Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Patricia Holzbauer, CSW

Clinical Social Worker in Niagara, WI · enumerated 2007.

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

National Provider Identifier

1447385133

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Registry record

Entity type Individual (Type 1)

Name Mary Patricia Holzbauer

Credential CSW

Sex Female

Practice address 1201 Jackson St, Marinette County Health and Human Services, Niagara, WI, 54151

Phone (715) 732-7760

Fax (715) 732-7711

Enumeration date Feb 22, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 3469120 (WI) Primary

Other identifiers

Identifier	Type	State	Issuer
3469120	Other	WI	CSW

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

Is NPI 1447385133 active?

Yes, as of the latest NPPES snapshot, NPI 1447385133 is active (record last updated 2007-07-08).

How do I verify Mary Holzbauer's NPI record?

Cross-check NPI 1447385133 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Elizabeth Allin Clinical Psychologist · Niagara, WI NPI 1477595270 George Thottakara Clinical Social Worker · Niagara, WI NPI 1013006329

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.