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Sonoma Valley Hospital

Notice to Hospital Patients About Computer Systems Disruption


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Updated 11.13.2020

Sonoma Valley Hospital is committed to the privacy and security of patient information. As we reported recently, Sonoma Valley Hospital experienced a ransomware cyberattack on October 11, 2020 by what we believe is a Russian “threat actor.”  This event was part of a broader attack on dozens of hospitals across the country. We immediately responded by shutting down all systems to contain the damage, which was largely successful in protecting hospital data. We have not paid anything to the threat actor and are cooperating with law enforcement.  

In a ransomware attack, cybercriminals attempt to disrupt the business by locking companies out of their own data and servers. After discovering the attack, our cyber security team – in partnership with outside information technology and forensics experts – successfully prevented the cybercriminal from blocking our system access and ultimately expelled them from our system. Prior to our locking out the cybercriminal, the cybercriminal may have removed a copy of a subset of data.

Based on the reports of the investigation, we believe it was limited to certain patient testing data and do not believe patient or staff financial information was compromised. When the forensic investigation is concluded, we will notify individual patients whose information may have been affected by the breach, and identify the specific information involved. We continue to work with outside experts, including those from UCSF Health, to restore our systems and implement new security procedures that will help protect the hospital in the future.

If you have concerns or questions, you may call our Patient Experience Team at 707.935.5154, Monday through Friday, 9:00 am to 3:30 p.m.  

While we continue to restore full Hospital operations, we have maintained the ability to care for patients using our business continuity plan, and most of our services remain available.

  • Emergency Care remains available 24/7.
  • Necessary surgeries and elective procedures have not been disrupted by the incident and continue.  
  • The majority of diagnostic tests are being continued without interruption.
  • The patient portal remains available but new results have not been posted to the portal since October 11, although we expect it to be updated soon.

If you have questions regarding your particular health needs, please contact your physician or provider.

Emergency: Call 911707.935.5000347 Andrieux Street, Sonoma, CA 95476DirectionsContact