NPIMap

Individual provider Active NPI

Isaac Anton Fonken, M.D.

  • Family Medicine Physician
  • Tacoma, WA
National Provider Identifier
1538665542
Registry record updated Sep 4, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Family Medicine PhysicianTaxonomy code 207Q00000X
License
MD.MD.61669853 Issued in WA
Practice address
1112 6TH Ave
3-TFM
Tacoma, WA 98405-4040
Phone
(253) 792-6680
Fax
(253) 403-2915
NPI assigned
Mar 30, 2018
Last updated
Sep 4, 2025By the provider in NPPES
Sex
Male
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Sep 4, 2025

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Family Medicine Physician 207Q00000X 101180 MT
Family Medicine PhysicianGroup: 193200000X MULTI-SPECIALTY GROUP 207Q00000X MD.MD.61669853 WA Primary

Addresses

Primary practice location

1112 6TH Ave
3-TFM
Tacoma, WA 98405-4040

Mailing address

1112 6TH Ave
Tacoma, WA 98405-4040
Phone (253) 792-6680

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MT, WA2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20210901003846 MT Practitioner - Family Practice 7810251113 Reassigns benefits to 1 organization
I20250730003885 WA Practitioner - Family Practice 7810251113 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Family Practice
Education
University of Colorado School of Medicine, Aurora, 2018
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Multicare Health SystemGroup PAC ID 7719899897, 2,312 clinicians

Practice addresses (Care Compare)

311 S L St
Tacoma, WA 98405-3720

521 Martin Luther King Jr Way
Tacoma, WA 98405-4238
Phone (253) 403-2900

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
101180MTMDFamily Medicine Physician
MD.MD.61669853WAMDFamily Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Multicare Health System Multi-Specialty CurrentSince Jul 2, 2025 Accepting new patients
Multicare Health System CurrentSince Jul 2, 2025 Accepting new patients
Multicare Health System Multi-Specialty Current Accepting new patients
Yellowstone City-County Health Department CurrentSince Sep 27, 2021 Accepting new patients
Yellowstone City-County Health Dept Multi-Specialty CurrentSince Sep 27, 2021 Accepting new patients
Multicare Health System Multi-Specialty PastSince Sep 8, 2025 Accepting new patients
Billings Rehabilitation and Nursing LLC Past Accepting new patients
SCL Health Montana Multi-Specialty Past Accepting new patients
Billings Clinic Past Accepting new patients
Multicare Health System Past Accepting new patients
Multicare Health System Past Accepting new patients

Locations

123 S 27th St
Billings, MT 59101
Phone (406) 247-3200

4700 Point Fosdick Dr
Ste 104
Gig Harbor, WA 98335
Phone (253) 459-7590

222 State Ave N
Kent, WA 98030
Phone (253) 372-7680

311 S L St
Tacoma, WA 98405
Phone (253) 403-1444

521 S K St
Tacoma, WA 98405
Phone (253) 403-2900

Organizations & group practices 11

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

Hospital & facility affiliations 1

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

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

{
    "created_epoch": "1522368000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756944000000",
    "number": "1538665542",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1112 6TH AVE",
            "city": "TACOMA",
            "state": "WA",
            "postal_code": "984054040",
            "telephone_number": "253-792-6680",
            "fax_number": "253-403-2915"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1112 6TH AVE",
            "address_2": "3-TFM",
            "city": "TACOMA",
            "state": "WA",
            "postal_code": "984054040",
            "telephone_number": "253-792-6680",
            "fax_number": "253-403-2915"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FONKEN",
        "first_name": "ISAAC",
        "middle_name": "ANTON",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2018-03-30",
        "last_updated": "2025-09-04",
        "certification_date": "2025-09-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "MT",
            "license": "101180",
            "primary": false
        },
        {
            "code": "207Q00000X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Family Medicine",
            "state": "WA",
            "license": "MD.MD.61669853",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Tacoma, WA

Sources for this page

Verify at the official NPI Registry.