Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Matthew Larsen, MS ATC, CSCS

Athletic Trainer in La Mirada, CA · enumerated 2020.

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

National Provider Identifier

1295356293

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Registry record

Entity type Individual (Type 1)

Name Matthew Larsen

Credential MS ATC, CSCS

Sex Male

Practice address 13800 Biola Ave, La Mirada, CA, 90639

Phone (000) 000-0000

Enumeration date Apr 30, 2020

Last updated in NPPES May 11, 2026

Taxonomy & licenses

2255A2300X Athletic Trainer Respiratory, Developmental, Rehabilitative and Restorative Service Providers 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

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.

What specialty is Matthew Larsen?

Matthew Larsen is registered in NPPES with the primary taxonomy of Athletic Trainer. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-11.