Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marcia Diffley

Speech-Language Pathologist in Floral Park, NY · enumerated 2008.

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

National Provider Identifier

1659543924

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Registry record

Entity type Individual (Type 1)

Name Marcia Diffley

Sex Female

Practice address 34 Crocus Ave, Floral Park, NY, 11001

Phone (516) 424-6690

Enumeration date Mar 27, 2008

Last updated in NPPES Mar 27, 2008

Taxonomy & licenses

235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License 01355-2 (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.

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Frequently asked questions

What is the NPI number for Marcia Diffley?

The National Provider Identifier (NPI) for Marcia Diffley is 1659543924, a Type 1 (individual) record in the CMS NPPES registry.

Where does Marcia Diffley practice?

The practice location on file with NPPES is in Floral 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 2008-03-27.