Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William J Holzhaeuser, AUD

Audiologist in Ashland, WI · enumerated 2005 · practices at Ent Professional Associates Sc.

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

National Provider Identifier

1003807322

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Registry record

Entity type Individual (Type 1)

Name Mr. William J Holzhaeuser

Credential AUD

Sex Male

Practice address 1625 Maple Ln, Suite 2, Ashland, WI, 54806

Phone (715) 682-9311

Fax (715) 682-2486

Enumeration date Nov 4, 2005

Last updated in NPPES Jan 20, 2017

Taxonomy & licenses

231H00000X Audiologist Speech, Language and Hearing Service Providers · License 83156 (WI) Primary

237600000X Audiologist-Hearing Aid Fitter Speech, Language and Hearing Service Providers · License 83156 (WI) Secondary

237700000X Hearing Instrument Specialist Speech, Language and Hearing Service Providers · License 83156 (WI) Secondary

AUD · Doctor of Audiology: A licensed audiologist diagnosing and treating hearing and balance disorders. About the AUD credential

Other identifiers

Identifier	Type	State	Issuer
41112900	Medicaid	WI	-

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 Holzhaeuser's NPI record?

Cross-check NPI 1003807322 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1003807322 active?

Yes, as of the latest NPPES snapshot, NPI 1003807322 is active (record last updated 2017-01-20).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-01-20.