DR. WILLIAM C HALLETT PHARM.D.
NPI 1043363690
Pharmacist - Psychiatric in Sea Cliff, NY

Q: What is William Hallett's NPI number?

The NPI number for William Hallett is 1043363690. It was assigned to this individual provider in the NPPES registry on January 18, 2007.

Q: What is William Hallett's specialty?

The primary specialty registered for this NPI is Pharmacist, specializing in Psychiatric, with taxonomy code 1835P1300X.

Q: When was this NPI record last updated?

The NPPES record for William Hallett was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since January 18, 2007

403 LITTLEWORTH LN, SEA CLIFF, NY 11579(516) 672-0195 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

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About Dr. William C Hallett Pharm.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. WILLIAM C HALLETT PHARM.D. (NPI 1043363690) is an individual psychiatric provider in Sea Cliff, New York, licensed in New York (035415-1) and active in the NPI registry since January 2007.

NPPES Registry Identity

NPI1043363690

Entity TypeIndividualMale

Primary Taxonomy1835P1300X

Provider Legal NameDR. WILLIAM C HALLETTCredential: PHARM.D.

Location Address403 LITTLEWORTH LNSea Cliff, NY 11579-1919

Mailing Address403 Littleworth LnSea Cliff, NY 11579-1919 · (516) 672-0195

Phone(516) 672-0195

Sole ProprietorYes

Enumeration DateJanuary 18, 2007

Last NPPES UpdateSeptember 11, 2025

✔ NPI 1043363690 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyPharmacist · PsychiatricPharmacy Service Providers

Taxonomy Code1835P1300X

License✔ Licensed in NY · 035415-1

Definition

A licensed pharmacist who has demonstrated specialized knowledge and skill in optimizing care of patients with psychiatric illness by assessing and monitoring patients, recognizing drug-induced problems, and recommending appropriate treatment plans.

Also ListedPharmacistTaxonomy 183500000X · License 035415-1 (NY)

Also ListedPharmacist · GeriatricTaxonomy 1835G0303X · License 035415-1 (NY)

Also ListedPharmacist · PharmacotherapyTaxonomy 1835P1200X · License 035415-1 (NY)

403 LITTLEWORTH LN, Sea Cliff, NY 11579

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Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Hallett's NPI number?

The NPI number for William Hallett is 1043363690. It was assigned to this individual provider in the NPPES registry on January 18, 2007.

Where is William Hallett located?

William Hallett practices at 403 Littleworth Ln, Sea Cliff, NY 11579. The listed phone number is (516) 672-0195.

What is William Hallett's specialty?

The primary specialty registered for this NPI is Pharmacist, specializing in Psychiatric, with taxonomy code 1835P1300X.

When was this NPI record last updated?

The NPPES record for William Hallett was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.