Stefan Z Wiktor

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

61394323 Issued in WA

Practice address

5506 16TH Ave NE
Seattle, WA 98105-3415

Phone

(206) 661-3597

NPI assigned

Dec 12, 2025

Last updated

Dec 17, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

State licenses

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

{
    "created_epoch": "1765497600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765929600000",
    "number": "1366306482",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5506 16TH AVE NE",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981053415",
            "telephone_number": "206-661-3597"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5506 16TH AVE NE",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981053415",
            "telephone_number": "206-661-3597"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WIKTOR",
        "first_name": "STEFAN",
        "middle_name": "Z",
        "name_prefix": "Dr.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2025-12-12",
        "last_updated": "2025-12-17",
        "certification_date": "2025-12-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "WA",
            "license": "61394323",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Wiicare Washington LLC
• Wiicare Washington, LLC
• Michelle Wiiki
• Sandhira Wijayaratne, MD
• Olindi Wijesekera, MD
• Carolyn Marie Wilbanks, MSW
• Nathan Derek Wilbanks, M.D.
• Ellen Wilber, M.D.
• Robert L Wilburn, MD
• Rand Nicholas Wilcox Vanden Berg, MD

• Internal Medicine Physician in Seattle, WA
• Providers in Seattle, WA by specialty
• Internal Medicine Physician in Washington

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 17, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.