Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory Todd Siebert, DC

Chiropractor in San Clemente, CA · enumerated 2006.

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

National Provider Identifier

1548366420

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Registry record

Entity type Individual (Type 1)

Name Gregory Todd Siebert

Credential DC

Sex Male

Practice address 1300 Avenida Vista Hermosa, San Clemente, CA, 92673

Phone (949) 366-0070

Fax (949) 492-4948

Enumeration date Sep 16, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License DC23370 (CA) Primary

DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC 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 Gregory Siebert?

The National Provider Identifier (NPI) for Gregory Siebert is 1548366420, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gregory Siebert practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.