County of Rock, WI

Disclosed Nov 29, 202310,853 affectedConfirmed

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 services and implemented additional administrative, technical, and security safeguards.

What is known

People affected	10,853 (as reported to HHS)
Disclosed	Nov 29, 2023
Attack	Hacking
Data exposed	NamesHealth
Sector	Government · US
Status	Confirmed

Sources

Official noticeago.vermont.gov

Vermont Attorney General: 2023-12-01 County of Rock, WI Data Breach Notice to Consumers

Official noticeocrportal.hhs.gov

HHS OCR breach report (archive, resolved): County of Rock, WI (Healthcare Provider, WI)

Notices filed

TotalNov 29, 2023

HHS archive10,853 people

Residents of VTDec 1, 2023

Vermont AGCount not stated

History of this record

attack2026-09-25

unknown to hackingby backfillSource

data_types2026-09-25

[] to ["names","health"]by backfillSource

records_basis2026-09-25

empty to hhsby backfillSource

records2026-09-25

empty to 10853by backfillSource

disclosed2026-09-25

2023-12-01 to 2023-11-29by backfillSource

summary2026-09-25

empty to 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’ licenby backfillSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (Vermont AG), confirmed by Vermont AG. Record counts are as reported. Not legal advice.

Everything about County of Rock, WI