HHS OCR report · 2023
County of Rock, WI data breach
OCR report facts
- Covered entity
- County of Rock, WI
- Entity type
- Healthcare Provider
- State
- Wisconsin
- Individuals affected
- 10,853
- Submission date
- Nov 29, 2023
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
The covered entity (CE), County of Rock, WI, reported that it experienced a ransomware attack affecting the protected health information (PHI) of 10,853 individuals. The PHI involved included names, addresses, dates of birth, drivers’ license and social security numbers, diagnoses, conditions, lab results, medications, and claims and financial information. The CE notified HHS, the affected individuals, and the media. In response to the breach, the CE provided complimentary credit monitoring s...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the County of Rock, WI data breach?
The report to HHS OCR lists 10,853 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Nov 29, 2023.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Network Server.
Is the investigation still open?
No. The report is in the OCR portal archive, which holds reports where OCR has closed its review.
Is a breach notice letter from County of Rock, WI legitimate?
This site cannot verify letters. Check the sender against the organisation's official website and the HHS OCR breach portal, and avoid calling numbers or clicking links only listed in an unexpected message. See our guide on what to do after a data breach notice.
Source: HHS OCR Breach Portal, OCR export October 2026. Network USA is not affiliated with HHS or County of Rock, WI.