Horizon Healthcare RCM Reports Ransomware Breach Impacting Patient Data

Horizon Healthcare RCM has confirmed it was the target of a ransomware attack involving the theft of sensitive health information, making it the latest revenue cycle management (RCM) vendor to report such a breach. Based on the company’s breach disclosure, it appears a ransom may have been paid to prevent the public release of stolen data. 

In a report filed with Maine’s Attorney General on June 27, Horizon disclosed that six state residents were impacted but did not provide a total number of affected individuals. As of Monday, the U.S. Department of Health and Human Services’ Office for Civil Rights had not yet listed the incident on its breach portal, which logs healthcare data breaches affecting 500 or more people.
 

However, the scope of the incident may be broader. It remains unclear whether Horizon is notifying patients directly on behalf of these clients or whether each will report the breach independently. 

In a public notice, Horizon explained that the breach was first detected on December 27, 2024, when ransomware locked access to some files. While systems were later restored, the company determined that certain data had also been copied without permission. 

Horizon noted that it “arranged for the responsible party to delete the copied data,” indicating a likely ransom negotiation. Notices are being sent to affected individuals where po

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