Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Antoinette Marie Larson, OTR

Occupational Therapist in Chesterfield, MO · enumerated 2007.

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

National Provider Identifier

1235273780

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Registry record

Entity type Individual (Type 1)

Name Mrs. Antoinette Marie Larson

Credential OTR

Sex Female

Practice address 384 Chateaugay Ln, Chesterfield, MO, 63017

Phone (314) 485-1180

Fax (314) 485-1160

Enumeration date Feb 17, 2007

Last updated in NPPES Jul 21, 2022

Taxonomy & licenses

225XP0200X Pediatric Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 000915 (MO) Secondary

225X00000X Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 000915 (MO) Primary

Other identifiers

Identifier	Type	State	Issuer
473528941	Medicaid	MO	-

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 Antoinette Larson?

The National Provider Identifier (NPI) for Antoinette Larson is 1235273780, a Type 1 (individual) record in the CMS NPPES registry.

Where does Antoinette Larson practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.