Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Eileen Margaret Defonzo

Specialist in Massapequa Park, NY · enumerated 2018.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1528559390

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Registry record

Entity type Individual (Type 1)

Name Eileen Margaret Defonzo

Sex Female

Practice address 34 Joludow Dr, Massapequa Park, NY, 11762

Phone (631) 645-6102

Enumeration date May 28, 2018

Last updated in NPPES Jun 12, 2025

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 2557172 (NY) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Eileen Defonzo?

The National Provider Identifier (NPI) for Eileen Defonzo is 1528559390, a Type 1 (individual) record in the CMS NPPES registry.

Where does Eileen Defonzo practice?

The practice location on file with NPPES is in Massapequa Park, NY. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-06-12.