Four details:
- Guidehouse provides medical billing and collection services for the California health system, according to a July 16 data breach notification letter.
- On Jan. 20, hackers compromised a service used to transfer files with many clients, including the California health system, the news release said. Guidehouse didn’t discover the breach until late March.
- Patients’ exposed information may include names, birthdates, medical information and more.
- Guidehouse launched an investigation and stopped using the compromised third-party service. It has taken time to accurately determine which data has been affected, the notification letter said. It notified the California health system of the breach May 21.
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