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

Mr. Bruce Warren Matsen, L.C.S.W.

Clinical Social Worker in Glendale, CA · enumerated 2015.

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

National Provider Identifier

1417343187

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Registry record

Entity type Individual (Type 1)

Name Mr. Bruce Warren Matsen

Credential L.C.S.W.

Sex Male

Practice address Glendale, CA, 91207

Phone (818) 726-6876

Fax (818) 500-1123

Enumeration date Apr 9, 2015

Last updated in NPPES Apr 9, 2015

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 LCSW13393 (CA) Primary

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

Is NPI 1417343187 active?

Yes, as of the latest NPPES snapshot, NPI 1417343187 is active (record last updated 2015-04-09).

How do I verify Bruce Matsen's NPI record?

Cross-check NPI 1417343187 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 2015-04-09.