Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Christopher J Castonguay, DMD

Dentist in Millinocket, ME · enumerated 2018.

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

National Provider Identifier

1477046571

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Registry record

Entity type Individual (Type 1)

Name Christopher J Castonguay

Credential DMD

Sex Male

Practice address 50 Summer St, Millinocket, ME, 04462

Phone (207) 528-2285

Fax (207) 528-2880

Enumeration date Jun 13, 2018

Last updated in NPPES Jun 13, 2018

Taxonomy & licenses

122300000X Dentist Dental Providers · License DEN4640 (ME) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD 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

Is NPI 1477046571 active?

Yes, as of the latest NPPES snapshot, NPI 1477046571 is active (record last updated 2018-06-13).

How do I verify Christopher Castonguay's NPI record?

Cross-check NPI 1477046571 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-06-13.