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

Brittany Lee St. Martin, DPT, TPS, RYT

Physical Therapist in Portsmouth, NH · enumerated 2013.

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

National Provider Identifier

1821420340

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Registry record

Entity type Individual (Type 1)

Name Brittany Lee St. Martin

Credential DPT, TPS, RYT

Sex Female

Practice address Portsmouth, NH, 03801

Phone (401) 301-9361

Enumeration date Aug 7, 2013

Last updated in NPPES Jun 1, 2021

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

Taxonomy & licenses

225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 040.0094760 (VT) Secondary

225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License PT5925 (ME) Secondary

225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 3884 (NH) Primary

DPT · Doctor of Physical Therapy: A physical therapist holding the clinical doctorate now standard for the profession. About the DPT credential

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

How do I verify Brittany St. Martin's NPI record?

Cross-check NPI 1821420340 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1821420340 active?

Yes, as of the latest NPPES snapshot, NPI 1821420340 is active (record last updated 2021-06-01).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-01.