HHS OCR report · 2022
Aon PLC data breach
OCR report facts
- Covered entity
- Aon PLC
- Entity type
- Business Associate
- State
- Illinois
- Individuals affected
- 129,682
- Submission date
- May 26, 2022
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- Yes
- Status
- Archive (closed)
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 ident...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Aon PLC data breach?
The report to HHS OCR lists 129,682 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on May 26, 2022.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Network Server.
Is the investigation still open?
No. The report is in the OCR portal archive, which holds reports where OCR has closed its review.
Is a breach notice letter from Aon PLC legitimate?
This site cannot verify letters. Check the sender against the organisation's official website and the HHS OCR breach portal, and avoid calling numbers or clicking links only listed in an unexpected message. See our guide on what to do after a data breach notice.
Source: HHS OCR Breach Portal, OCR export October 2026. Network USA is not affiliated with HHS or Aon PLC.