Heather Dawn Onishea, CASAC-T

Primary specialty

Addiction (Substance Use Disorder) CounselorTaxonomy code 101YA0400X

License

40559 Issued in NY

Practice address

400 Crooked Hill Rd
Brentwood, NY 11717-1039

Phone

(631) 231-3232

NPI assigned

Mar 27, 2026

Sex

Female

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

Practice roles

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Outreach Development Corperation

  • Nursing Care Agency
  • Brentwood, NY
  • NPI 1922639178
  NPD (past)

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

{
    "created_epoch": "1774569600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1774569600000",
    "number": "1831038355",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "832 UDALL RD",
            "city": "WEST ISLIP",
            "state": "NY",
            "postal_code": "117951405",
            "telephone_number": "631-521-1575"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "400 CROOKED HILL RD",
            "city": "BRENTWOOD",
            "state": "NY",
            "postal_code": "117171039",
            "telephone_number": "631-231-3232"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ONISHEA",
        "first_name": "HEATHER",
        "middle_name": "DAWN",
        "credential": "CASAC-T",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2026-03-27",
        "last_updated": "2026-03-27",
        "certification_date": "2026-03-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YA0400X",
            "taxonomy_group": "",
            "desc": "Counselor, Addiction (Substance Use Disorder)",
            "state": "NY",
            "license": "40559",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Cynthia Okolski, L.A.C.S.W.-R
• Adesuwa Juile Olaofe, R.N.
• Jennifer Ann Olivella, FNP
• Rachel Olmeda
• Olympic Orthopedics, PC
• Pearl K Onwuzo
• Belinda Opperman, LPN
• Optima Care Brentwood LLC
• Optimum Podiatry Group PLLC
• Celeste Orlandi

• Addiction (Substance Use Disorder) Counselor in Brentwood, NY
• Providers in Brentwood, NY by specialty
• Addiction (Substance Use Disorder) Counselor in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 27, 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.