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

Duane Ivan Kirk, O.D.

Optometrist in Ripon, CA · enumerated 2006.

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

National Provider Identifier

1457416190

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Registry record

Entity type Individual (Type 1)

Name Duane Ivan Kirk

Credential O.D.

Sex Male

Practice address Ripon, CA, 95366

Phone (209) 599-3115

Fax (209) 599-3793

Enumeration date Dec 22, 2006

Last updated in NPPES Jul 9, 2012

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

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 6477T (CA) Primary

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
SD0064771	Medicaid	CA	-

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

How do I verify Duane Kirk's NPI record?

Cross-check NPI 1457416190 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1457416190 active?

Yes, as of the latest NPPES snapshot, NPI 1457416190 is active (record last updated 2012-07-09).

Other providers at this practice address

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Tyler Kirk Optometrist · Ripon, CA NPI 1215216874

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-07-09.