Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mr. William Daniel Dease III, OTR

Pediatric Occupational Therapist in Syosset, NY · enumerated 2010.

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

National Provider Identifier

1518285287

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Registry record

Entity type Individual (Type 1)

Name Mr. William Daniel Dease III

Credential OTR

Sex Male

Practice address Syosset, NY, 11791

Phone (631) 600-3029

Fax (800) 783-5909

Enumeration date May 5, 2010

Last updated in NPPES Feb 28, 2017

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

225X00000X Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 007477 (NY) Secondary

225XE0001X Environmental Modification Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 007477 (NY) Secondary

225XE1200X Ergonomics Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 007477 (NY) Secondary

225XF0002X Feeding, Eating & Swallowing Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 007477 (NY) Secondary

225XG0600X Gerontology Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 007477 (NY) Secondary

225XN1300X Neurorehabilitation Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 007477 (NY) Secondary

225XP0019X Physical Rehabilitation Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 007477 (NY) Secondary

225XP0200X Pediatric Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 007477 (NY) Primary

225XR0403X Driving and Community Mobility Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 007477 (NY) Secondary

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

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.

What specialty is William Dease?

William Dease is registered in NPPES with the primary taxonomy of Pediatric Occupational Therapist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-02-28.