John Muir Health - Walnut Creek Medical Center
Disclosed Apr 13, 2023821 affectedConfirmed
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.
What is known
| People affected | 821 (as reported to HHS) |
|---|---|
| Disclosed | Apr 13, 2023 |
| Happened | Jul 1, 2021 |
| Attack | Insider |
| Data exposed | NamesHealth |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
Notices filed
History of this record
First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.
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