Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Cortney D Birschbach, OD

Optometrist in Fond Du Lac, WI · enumerated 2019.

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

National Provider Identifier

1376105700

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Registry record

Entity type Individual (Type 1)

Name Cortney D Birschbach

Credential OD

Sex Female

Practice address 355 N Peters Ave, Fond Du Lac, WI, 54935

Phone (920) 922-7121

Enumeration date Jul 6, 2019

Last updated in NPPES Apr 17, 2020

Taxonomy & licenses

152WC0802X Corneal and Contact Management Optometrist Eye and Vision Services Providers · License 3576-35 (WI) Secondary

152W00000X Optometrist Eye and Vision Services Providers · License 3576-35 (WI) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

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

How do I verify Cortney Birschbach's NPI record?

Cross-check NPI 1376105700 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1376105700 active?

Yes, as of the latest NPPES snapshot, NPI 1376105700 is active (record last updated 2020-04-17).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-04-17.