Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Guillermo Salvador Castillo, D.D.S.

General Practice Dentistry in Hemet, CA · enumerated 2006.

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

National Provider Identifier

1003916818

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Registry record

Entity type Individual (Type 1)

Name Dr. Guillermo Salvador Castillo

Credential D.D.S.

Sex Male

Practice address 930 E Florida Ave, Suite B, Hemet, CA, 92543

Phone (951) 652-1312

Fax (951) 652-0771

Enumeration date Sep 22, 2006

Last updated in NPPES Aug 20, 2008

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 50896 (CA) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

Other identifiers

Identifier	Type	State	Issuer
G 94099-01	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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Guillermo Castillo?

Guillermo Castillo is registered in NPPES with the primary taxonomy of General Practice Dentistry. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-08-20.