Stephen Joseph Irwin, LCSW

Primary specialty

Clinical Social WorkerTaxonomy code 1041C0700X

License

136529 Issued in CA

Practice address

1263 Mission St
San Francisco, CA 94103-2705

Phone

(628) 758-2433

Fax

(415) 514-6466

NPI assigned

May 2, 2023

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Other identifiers 3

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": "1682985600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1769385600000",
    "number": "1093404485",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1263 MISSION ST",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941032705",
            "telephone_number": "628-758-2433",
            "fax_number": "415-514-6466"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1263 MISSION ST",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941032705",
            "telephone_number": "628-758-2433",
            "fax_number": "415-514-6466"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "IRWIN",
        "first_name": "STEPHEN",
        "middle_name": "JOSEPH",
        "name_prefix": "Mr.",
        "credential": "LCSW",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2023-05-02",
        "last_updated": "2026-01-26",
        "certification_date": "2026-01-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "171M00000X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Case Manager/Care Coordinator",
            "state": "CA",
            "license": "136529",
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Social Worker, Clinical",
            "state": "CA",
            "license": "136529",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "LCSW",
            "identifier": "136529",
            "state": "CA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MSW",
            "identifier": "211Y-W011-SCNX",
            "state": "CA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "ASW",
            "identifier": "104780",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Charles E. Irwin Jr., M.D.
• Colleen Irwin, NP
• Cynthia Johnson Irwin, R.N.
• David Howard Irwin, MD
• Jordyn Nicole Irwin, MD
• Angela D Isaac, PT
• Jessica Isaac
• Alan Isaacs
• Alyson Isaacs, LCSW
• Dawn Louise Isaacs, RN, NP

• Clinical Social Worker in San Francisco, CA
• Providers in San Francisco, CA by specialty
• Clinical Social Worker in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 26, 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.