- State
- CA
- Covered entity type
- Healthcare Provider
- Individuals affected
- 821
- Business associate present
- No
- Type of breach
- Unauthorized Access/Disclosure
- Location of breached information
- Network Server
- First seen by InfoSec Signals
- 9/23/2026
- Last seen in OCR export
- 9/23/2026
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 additional administrative, technical, and security safeguards. Staff members were retrained to better protect its PHI.
Change history
- 9/23/2026Added to OCR's archive list
Source: U.S. Department of Health and Human Services, Office for Civil Rights, Breach Portal. Records are reproduced as published; entity names and figures are OCR's.