Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marci Frances Witkowski, LMSW

Clinical Social Worker in Greenville, MI · enumerated 2016.

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

National Provider Identifier

1972057081

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Registry record

Entity type Individual (Type 1)

Name Marci Frances Witkowski

Credential LMSW

Sex Female

Practice address 1202 W Oak St, Greenville, MI, 48838

Phone (616) 754-2944

Enumeration date Aug 5, 2016

Last updated in NPPES Jan 26, 2026

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 6801100020 (MI) Primary

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 Marci Witkowski practice?

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

What is the NPI number for Marci Witkowski?

The National Provider Identifier (NPI) for Marci Witkowski is 1972057081, 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 2026-01-26.