William Francis Owen Jr., M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

G31385 Issued in CA

Practice address

45 Castro St
Ste 402
San Francisco, CA 94114-1027

Phone

(415) 861-2400

Fax

(415) 861-8733

NPI assigned

May 31, 2005

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

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

{
    "created_epoch": "1117497600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1154323483",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "45 CASTRO ST",
            "address_2": "STE 402",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941141027",
            "telephone_number": "415-861-2400",
            "fax_number": "415-861-8733"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "45 CASTRO ST",
            "address_2": "STE 402",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941141027",
            "telephone_number": "415-861-2400",
            "fax_number": "415-861-8733"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "OWEN",
        "first_name": "WILLIAM",
        "middle_name": "FRANCIS",
        "name_prefix": "Dr.",
        "name_suffix": "Jr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-05-31",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "G31385",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00G313850",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Jason Edward Owen, PH.D., M.P.H.
• Louis Owen
• Mary C. Owen, NP
• Robert Leo Owen, M.D.
• Stephanie Amy Owen, LMFT
• Abdul Rahim Owens I
• Adrian Pilar Owens
• Chaz Julius Owens
• Chelsea Owens, LMFT, ATR-BC
• Christopher D Owens, M.D.

• Internal Medicine Physician in San Francisco, CA
• Providers in San Francisco, CA by specialty
• Internal Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.