HHS OCR report ยท 2021
DuPage Medical Group, Ltd. data breach
OCR report facts
- Covered entity
- DuPage Medical Group, Ltd.
- Entity type
- Healthcare Provider
- State
- Illinois
- Individuals affected
- 655,384
- Submission date
- Aug 30, 2021
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
The covered entity (CE), DuPage Medical Group, reported that it was the subject of a cyber-attack that affected the protected health information (PHI) of 655,384 individuals. The PHI involved included names, addresses, dates of birth, Social Security numbers, diagnoses, and other treatment information. The CE notified HHS, the affected individuals, the media, and provided substitute notice. In response to the breach, the CE provided complimentary credit monitoring services and implemented add...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the DuPage Medical Group, Ltd. data breach?
The report to HHS OCR lists 655,384 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Aug 30, 2021.
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 DuPage Medical Group, Ltd. 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 DuPage Medical Group, Ltd..