- State
- CA
- Covered entity type
- Healthcare Provider
- Individuals affected
- 124,862
- Business associate present
- No
- Type of breach
- Hacking/IT Incident
- 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), 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 safeguards to better protect its PHI. OCR provided technical assistance regarding the HIPAA Rules.
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.