DisclosureLens
UnknownOtherHealth (basic)Low

Marshfield Clinic Health System, Inc.

bd_51e104f254e1f381 · schema v1 · pii pii-v2

Severity

Low

Discovered

Sep 25, 2025

Filed

Nov 1, 2025

To disclose

—

Affected

Withheld by the regulator

Linked

2 filings

Confidence

95%
Full breach record for Marshfield Clinic Health System, Inc. →

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.

Incident timeline

Sep 25, 2025

Discovered

Nov 1, 2025

Filed

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Filing propagation · 2 filings · 2 states

View merged incident ↗
Illinois State AGNov 1 · first · this page
HHS OCR+6d

Pattern: first filing Nov 1 (IL), last Nov 7 (WI) — a 6-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.