Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Tirrell De Gannes, PSY.D.

Psychologist in Hicksville, NY · enumerated 2019.

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

National Provider Identifier

1336794742

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Registry record

Entity type Individual (Type 1)

Name Dr. Tirrell De Gannes

Credential PSY.D.

Sex Male

Practice address 400 S Oyster Bay Rd Ste 102, Hicksville, NY, 11801

Phone (516) 818-8383

Enumeration date Aug 3, 2019

Last updated in NPPES Aug 3, 2019

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 1629175039 (NY) Primary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD 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

How do I verify Tirrell De Gannes's NPI record?

Cross-check NPI 1336794742 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1336794742 active?

Yes, as of the latest NPPES snapshot, NPI 1336794742 is active (record last updated 2019-08-03).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-08-03.