Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Colin J Duffy

Q: What is the NPI number for Colin Duffy?

The National Provider Identifier (NPI) for Colin Duffy is 1669286639, a Type 1 (individual) record in the CMS NPPES registry.

Mental Health Counselor in Fenton, MI · enumerated 2025.

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

National Provider Identifier

1669286639

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Registry record

Entity type Individual (Type 1)

Name Colin J Duffy

Sex Male

Practice address 15173 North Rd Ste 100, Fenton, MI, 48430

Phone (810) 771-4074

Enumeration date Feb 1, 2025

Last updated in NPPES Feb 1, 2025

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 6451024015 (MI) Primary

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 Colin Duffy practice?

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

What is the NPI number for Colin Duffy?

The National Provider Identifier (NPI) for Colin Duffy is 1669286639, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-01.