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Regulator-posted notice

Breach notice filed by John Muir Health - Walnut Creek Medical Center (April 2023)

Organization named: John Muir Health - Walnut Creek Medical Center Provisional: identity as filed, not yet matched to the directory
Type as the source lists it: Unauthorized Access/Disclosure

What the sources say

HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals) Primary notice

Posted on the HHS Office for Civil Rights breach portal with a submission date of April 13, 2023.

Organization as reported
John Muir Health - Walnut Creek Medical Center, CA
Entity type as reported
Healthcare Provider
Category as reported
Unauthorized Access/Disclosure
Location of information as reported
Network Server
Submission date
April 13, 2023
Observed by BreachRecords
2026-10-18 16:15 UTC (revision 10793, row:1932)
Archived copy
Held in the private archive (provenance)

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.

The source's own words, from the revision above.

Figures, per source

  • 821 individuals affected (total reported), according to the HHS Office for Civil Rights breach portal, source date April 13, 2023, revision observed 2026-10-18.

Each figure is one source's figure with the basis that source gave. Figures from different sources are shown side by side and are not added, averaged or chosen between.

Timeline

Source dates are the dates the sources give. Observation dates are when BreachRecords recorded each revision.

  • Submission date (HHS Office for Civil Rights breach portal)
  • Observed by BreachRecords (revision 10793)
  • Approved by a reviewer

Organizations linked by a reviewer

Archived evidence

  • 3dbc27dd5742e041cc1e7fe18cc669e2901fbd3b86b7007ed27948ff4d406e1f
    text/csv, 5,530,996 bytes, retrieved from HHS Office for Civil Rights breach portal, 2026-10-18 16:15 UTC. Archived privately · Provenance · Source page

Records reflect source filings as of the dates shown. BreachRecords is not a regulator.

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