William S Menzin, LICSW

Primary specialty

Clinical Social WorkerTaxonomy code 1041C0700X

License

LC0300427 Issued in DC

Practice address

3000 Connecticut Ave NW Apt 302
Washington, DC 20008-2531

Phone

(202) 270-0550

Fax

(703) 757-2270

NPI assigned

Feb 12, 2007

Last updated

May 18, 2026By 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

Enrolled in DC

Eligible to order & refer

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

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

State licenses

Practice roles

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.

• Mary K. O'Farrell, PH.D., P.a.

  • Psychologist
  • Washington, DC
  • NPI 1164699088
  NPD (past)

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

{
    "created_epoch": "1171238400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1779062400000",
    "number": "1982746632",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "802 AARON CT",
            "city": "GREAT FALLS",
            "state": "VA",
            "postal_code": "220662514",
            "telephone_number": "202-270-0550",
            "fax_number": "703-757-2270"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3000 CONNECTICUT AVE NW APT 302",
            "city": "WASHINGTON",
            "state": "DC",
            "postal_code": "200082531",
            "telephone_number": "202-270-0550",
            "fax_number": "703-757-2270"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MENZIN",
        "first_name": "WILLIAM",
        "middle_name": "S",
        "name_prefix": "Mr.",
        "credential": "LICSW",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2007-02-12",
        "last_updated": "2026-05-18",
        "certification_date": "2026-05-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "DC",
            "license": "LC0300427",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Mentalmassage LLC
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• Clinical Social Worker in Washington, DC
• Providers in Washington, DC by specialty
• Clinical Social Worker in District of Columbia

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 18, 2026; 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.