Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mary Diane Wiatrowski, MSW, LCSW
Social Worker in Oshkosh, WI · enumerated 2017.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1457870644
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Registry record
Entity type Individual (Type 1)
Name Mary Diane Wiatrowski
Credential MSW, LCSW
Sex Female
Practice address 404 N Main St Ste 612, Oshkosh, WI, 54901
Phone (920) 385-1420
Fax (866) 327-3295
Enumeration date Sep 19, 2017
Last updated in NPPES Jul 11, 2018
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License 4176-123 (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.
Frequently asked questions
What specialty is Mary Wiatrowski?
Mary Wiatrowski is registered in NPPES with the primary taxonomy of Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-07-11.