Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Hennessy

Physical Therapy Assistant in Crystal Lake, IL · enumerated 2023.

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

National Provider Identifier

1700661352

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Registry record

Entity type Individual (Type 1)

Name William Hennessy

Sex Male

Practice address 471 W Terra Cotta Ave, Crystal Lake, IL, 60014

Phone (815) 526-0040

Enumeration date Aug 30, 2023

Last updated in NPPES Aug 30, 2023

Taxonomy & licenses

225200000X Physical Therapy Assistant Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 160009917 (IL) 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

How do I verify William Hennessy's NPI record?

Cross-check NPI 1700661352 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1700661352 active?

Yes, as of the latest NPPES snapshot, NPI 1700661352 is active (record last updated 2023-08-30).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-08-30.