Horizon Healthcare RCM

Horizon Healthcare RCM notified Vermont AG of a ransomware incident occurring Dec 26-27, 2024. Files were encrypted and copied. Data included names and government IDs. Horizon restored systems, had attacker delete data, and offers Kroll identity monitoring. No specific count disclosed.

Horizon Healthcare RCM reported a data breach affecting 11 Maine residents. The breach, described as an external system hacking incident, occurred on December 27, 2024, and was discovered on October 30, 2025. Affected individuals were notified on November 26, 2025, and offered 12 months of credit monitoring services through Kroll.

Horizon Healthcare RCM reported a data breach to the Montana Attorney General. The breach was reported on 2025-11-26. The breach occurred from 12/26/2024 to 12/27/2024. 8 Montana residents were affected.

Horizon Healthcare RCM, a revenue-cycle management provider, issued a supplemental data breach notice to the New Hampshire Attorney General on November 26, 2025. The incident involved a computer virus (ransomware) that encrypted files and resulted in unauthorized copying of patient data between December 26-27, 2024. Approximately 10 New Hampshire residents were affected. The breach involved names and other personal information. Horizon engaged Kroll for identity monitoring and implemented enhanced security measures.

Horizon Healthcare RCM reported to HHS on 06/27/2025 a Hacking/IT Incident affecting 210901 individuals. Breached information located on Network Server.

Horizon Healthcare RCM reported a data breach to the Indiana Attorney General. The breach occurred on 2024-12-25 and was reported on 2025-06-27. 47,404 Indiana residents were affected. 77,410 individuals affected in total.

Horizon Healthcare RCM, a former revenue-cycle management company, issued a supplemental notice regarding a December 2024 ransomware incident. A computer virus encrypted files and data was copied between Dec 26-27, 2024. The incident affected patient information (names and other data elements) of individuals who received services from a former Horizon customer. Horizon restored systems, arranged for data deletion by the attacker, and provided complimentary Kroll identity monitoring.

Horizon Healthcare RCM notified the NH AG of a ransomware incident on Dec 27, 2024. Attackers encrypted files and copied data containing names and SSNs of ~14 NH residents between Dec 26-27, 2024. Horizon restored systems, engaged law enforcement, and provided 12 months of credit monitoring.

Horizon Healthcare RCM, a healthcare company, reported an internal system breach that occurred on December 27, 2024, and was discovered on May 20, 2025. The incident affected 6 residents of Maine. Affected individuals were notified on June 27, 2025, and offered 12 months of credit monitoring services through Kroll.