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

Kerry Lassen, L.C.S.W

Clinical Social Worker in Shelton, CT · enumerated 2006 · practices at Progressive Institute LLC.

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

National Provider Identifier

1477515823

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Registry record

Entity type Individual (Type 1)

Name Kerry Lassen

Credential L.C.S.W

Sex Female

Practice address Shelton, CT, 06484

Phone (203) 816-6424

Enumeration date Apr 3, 2006

Last updated in NPPES Nov 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 005707 (CT) 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
42-1643030	Other	CT	MULTIPLAN
004247088	Medicaid	CT	-
339452	Other	CT	MHN
140005707CT01	Other	CT	ANTHEM

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

Is NPI 1477515823 active?

Yes, as of the latest NPPES snapshot, NPI 1477515823 is active (record last updated 2019-11-07).

How do I verify Kerry Lassen's NPI record?

Cross-check NPI 1477515823 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Progressive Institute LLC Substance Use Disorder Rehabilitation Clinic/Center · Shelton, CT NPI 1669944724 Alison Glass Clinical Social Worker · Shelton, CT NPI 1730715004 Bion Harrigan Social Worker · Shelton, CT NPI 1780322453 Cyanne Stanley Mental Health Counselor · Shelton, CT NPI 1598646929 Andrew Keilty Addiction (Substance Use Disorder) Counselor · Shelton, CT NPI 1164378741

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-11-07.