Mono County
Disclosed Sep 25, 20206 years ago2,850 affectedConfirmed
The covered entity (CE), Mono County, reported that it experienced a cyber-attack that affected the electronic protected health information (ePHI) of 2,850 individuals. The ePHI (ePHI) involved included names, dates of birth, lab results, and other treatment information. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. As a result of OCR’s investigation, the CE implemented additional technical safeguards and retrained its staff.
What is known
| People affected | 2,850 (as reported to HHS) |
|---|---|
| Disclosed | Sep 25, 2020 |
| Happened | Apr 9, 2020 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Government · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Mono Countyoag.ca.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Mono County (Healthcare Provider, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| California AGresidents of CA | Sep 25, 2020 | |
| HHS archivetotal | Sep 25, 2020 | 2,850 |
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: empty to hhs · backfill source
- 2026-09-25 · records: empty to 2850 · backfill source
- 2026-09-25 · summary: empty to The covered entity (CE), Mono County, reported that it experienced a cyber-attack that affected the electronic protected health information (ePHI) of 2,850 individuals. The ePHI (ePHI) involved included names, dates of birth, lab results, a · 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.