NPI Portal NPI Lookup & Verification

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

Christopher A Duffey, RN

Registered Nurse in Ayer, MA · enumerated 2025.

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

National Provider Identifier

1578455754

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Registry record

Entity type Individual (Type 1)
Name Christopher A Duffey
Credential RN
Sex Male
Practice address Ayer, MA, 01434
Phone (978) 796-1000
Enumeration date Jul 21, 2025
Last updated in NPPES Jul 21, 2025

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

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License RN2324538 (MA) 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.

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Frequently asked questions

How do I verify Christopher Duffey's NPI record?
Cross-check NPI 1578455754 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1578455754 active?
Yes, as of the latest NPPES snapshot, NPI 1578455754 is active (record last updated 2025-07-21).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-07-21.