Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gregory N Wiersema, MST-CCC/A
Audiologist in Fond Du Lac, WI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1831195361
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Registry record
Entity type Individual (Type 1)
Name Gregory N Wiersema
Credential MST-CCC/A
Sex Male
Practice address 221 Fond Du Lac Ave, Fond Du Lac, WI, 54935
Phone (920) 923-4678
Fax (920) 923-4678
Enumeration date Jun 21, 2005
Last updated in NPPES Sep 11, 2025
Taxonomy & licenses
237600000X Audiologist-Hearing Aid Fitter Speech, Language and Hearing Service Providers · License 55-156 (WI) Secondary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 41105900 | 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.
Frequently asked questions
Is NPI 1831195361 active?
Yes, as of the latest NPPES snapshot, NPI 1831195361 is active (record last updated 2025-09-11).
How do I verify Gregory Wiersema's NPI record?
Cross-check NPI 1831195361 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.