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44 disclosed this week · 26,355 on record

University of Wisconsin Hospitals and Clinics Authority

Disclosed Jun 18, 20214,563 affectedConfirmed

Official notice

The covered entity (CE), University of Wisconsin Hospitals and Clinics Authority, reported that it experienced a cyber-attack that affected the protected health information (PHI) of 4,563 individuals. The PHI included names, dates of birth, addresses, claims information, diagnoses/conditions, lab results, and medications. The CE notified HHS, the affected individuals, and the media. The CE implemented new policies and security awareness training as well as additional administrative, technical, and security safeguards.

What is known

People affected4,563 (as reported to HHS)
DisclosedJun 18, 2021
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

Other breaches at University of Wisconsin Hospitals and Clinics Authority

History of this record
Added2026-09-25
First recordedby backfillSource

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

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