Ronald S. Merritt, RADT 1

Primary specialty

Addiction (Substance Use Disorder) CounselorTaxonomy code 101YA0400X

License

R1581520924 Issued in CA

Practice address

73 N 2ND Ave
Chula Vista, CA 91910-1124

Phone

(619) 426-4801

Fax

(619) 426-0034

NPI assigned

Apr 14, 2025

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": "1744588800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1744588800000",
    "number": "1639964059",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1616 9TH AVE APT 5",
            "city": "SAN DIEGO",
            "state": "CA",
            "postal_code": "921012852",
            "telephone_number": "619-714-0608",
            "fax_number": "619-426-0034"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "73 N 2ND AVE",
            "city": "CHULA VISTA",
            "state": "CA",
            "postal_code": "919101124",
            "telephone_number": "619-426-4801",
            "fax_number": "619-426-0034"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MERRITT",
        "first_name": "RONALD",
        "middle_name": "S.",
        "credential": "RADT 1",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2025-04-14",
        "last_updated": "2025-04-14",
        "certification_date": "2025-04-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YA0400X",
            "taxonomy_group": "",
            "desc": "Counselor, Addiction (Substance Use Disorder)",
            "state": "CA",
            "license": "R1581520924",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Maria M. Mercado, M.D.
• Olga Mercado
• Zayra Mercado
• Celina Armenta Mercedes, MS, OTR/L
• Keith Roshanali Merchant, D.D.S.
• Alyssa Mesa
• Melvin Jocson Mesa
• Sharon Marconi Messier, CCC-SLP
• Metropolitan Area Advisory Committee on Anti-Poverty of San Diego County, Inc. (Nosotros)
• Enrique Metta Fallena, OPTICIAN

• Addiction (Substance Use Disorder) Counselor in Chula Vista, CA
• Providers in Chula Vista, 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 14, 2025; 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.