NPI Portal NPI Lookup & Verification

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

Alan C Larsen, O.D.

Optometrist in San Angelo, TX · enumerated 2005.

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

National Provider Identifier

1689662058

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Registry record

Entity type Individual (Type 1)
Name Alan C Larsen
Credential O.D.
Sex Male
Practice address San Angelo, TX, 76901
Phone (325) 949-5750
Fax (325) 944-4082
Enumeration date Oct 11, 2005
Last updated in NPPES Dec 18, 2020

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 03962TG (TX) 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
0933640-01 Medicaid TX -

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 Alan Larsen's NPI record?
Cross-check NPI 1689662058 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1689662058 active?
Yes, as of the latest NPPES snapshot, NPI 1689662058 is active (record last updated 2020-12-18).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-12-18.