Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mervin J Langley, LCSW

Clinical Social Worker in Lake Geneva, WI · enumerated 2007.

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

National Provider Identifier

1932317831

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Registry record

Entity type Individual (Type 1)

Name Dr. Mervin J Langley

Credential LCSW

Sex Male

Practice address 146 E Geneva Sq, Lake Geneva, WI, 53147

Phone (877) 666-7223

Enumeration date May 21, 2007

Last updated in NPPES Mar 15, 2024

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 2853 (WI) 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
39632300	Medicaid	WI	-

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

Where does Mervin Langley practice?

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

What is the NPI number for Mervin Langley?

The National Provider Identifier (NPI) for Mervin Langley is 1932317831, 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 2024-03-15.