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

Ms. Margaret Marie Bayer, LCSW

Clinical Social Worker in Elm Grove, WI · enumerated 2011.

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

National Provider Identifier

1578860052

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Registry record

Entity type Individual (Type 1)

Name Ms. Margaret Marie Bayer

Credential LCSW

Sex Female

Practice address Elm Grove, WI, 53122

Phone (262) 780-1020

Fax (262) 780-1022

Enumeration date Feb 18, 2011

Last updated in NPPES Sep 10, 2024

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 7422-123 (WI) 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

How do I verify Margaret Bayer's NPI record?

Cross-check NPI 1578860052 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1578860052 active?

Yes, as of the latest NPPES snapshot, NPI 1578860052 is active (record last updated 2024-09-10).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-09-10.