Breachesby GlyphCook County Health and Hospitals System
Disclosed Sep 24, 20231,248,546 affectedConfirmed
Cook County Health and Hospitals System, the covered entity (CE), reported that its business associate (BA) experienced a ransomware attack that compromised the protected health information (PHI) of 1,248,546 individuals. The PHI involved included names, addresses, dates of birth, Social Security numbers, diagnoses, and other treatment information. The CE notified HHS, affected individuals, and the media. In response to the breach, the CE terminated its business relationship with the BA.
What is known
| People affected | 1,248,546 (as reported to HHS) |
|---|---|
| Disclosed | Sep 24, 2023 |
| Attack | Hacking |
| Data exposed | NamesHealth |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
Notices filed
Other breaches at Cook County Health and Hospitals System
Insider breachInsider exposed names and health records. Reported to the HHS archive.727 affectedHealthcareUSOct 27, 2017Hacking breachHacking exposed names and health records. Reported to the HHS archive.23K affectedHealthcareUSJan 11, 2014Lost or stolen device breachLost or stolen device exposed names and health records. Reported to the HHS archive.7,081 affectedHealthcareUSAug 20, 2010
History of this record
First recordedby backfillSource
First seen 2026-09-25 (HHS archive), confirmed by HHS OCR. Record counts are as reported. Not legal advice.