Every public data breach

47 disclosed this week · 26,367 on record

University of Michigan

Disclosed Oct 23, 202361,033 affectedConfirmed

Official notice

The covered entity (CE), The University of Michigan, reported that it experienced a ransomware incident that affected the protected health information (PHI) of 61,033 individuals. The PHI involved included names, addresses, dates of birth, drivers’ license and Social Security numbers, government-issued identification numbers, claims and financial information, diagnoses and conditions, medications, and other treatment information. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. In response to the breach, the CE offered free credit monitoring services and identity protection services and implemented additional administrative, technical, and security safeguards. Staff were also retrained in its requirements to protect and secure PHI.

What is known

People affected61,033 (as reported to HHS)
DisclosedOct 23, 2023
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

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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