Mary Ann Defalco, NP

Primary specialty

Nurse PractitionerTaxonomy code 363L00000X

License

F3042641 Issued in NY

Practice address

540 Union Blvd
West Islip, NY 11795

Phone

(631) 669-2555

NPI assigned

Jan 5, 2006

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)

Enrolled

Credentials

Nurse Practitioner

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.

• St Francis Hospital United States Catholic Conference

  • General Acute Care Hospital
  • Roslyn, NY
  • NPI 1750439030
  NPD (past)

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

{
    "created_epoch": "1136419200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1144208570",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "540 UNION BLVD",
            "city": "WEST ISLIP",
            "state": "NY",
            "postal_code": "11795",
            "telephone_number": "631-669-2555",
            "fax_number": "631-669-5787"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "540 UNION BLVD",
            "city": "WEST ISLIP",
            "state": "NY",
            "postal_code": "11795",
            "telephone_number": "631-669-2555"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DEFALCO",
        "first_name": "MARY ANN",
        "credential": "NP",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-01-05",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "NY",
            "license": "F3042641",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Susan Day, PA
• Soma Deall-Williams, DO
• Samantha Dean
• Eric Decena, M.D.
• Richard Declue, PA
• Philip D Degaetano, D.O.
• Cathleen Degarmo
• Melissa E Deleski, RPA-C
• Michele Delgado
• Anthony Delicce, MD

• Nurse Practitioner in West Islip, NY
• Providers in West Islip, NY by specialty
• Nurse Practitioner in New York

• 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.