- State
- IL
- Covered entity type
- Business Associate
- Individuals affected
- 129,682
- Business associate present
- Yes
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- First seen by InfoSec Signals
- 9/23/2026
- Last seen in OCR export
- 9/23/2026
OCR description
Aon, a business associate (BA) and covered entity (CE), reported that it experienced a ransomware incident that affected the protected health information (PHI) of 129,682 individuals. The PHI involved included names, dates of birth, Social Security numbers, drivers’ license numbers, health insurance information, and other treatment information. The BA/CE notified HHS, affected individuals, and the media. In response to the breach, the BA/CE offered complimentary credit monitoring and identity theft protection services and implemented additional administrative and technical safeguards. Staff were also retrained on protecting and securing PHI.
Change history
- 9/23/2026Added to OCR's archive list
Source: U.S. Department of Health and Human Services, Office for Civil Rights, Breach Portal. Records are reproduced as published; entity names and figures are OCR's.