Marshfield Clinic Health System, Inc.
ent_019fcd453e1bbd52c988cb8a1d340380
Disclosures
2
HHS OCR · State AG · 2 jurisdictions
Multi-filing incidents
1
incidents joining 2+ filings here
Max affected reported
35,952
nationwide · HHS OCR WI
Leak-site claims
0
none in sample
Identity resolution
- Canonical name
- Marshfield Clinic Health System, Inc.
- Normalized
- marshfield clinic health system— dedupe via name-norm; Microsoft / MSFT collapse to one row
- GLEIF LEI
- 2549003O8PPHLLPAKT93
- SEC EDGAR CIK
- None — not an SEC registrant
- Domain
- None on record
Disclosure history (2)newest first
- WISCONSINHHS OCRas victim2025-11-07
Marshfield Clinic Health System reported to HHS on 2025-11-07 a Hacking/IT Incident affecting 35952 individuals. Breached information located on Email.
- Illinois State AGas victim2025-11-01
MARSHFIELD CLINIC HEALTH SYSTEM filed a data-breach notice with the Illinois Attorney General in November 2025 (case 25-11-573). The register records the breach as discovered on September 25, 2025. Personal information types reported: medical information. Illinois does not publish the number of people affected — 815 ILCS 530/10 permits the Attorney General to publish only the entity name, the types of personal information and the date range.