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

Mary Castonguay, RN, IBCLC

Lactation Consultant (Registered Nurse) in Redford, MI · enumerated 2025.

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

National Provider Identifier

1083574255

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Registry record

Entity type Individual (Type 1)

Name Mary Castonguay

Credential RN, IBCLC

Sex Female

Practice address Redford, MI, 48239

Phone (248) 920-4136

Enumeration date Nov 12, 2025

Last updated in NPPES Nov 12, 2025

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

Taxonomy & licenses

163WL0100X Lactation Consultant (Registered Nurse) Nursing Service Providers · License 4704144289 (MI) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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

Where does Mary Castonguay practice?

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

What is the NPI number for Mary Castonguay?

The National Provider Identifier (NPI) for Mary Castonguay is 1083574255, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-12.