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

Vincent A Duffy, LCSW

Clinical Social Worker in Dover, NH · enumerated 2006.

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

National Provider Identifier

1841301835

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Registry record

Entity type Individual (Type 1)

Name Vincent A Duffy

Credential LCSW

Sex Male

Practice address Dover, NH, 03820

Phone (603) 767-2230

Fax (603) 742-0301

Enumeration date Aug 31, 2006

Last updated in NPPES Feb 7, 2019

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 1258 (NH) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

Other identifiers

Identifier	Type	State	Issuer
431682799	Medicaid	ME	-

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 1841301835 active?

Yes, as of the latest NPPES snapshot, NPI 1841301835 is active (record last updated 2019-02-07).

How do I verify Vincent Duffy's NPI record?

Cross-check NPI 1841301835 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-02-07.