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

Troy Williamson

Physician Assistant in Los Alamitos, CA · enumerated 2023.

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

National Provider Identifier

1750166591

Verified

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Registry record

Entity type Individual (Type 1)

Name Troy Williamson

Sex Male

Practice address Los Alamitos, CA, 90720

Phone (562) 598-1311

Enumeration date Aug 29, 2023

Last updated in NPPES Jan 27, 2024

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

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA63942 (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

Where does Troy Williamson practice?

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

What is the NPI number for Troy Williamson?

The National Provider Identifier (NPI) for Troy Williamson is 1750166591, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-01-27.