Gregory Demitri Williams

Primary specialty

Addiction (Substance Use Disorder) CounselorTaxonomy code 101YA0400X

License

225855 Issued in CA

Practice address

1871 9TH St
Santa Monica, CA 90404-4501

Phone

(310) 314-6200

NPI assigned

May 12, 2025

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

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.

• San Fernando Recovery Center

  • Substance Abuse Rehabilitation Facility
  • San Fernando, CA
  • NPI 1164980603
  NPD (past)
• San Fernando Recovery Center

  • Substance Use Disorder Rehabilitation Clinic/Center
  • San Fernando, CA
  • NPI 1275478745
  NPD (past)

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

{
    "created_epoch": "1747008000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1777248000000",
    "number": "1982495818",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "8830 MOONBEAM AVE",
            "city": "PANORAMA CITY",
            "state": "CA",
            "postal_code": "914022622",
            "telephone_number": "747-500-9405"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1871 9TH ST",
            "city": "SANTA MONICA",
            "state": "CA",
            "postal_code": "904044501",
            "telephone_number": "310-314-6200"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "762 Griswold Ave",
            "address_purpose": "LOCATION",
            "city": "San Fernando",
            "state": "CA",
            "postal_code": "913402105",
            "country_code": "US",
            "telephone_number": "747-500-9405",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "WILLIAMS",
        "first_name": "GREGORY",
        "middle_name": "DEMITRI",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2025-05-12",
        "last_updated": "2026-04-27",
        "certification_date": "2026-04-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YA0400X",
            "taxonomy_group": "",
            "desc": "Counselor, Addiction (Substance Use Disorder)",
            "state": "CA",
            "license": "225855",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• William Parker-Amyrosenman-Ingrid Rodi Partners (PARKER ROSENMAN RODI - Gynecology & Infertility Medical Group)
• Alison Williams, DDS
• Byron Williams
• Erin Marie Williams
• Eugina Williams
• Jana Williams, M. D.
• Joyce Williams
• Justin Williams
• Larry Douglas Williams
• Mark Joshua Williams

• Addiction (Substance Use Disorder) Counselor in Santa Monica, CA
• Providers in Santa Monica, CA by specialty
• Addiction (Substance Use Disorder) Counselor in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 27, 2026; 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.