Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Donna Marie Grennan, SLP

Speech-Language Pathologist in Wantagh, NY · enumerated 2011.

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

National Provider Identifier

1538446836

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Registry record

Entity type Individual (Type 1)

Name Mrs. Donna Marie Grennan

Credential SLP

Sex Female

Practice address 2850 N Jerusalem Rd, Wantagh, NY, 11793

Phone (516) 396-2900

Enumeration date Nov 15, 2011

Last updated in NPPES Nov 15, 2011

Taxonomy & licenses

235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License 009726 (NY) Primary

SLP · Speech-Language Pathologist: A licensed clinician treating speech, language, and swallowing disorders. About the SLP credential

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 specialty is Donna Grennan?

Donna Grennan is registered in NPPES with the primary taxonomy of Speech-Language Pathologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-11-15.