HHS OCR report · 2020
Mono County data breach
OCR report facts
- Covered entity
- Mono County
- Entity type
- Healthcare Provider
- State
- California
- Individuals affected
- 2,850
- Submission date
- Sep 25, 2020
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Electronic Medical Record
- Business associate present
- No
- Status
- Archive (closed)
OCR description
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.
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Mono County data breach?
The report to HHS OCR lists 2,850 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Sep 25, 2020.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Electronic Medical Record.
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 Mono County 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 Mono County.