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Regulator-posted notice

Breach notice filed by Marshfield Clinic Health System (November 2025)

Organization named: Marshfield Clinic Health System Provisional: identity as filed, not yet matched to the directory
Type as the source lists it: Hacking/IT Incident

What the sources say

HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals) Primary notice

Posted on the HHS Office for Civil Rights breach portal with a submission date of Nov. 7, 2025.

Organization as reported
Marshfield Clinic Health System, WI
Entity type as reported
Healthcare Provider
Category as reported
Hacking/IT Incident
Location of information as reported
Email
Submission date
Nov. 7, 2025
Observed by BreachRecords
2026-10-18 16:15 UTC (revision 8556, row:448)
Archived copy
Held in the private archive (provenance)

Figures, per source

  • 35,952 individuals affected (total reported), according to the HHS Office for Civil Rights breach portal, source date Nov. 7, 2025, revision observed 2026-10-18.

Each figure is one source's figure with the basis that source gave. Figures from different sources are shown side by side and are not added, averaged or chosen between.

Timeline

Source dates are the dates the sources give. Observation dates are when BreachRecords recorded each revision.

  • Submission date (HHS Office for Civil Rights breach portal)
  • Observed by BreachRecords (revision 8556)
  • Approved by a reviewer

Organizations linked by a reviewer

  • Marshfield Clinic Health System Named as the covered entity Provisional: identity as filed, not yet matched to the directory Linked 2026-10-19, method provisional.

Archived evidence

  • 13279a2ac40f2c40d39c3e4233e913571fb691d16317c641603e764c41a13a95
    text/csv, 97,197 bytes, retrieved from HHS Office for Civil Rights breach portal, 2026-10-18 16:15 UTC. Archived privately · Provenance · Source page

Records reflect source filings as of the dates shown. BreachRecords is not a regulator.

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