Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Sierra Rose Castonguay, MS, LAT, ATC

Athletic Trainer in Portland, ME · enumerated 2025.

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

National Provider Identifier

1740089606

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Registry record

Entity type Individual (Type 1)

Name Sierra Rose Castonguay

Credential MS, LAT, ATC

Sex Female

Practice address 96 Falmouth St, Portland, ME, 04103

Phone (800) 800-4876

Enumeration date Mar 12, 2025

Last updated in NPPES Jan 10, 2026

Taxonomy & licenses

2255A2300X Athletic Trainer Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License AT992 (ME) Primary

2255A2300X Athletic Trainer Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 1626 (NH) Secondary

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 Sierra Castonguay?

The National Provider Identifier (NPI) for Sierra Castonguay is 1740089606, a Type 1 (individual) record in the CMS NPPES registry.

Where does Sierra Castonguay practice?

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

Other providers at this practice address

Browse all →

Rosemary Johnson Adult Health Nurse Practitioner · Portland, ME NPI 1831308238 Keith Danner Mental Health Counselor · Portland, ME NPI 1043453483 Anna Gowdy Professional Counselor · Portland, ME NPI 1902105497 Sarah Kelly Professional Counselor · Portland, ME NPI 1033766589 Victoria Libby Clinical Psychologist · Portland, ME NPI 1740837293 Alyson Kendrick Athletic Trainer · Portland, ME NPI 1114703048 Nickolas Silva Student in an Organized Health Care Education/Training Program · Portland, ME NPI 1396699096

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-10.