jan 1, 2025
Kathleen Odne Individual Corporate OfficerVice Chair Jan 1, 2015
Peter Wilson Individual Corporate OfficerBoard Director Feb 26, 2024
Mark P Musco Individual Corporate DirectorBoard Member, Cmmittee Member Sep 1, 2013
Roger Bailey Individual Corporate DirectorDirector Jan 1, 2019
Ravinder S. Hundal Individual Corporate DirectorBoard Member Committee Member Sep 1, 2013
Anne Grodin Individual Corporate Officer Jan 1, 2018
Michael Thomas Individual Corporate OfficerChief Executive Officer Oct 1, 2022
John Pancoast Harris Individual Corporate Officer Jan 1, 2018
Chinnavuth de Monteiro Individual Corporate OfficerBoard Director Feb 26, 2024
Laura Gallagher Individual Corporate OfficerBoard Director Feb 26, 2024
John Sayres Individual Corporate OfficerSecretary Jan 1, 2018

Owners & managing parties with NPI records 8

Owners and managing parties disclosed on this facility’s Medicare enrollment that are themselves Medicare-enrolled.

All facility ownership & control disclosures 2

Facilities whose Medicare enrollment lists this provider’s PECOS associate ID as an owner or managing party.

FacilityTypeRoleSince
San Ramon Regional Medical CenterSan Ramon, CA, CCN 050689 Hospital 5% Or Greater Direct Ownership Interest (49%) May 15, 2013
John Muir Behavioral Health CenterConcord, CA, CCN 054131 Hospital 5% Or Greater Direct Ownership Interest Jun 4, 1991

Owned or controlled facilities with NPI records 2

Facilities whose Medicare enrollment lists this provider as an owner, officer, director or managing party.

Facilities with the same owner 2

Facilities that share an organizational owner with 5% or greater ownership or operational control.

Practitioners & affiliated clinicians

Affiliated clinicians 1,173

Clinicians who list this facility as an affiliation in Medicare Care Compare.

View all 1,173

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1152662400000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1787875200000",
    "number": "1740215219",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1400 TREAT BLVD",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945972142",
            "telephone_number": "925-939-3000",
            "fax_number": "925-308-8944"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1601 YGNACIO VALLEY RD",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945983122",
            "telephone_number": "925-939-3000",
            "fax_number": "925-947-3265"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "JOHN MUIR HEALTH",
        "organizational_subpart": "NO",
        "enumeration_date": "2006-07-12",
        "last_updated": "2026-08-28",
        "certification_date": "2026-08-28",
        "status": "A",
        "authorized_official_last_name": "THOMAS",
        "authorized_official_first_name": "MIKE",
        "authorized_official_title_or_position": "PRESIDENT AND CEO",
        "authorized_official_telephone_number": "925-941-2100"
    },
    "taxonomies": [
        {
            "code": "282N00000X",
            "taxonomy_group": "",
            "desc": "General Acute Care Hospital",
            "state": "CA",
            "license": "140000265",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "organization_name": "John Muir Health, Walnut Creek Medical Center",
            "code": "3",
            "type": "Doing Business As"
        }
    ]
}

Other providers in Walnut Creek, CA

Sources for this page

Verify at the official NPI Registry.