DuPage Medical Group
Disclosed Aug 30, 20215 years ago655,384 affectedConfirmed
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 additional administrative, technical, and security safeguards to better protect its PHI.
What is known
| People affected | 655,384 (as reported to HHS) |
|---|---|
| Disclosed | Aug 30, 2021 |
| Happened | Jul 12, 2021 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: DuPage Medical Groupoag.ca.gov · Official notice | Official notice |
| Indiana Attorney General 2021 data breach report: DuPage Medical Groupin.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): DuPage Medical Group (Healthcare Provider, IL)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| Indiana AGresidents of IN | Aug 30, 2021 | 5 |
| HHS archivetotal | Aug 30, 2021 | 655,384 |
| California AGresidents of CA | Sep 1, 2021 |
History of this record
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · data_types: [] to ["names","health"] · backfill source
- 2026-09-25 · records_basis: organization to hhs · backfill source
- 2026-09-25 · records: 655355 to 655384 · backfill source
- 2026-09-25 · summary: empty to 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, Socia · backfill source
- 2026-09-25 · records_basis: empty to organization · backfill source
- 2026-09-25 · records: empty to 655355 · backfill source
- 2026-09-25 · disclosed: 2021-09-01 to 2021-08-30 · backfill source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.