DisclosureLens
ILLINOISMalwareHealthcareHealthcareRansomwareBusiness Associate (HIPAA)Customer Data InvolvedData EncryptedData ExfiltratedRansom DemandedHealth (basic)Identity (basic)Government IDCriticalResolved

Cook County Health

bd_2fb1e8ae3723791a · schema v1 · pii pii-v1

Severity

Critical

Discovered

—

Filed

Sep 24, 2023

To disclose

—

Affected

1,248,546

Confidence

97%
Full breach record for Cook County Health →10 incidents on file

Cook County Health and Hospitals System (IL) reported to HHS OCR on 2023-09-24 that its business associate experienced a ransomware attack affecting 1,248,546 individuals. PHI on network servers was compromised, including names, addresses, dates of birth, Social Security numbers, diagnoses, and other treatment information. The CE notified HHS, affected individuals, and the media, and terminated its business relationship with the responsible BA.

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

Sep 24, 2023

Filed

—

No filing yet · watching

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1,248,546 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.