Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Lawrence Joseph Sieve III, O.D.

Optometrist in Santa Ana, CA · enumerated 2014.

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

National Provider Identifier

1225443732

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Registry record

Entity type Individual (Type 1)

Name Lawrence Joseph Sieve III

Credential O.D.

Sex Male

Practice address 1206 E 17th St Ste 101, Santa Ana, CA, 92701

Phone (714) 352-2911

Fax (714) 352-2903

Enumeration date Jun 23, 2014

Last updated in NPPES May 29, 2025

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 1990 (KS) 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

What is the NPI number for Lawrence Sieve?

The National Provider Identifier (NPI) for Lawrence Sieve is 1225443732, a Type 1 (individual) record in the CMS NPPES registry.

Where does Lawrence Sieve practice?

The practice location on file with NPPES is in Santa Ana, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-05-29.