16 Hospitals of Prospect Medical Holdings Impacted by Ransomware Attack

September 29, 2023


The 16 hospitals run by Prospect Medical Holdings are still recovering from a ransomware attack announced last Thursday that caused severe outages at facilities in four states. Several of the hospitals were forced to divert ambulances to other healthcare facilities, cancel appointments and close smaller clinics while the parent company dealt with the attack. The incident has drawn national headlines due to how widespread it is, covering healthcare facilities in multiple states.

While the FBI and the U.S. Department of Health and Human Services (HHS) declined to comment on the perpetrators, HHS published a warning to all hospitals on Friday about Rhysida, noting that it was a relatively new ransomware-as-a-service (RaaS) group that emerged in May.

Incident Date

August 3, 2023

Estimated Cost

ambulances diverted, appointments canceled, clinics closed.

Type of Malware

No Malware identified