Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William John Auer, OD

Optometrist in Dubuque, IA · enumerated 2021.

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

National Provider Identifier

1598334971

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Registry record

Entity type Individual (Type 1)

Name William John Auer

Credential OD

Sex Male

Practice address 1500 Associates Dr, Dubuque, IA, 52002

Phone (563) 584-4415

Enumeration date Jun 21, 2021

Last updated in NPPES Oct 8, 2024

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 4579ATI (OR) Secondary

152W00000X Optometrist Eye and Vision Services Providers · License 124540 (IA) 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.

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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 William Auer?

William Auer 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 2024-10-08.