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

Caitlin Williams, LMFT

Marriage & Family Therapist in Fullerton, CA · enumerated 2016.

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

National Provider Identifier

1750836573

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Registry record

Entity type Individual (Type 1)

Name Caitlin Williams

Credential LMFT

Sex Female

Practice address Fullerton, CA, 92832

Phone (909) 915-5445

Enumeration date Aug 22, 2016

Last updated in NPPES Aug 22, 2016

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

Taxonomy & licenses

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License 86293 (CA) Primary

LMFT · Licensed Marriage and Family Therapist: A licensed therapist specializing in relational and family psychotherapy. About the LMFT 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

Where does Caitlin Williams practice?

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

What is the NPI number for Caitlin Williams?

The National Provider Identifier (NPI) for Caitlin Williams is 1750836573, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-08-22.