Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Ms. Catherine Lynn Holland, MS CCC A

Audiologist in Milwaukee, WI · enumerated 2006.

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

National Provider Identifier

1619053048

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Registry record

Entity type Individual (Type 1)

Name Ms. Catherine Lynn Holland

Credential MS CCC A

Sex Female

Practice address Milwaukee, WI, 53201

Phone (414) 266-2997

Fax (414) 266-6189

Enumeration date Oct 27, 2006

Last updated in NPPES Jul 8, 2007

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

231H00000X Audiologist Speech, Language and Hearing Service Providers · License 114-156 (WI) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Catherine Holland?

The National Provider Identifier (NPI) for Catherine Holland is 1619053048, a Type 1 (individual) record in the CMS NPPES registry.

Where does Catherine Holland practice?

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

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