Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William T. Hennessy, MD

Urology Physician in Danbury, CT · enumerated 2005.

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

National Provider Identifier

1114922309

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Registry record

Entity type Individual (Type 1)

Name William T. Hennessy

Credential MD

Sex Male

Practice address 51-53 Kenosia Ave, Danbury, CT, 06810

Phone (203) 748-0330

Fax (203) 731-3273

Enumeration date Jun 15, 2005

Last updated in NPPES Jul 9, 2007

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 243023 (CT) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
1243203	Medicaid	CT	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does William Hennessy practice?

The practice location on file with NPPES is in Danbury, CT. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Hennessy?

The National Provider Identifier (NPI) for William Hennessy is 1114922309, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.