John Calvin O'Neil Jr., LCSW, LADC

Primary specialty

Clinical Social WorkerTaxonomy code 1041C0700X

License

012916 Issued in CT

Practice address

86 Cherry St FL 2
Milford, CT 06460-3413

Phone

(203) 249-7837

NPI assigned

Dec 10, 2024

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 3

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": "1733788800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1759449600000",
    "number": "1457167769",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "86 CHERRY ST FL 2",
            "city": "MILFORD",
            "state": "CT",
            "postal_code": "064603413",
            "telephone_number": "203-249-7837"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "86 CHERRY ST FL 2",
            "city": "MILFORD",
            "state": "CT",
            "postal_code": "064603413",
            "telephone_number": "203-249-7837"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'NEIL",
        "first_name": "JOHN",
        "middle_name": "CALVIN",
        "name_suffix": "Jr.",
        "credential": "LCSW, LADC",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2024-12-10",
        "last_updated": "2025-10-03",
        "certification_date": "2025-10-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "VT",
            "license": "089.0136543TELE",
            "primary": false
        },
        {
            "code": "101YA0400X",
            "taxonomy_group": "",
            "desc": "Counselor, Addiction (Substance Use Disorder)",
            "state": "CT",
            "license": "001419",
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "CT",
            "license": "012916",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Charles Wheeler O'Connell, CPT
• Tara S O'Connell, P.T.
• Ashley O'Connor, LMSW
• Louisa O'Grady, MS RD CDE CD-N
• Michael James O'Keefe, RPH
• Patricia O'Neil, CRNA
• John O'Rourke, LCSW
• Kailee Oakes
• Mary Lou Oates, LCSW
• OB GYN Physicians, P.C.

• Clinical Social Worker in Milford, CT
• Providers in Milford, CT by specialty
• Clinical Social Worker in Connecticut

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 3, 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.