HHS OCR report ยท 2023
Petaluma Health Center data breach
OCR report facts
- Covered entity
- Petaluma Health Center
- Entity type
- Healthcare Provider
- State
- California
- Individuals affected
- 124,862
- Submission date
- Jun 2, 2023
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
The covered entity (CE), Petaluma Health Center, reported that it experienced a ransomware attack that compromised the protected health information (PHI) of 124,862 individuals. The PHI involved included names, dates of birth, addresses, Social Security numbers, and treatment and health insurance information. The CE notified HHS, affected individuals, the media, and posted substitute notice to its website. In its mitigation efforts, the CE implemented additional administrative and technical s...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Petaluma Health Center data breach?
The report to HHS OCR lists 124,862 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Jun 2, 2023.
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 Petaluma Health 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 Petaluma Health Center.