Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Nathan T Schlotthauer, OD

Optometrist in Janesville, WI · enumerated 2011.

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

National Provider Identifier

1790064947

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Registry record

Entity type Individual (Type 1)

Name Nathan T Schlotthauer

Credential OD

Sex Male

Practice address 3200 E Racine St, Janesville, WI, 53546

Phone (608) 371-8000

Fax (608) 371-8938

Enumeration date Aug 5, 2011

Last updated in NPPES Dec 8, 2020

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 3437-35 (WI) Primary

152W00000X Optometrist Eye and Vision Services Providers · License 4901004654 (MI) Secondary

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

Other identifiers

Identifier	Type	State	Issuer
1790064947	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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Nathan Schlotthauer?

Nathan Schlotthauer is registered in NPPES with the primary taxonomy of Optometrist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-12-08.