DisclosureLens
MICHIGANMalwareHealthcareHealthcareRansomwareData EncryptedRansom DemandedCustomer Data InvolvedHealth (basic)Identity (basic)Government IDFinancial accountHighContained

Regents of the University of Michigan

bd_091acb121d8fad50 · schema v1 · pii pii-v1

Severity

High

Discovered

—

Filed

Oct 23, 2023

To disclose

—

Affected

61,033

Confidence

50%
Full breach record for Regents of the University of Michigan →

The University of Michigan reported that it experienced a ransomware incident that affected the protected health information (PHI) of 61,033 individuals. The breach was reported to HHS on October 23, 2023. 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 breach occurred on a network server. In response, the University offered free credit monitoring and identity protection services, implemented additional security safeguards, and retrained staff.

HIPAA clock✓ HHS notified
⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
⚠ No discovery dateThe OCR public portal omits the discovery date, so the 60-day notification clock cannot be evaluated from this source — only that the filing was submitted.

Incident timeline — partial

? — ?

Breach window unknown

Oct 23, 2023

Filed

No interval is drawn: no breach start or discovery date is on record for this filing.

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed61,033 affectedView incident

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.