William Henry Mazzarella Jr., COUNSELOR

Primary specialty

Addiction (Substance Use Disorder) Registered NurseTaxonomy code 163WA0400X

License

530630 Issued in CA

Practice address

2456 E St
San Diego, CA 92102-2024

Phone

(619) 503-7680

NPI assigned

Jun 11, 2007

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

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": "1181520000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1778976000000",
    "number": "1770787111",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2120 COLUMBIA ST STE 8",
            "city": "SAN DIEGO",
            "state": "CA",
            "postal_code": "921011879",
            "telephone_number": "619-380-0560"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2456 E ST",
            "city": "SAN DIEGO",
            "state": "CA",
            "postal_code": "921022024",
            "telephone_number": "619-503-7680"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MAZZARELLA",
        "first_name": "WILLIAM",
        "middle_name": "HENRY",
        "name_suffix": "Jr.",
        "credential": "COUNSELOR",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2007-06-11",
        "last_updated": "2026-05-17",
        "certification_date": "2026-05-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "163WA0400X",
            "taxonomy_group": "",
            "desc": "Registered Nurse, Addiction (Substance Use Disorder)",
            "state": "CA",
            "license": "530630",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Kelly Green Mazurek, M.D.
• Cameron A Mazza
• Katelyn Mazza, RD
• Monique Marie Mazza, N.D.
• Grace Mazzagatte, PA-S
• Peter M. Mazzarese, P.A.
• William J Mazzei, MD
• Gloria Rose Mazzella
• Gina Mazziotti
• Ivie Mazzola

• Addiction (Substance Use Disorder) Registered Nurse in San Diego, CA
• Providers in San Diego, CA by specialty
• Addiction (Substance Use Disorder) Registered Nurse in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 17, 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.