Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Katherine Jean Williams, PAC

Physician Assistant in Thousand Oaks, CA · enumerated 2007.

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

National Provider Identifier

1861689390

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Registry record

Entity type Individual (Type 1)

Name Katherine Jean Williams

Credential PAC

Sex Female

Practice address 375 Rolling Oaks Dr, Suite 210, Thousand Oaks, CA, 91361

Phone (805) 497-7015

Fax (805) 497-7315

Enumeration date Sep 28, 2007

Last updated in NPPES Feb 7, 2017

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 2007028606 (MO) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 53416 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Katherine Williams?

The National Provider Identifier (NPI) for Katherine Williams is 1861689390, a Type 1 (individual) record in the CMS NPPES registry.

Where does Katherine Williams practice?

The practice location on file with NPPES is in Thousand Oaks, 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 2017-02-07.