HHS OCR report ยท 2023
John Muir Health - Walnut Creek Medical Center data breach
OCR report facts
- Covered entity
- John Muir Health - Walnut Creek Medical Center
- Entity type
- Healthcare Provider
- State
- California
- Individuals affected
- 821
- Submission date
- Apr 13, 2023
- Type of breach
- Unauthorized Access/Disclosure
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
The covered entity (CE), John Muir Health - Walnut Creek Medical Center, reported that a workforce member posted a link to protected health information (PHI) on a publicly accessible website. This breach affected the PHI of 821 individuals. The PHI involved included names, diagnoses, and other treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice. In response to the breach, the CE sanctioned the workforce member involved and implemented a...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the John Muir Health - Walnut Creek Medical Center data breach?
The report to HHS OCR lists 821 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Apr 13, 2023.
What type of breach was it?
The OCR portal lists the type of breach as Unauthorized Access/Disclosure, 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 John Muir Health - Walnut Creek Medical Center 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 John Muir Health - Walnut Creek Medical Center.