University of Michigan
Disclosed Oct 23, 20232 years ago61,033 affectedConfirmed
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 affected | 61,033 (as reported to HHS) |
|---|---|
| Disclosed | Oct 23, 2023 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| HHS OCR breach report (archive, resolved): University of Michigan (Healthcare Provider, MI)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Oct 23, 2023 | 61,033 |
History of this record
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (HHS archive), confirmed by HHS OCR. Record counts are as reported. Not legal advice.