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

Mary Allen, LCSW

Q: What is the NPI number for Mary Allen?

The National Provider Identifier (NPI) for Mary Allen is 1659500882, a Type 1 (individual) record in the CMS NPPES registry.

Clinical Social Worker in Stoughton, WI · enumerated 2009.

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

National Provider Identifier

1659500882

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Registry record

Entity type Individual (Type 1)

Name Mary Allen

Credential LCSW

Sex Female

Practice address Stoughton, WI, 53589

Phone (608) 449-7201

Enumeration date Jul 9, 2009

Last updated in NPPES Apr 9, 2020

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 8198-123 (WI) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License LCS29109 (CA) 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
16-59500882	Medicaid	WI	-
HE611A	Other	CA	MEDICARE PART B PROVIDER PTAN
LCSW 8198-123	Other	WI	STATE OF WISC-DEPT OF SAFETY & PROFESSIONAL SERVICES
LCS29109	Other	CA	BOARD OF BEHAVIORAL SCIENCE

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

What is the NPI number for Mary Allen?

The National Provider Identifier (NPI) for Mary Allen is 1659500882, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mary Allen practice?

The practice location on file with NPPES is in Stoughton, WI. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-04-09.