HHS OCR report · 2016
Marin Healthcare District data breach
OCR report facts
- Covered entity
- Marin Healthcare District
- Entity type
- Healthcare Provider
- State
- California
- Individuals affected
- 2,292
- Submission date
- Sep 27, 2016
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- Yes
- Status
- Archive (closed)
OCR description
Ransomware infected systems operated by the covered entity’s (CE) business associate (BA), Marin Medical Practice Concepts, Inc. A third party forensic firm hired to investigate the incident found no evidence that patients’ personal, financial, or health information was accessed, viewed, or transferred. However, during the restoration process, one of the BA’s backup systems failed, causing the loss of protected health information (PHI) documented by the CE’s physicians during the period fro...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Marin Healthcare District data breach?
The report to HHS OCR lists 2,292 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Sep 27, 2016.
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 Marin Healthcare District 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 Marin Healthcare District.