Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Cassandra M Twardzik, APSW
Social Worker in Janesville, WI · enumerated 2016.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1225494859
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Registry record
Entity type Individual (Type 1)
Name Cassandra M Twardzik
Credential APSW
Sex Female
Practice address 20 E Court St, Janesville, WI, 53545
Phone (608) 755-8923
Fax (608) 758-5761
Enumeration date Jan 12, 2016
Last updated in NPPES Jan 12, 2016
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License 129581-121 (WI) 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.
Frequently asked questions
Is NPI 1225494859 active?
Yes, as of the latest NPPES snapshot, NPI 1225494859 is active (record last updated 2016-01-12).
How do I verify Cassandra Twardzik's NPI record?
Cross-check NPI 1225494859 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-01-12.