Mary Dianne Plummer Loudon, PHD

Primary specialty

Mental Health CounselorTaxonomy code 101YM0800X

License

PY60063635 Issued in WA

Practice address

1700 Westlake Ave. N.
Suite 400
Seattle, WA 98109-6263

Phone

(206) 769-2052

NPI assigned

Jun 9, 2010

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Other names 1

• Dr. Mary Dianne Plummer Former name

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Opted out of Medicare

Yes, effective Jul 16, 2025 through Jul 16, 2027

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Philosophy

State licenses

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

{
    "created_epoch": "1276041600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1629763200000",
    "number": "1821318171",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1700 WESTLAKE AVE. N.",
            "address_2": "SUITE 400",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981096263",
            "telephone_number": "206-769-2052"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1700 WESTLAKE AVE. N.",
            "address_2": "SUITE 400",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981096263",
            "telephone_number": "206-769-2052"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "LOUDON",
        "first_name": "MARY",
        "middle_name": "DIANNE PLUMMER",
        "name_prefix": "Dr.",
        "credential": "PHD",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2010-06-09",
        "last_updated": "2021-08-24",
        "certification_date": "2021-08-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "103TC0700X",
            "taxonomy_group": "",
            "desc": "Psychologist, Clinical",
            "state": "WA",
            "license": "PY60063635",
            "primary": false
        },
        {
            "code": "101YM0800X",
            "taxonomy_group": "",
            "desc": "Counselor, Mental Health",
            "state": "WA",
            "license": "PY60063635",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "MARY",
            "last_name": "PLUMMER",
            "middle_name": "DIANNE",
            "prefix": "DR.",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Vivian Lou, MD
• William Lou, MD
• Loud & Clear Speech Therapy, PLLC
• Lillian Louden-Mosio, BA, MSW STUDENT
• Daniel Michael Louderback, MA, LMHC
• Melody Rose Lough, ARNP
• Rachel Lough
• Dawn Marie Loughlin, OTD, OTR/L
• Abby Louie
• Alanna Louie, O.D.

• Mental Health Counselor in Seattle, WA
• Providers in Seattle, WA by specialty
• Mental Health Counselor in Washington

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 24, 2021; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Opt Out Affidavits.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.