NPI Portal NPI Lookup & Verification

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

Mrs. Rosa Singer, MSW, LCSW

Clinical Social Worker in Simi Valley, CA · enumerated 2010.

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

National Provider Identifier

1366745861

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Registry record

Entity type Individual (Type 1)
Name Mrs. Rosa Singer
Credential MSW, LCSW
Sex Female
Practice address Simi Valley, CA, 93063
Phone (805) 587-8471
Enumeration date Dec 6, 2010
Last updated in NPPES Oct 24, 2021

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

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers · License ASW20427 (CA) Secondary
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 28441 (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.

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Frequently asked questions

Where does Rosa Singer practice?
The practice location on file with NPPES is in Simi Valley, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Rosa Singer?
The National Provider Identifier (NPI) for Rosa Singer is 1366745861, 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 2021-10-24.