Marquetta Williamson, ARNP

Primary specialty

Psychiatric/Mental Health Nurse PractitionerTaxonomy code 363LP0808X

License

AP61643314 Issued in WA

Practice address

325 9TH Ave
Seattle, WA 98104-2420

Phone

(206) 520-5000

NPI assigned

Jan 9, 2019

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in NE, WA2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 2

Specialty

Nurse Practitioner

Education

Other, 2019

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

The Association of University PhysiciansGroup PAC ID 0446162697, 3,484 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Harborview Medical Center Hospital, Seattle, WA, CCN 500064

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mwilliamson1764707@direct.ehre.uwmedicine.org

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.

• The Association of University Physicians

  dba University of Washington Physicians

  • Anesthesiology Physician
  • Seattle, WA
  • NPI 1023041159

  Psychiatry

  Medicare reassignment Care Compare group NPD
• Renewed Vision Counseling and Developmental Disability Center PC

  • Mental Health Counselor
  • Omaha, NE
  • NPI 1174122170
  Medicare reassignment NPD
• Williamson Psychiatric Services PC

  • Psychiatric/Mental Health Nurse Practitioner
  • Omaha, NE
  • NPI 1134936578
  NPD Authorized official

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

• Harborview Medical Center

  • General Acute Care Hospital
  • Seattle, WA
  • NPI 1053359729
  Care Compare affiliation

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

{
    "created_epoch": "1546992000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1753747200000",
    "number": "1487127742",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 50095",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981455095",
            "telephone_number": "206-520-5700"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "325 9TH AVE",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981042420",
            "telephone_number": "206-520-5000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WILLIAMSON",
        "first_name": "MARQUETTA",
        "credential": "ARNP",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2019-01-09",
        "last_updated": "2025-07-29",
        "certification_date": "2025-07-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LP0808X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Psychiatric/Mental Health",
            "state": "NE",
            "license": "112714",
            "primary": false
        },
        {
            "code": "363LP0808X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Psychiatric/Mental Health",
            "state": "WA",
            "license": "AP61643314",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Betty Jean Williamson, LMP
• Beverly Ann Williamson, LMHC
• Brent Williamson, LMT
• Estella Corinne Williamson, LMSW
• Kelvin Wayne Williamson, M.D.
• Ruth Williamson
• Olivia Willingham, OTR
• Pamela Willingham, DPT, CLT
• Benjamin Willis
• Elise Christine Picha Willis, MD

• Psychiatric/Mental Health Nurse Practitioner in Seattle, WA
• Providers in Seattle, WA by specialty
• Psychiatric/Mental Health Nurse Practitioner in Washington

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 29, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.