Sierra Management Group
Disclosed Jun 7, 20263 months ago1,279 affectedConfirmed
What is known
| People affected | 1,279 (as reported to HHS) |
|---|---|
| Disclosed | Jun 7, 2026 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Sierra Management Groupoag.ca.gov · Official notice | Official notice |
| HHS OCR breach report: Sierra Management Group (Business Associate, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS OCRtotal | Jun 7 | 1,279 |
| California AGresidents of CA | Jun 29 |
History of this record
- 2026-09-25 · sector: other to health · backfill source
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · data_types: [] to ["names","health"] · backfill source
- 2026-09-25 · records_basis: empty to hhs · backfill source
- 2026-09-25 · records: empty to 1279 · backfill source
- 2026-09-25 · disclosed: 2026-06-29 to 2026-06-07 · 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.