Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jessica Marie Williams

Behavior Analyst in San Marcos, CA · enumerated 2018.

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

National Provider Identifier

1538660030

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Registry record

Entity type Individual (Type 1)

Name Jessica Marie Williams

Sex Female

Practice address 334 Via Vera Cruz Ste 107, San Marcos, CA, 92078

Phone (760) 304-5010

Enumeration date Feb 21, 2018

Last updated in NPPES Feb 21, 2018

Taxonomy & licenses

103K00000X Behavior Analyst Behavioral Health & Social Service Providers · License 00001246 (CA) Primary

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

What is the NPI number for Jessica Williams?

The National Provider Identifier (NPI) for Jessica Williams is 1538660030, a Type 1 (individual) record in the CMS NPPES registry.

Where does Jessica Williams practice?

The practice location on file with NPPES is in San Marcos, 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 2018-02-21.