Clustered 5 filings across 4 jurisdictions · filed Jun 27, 2025. View entity profile → Other incidents for this victim →
incident inc_dce6f20e11cc461b · merge_method deterministic · confidence 100%
Discovered → first regulatory filing
Range of discovered_at dates across filings
Time between earliest and latest filing
Not recorded for this incident
Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.
Identity (basic)
IN ME NH SC
HHS OCR · State AG
per-filing reported counts
State AGs report only their own residents; bars show per-filing counts.
Earliest sighting first · deep chronology in Litigation Timeline
Dec 25, 2024
When the intrusion reportedly occurred, per the linked filings
Dec 27, 2024
Reported by SOUTH CAROLINA AG, NEW HAMPSHIRE AG filings
May 20, 2025
Reported by MAINE AG filing
Horizon Healthcare RCM reported to HHS on 06/27/2025 a Hacking/IT Incident affecting 210901 individuals. Breached information located on Network Server.
Affected (this filing): 210,901
About this clustering
DisclosureLens links filings into incidents through layered matchers: deterministic rules (same source document, multistate filings of one breach, tight-window same-victim pairs), a weighted-similarity scorer for cross-source candidates, and an operator review queue for everything uncertain. Each link records its own method and confidence — shown per filing in the timeline below. The system defaults to NOT merging when uncertain, because a false merge (collapsing two unrelated breaches) is more harmful than a false split (showing related filings separately); uncertain pairs route to human review instead of auto-merging. Filing summaries shown in the timeline are AI-generated extracts — verify each against its linked source.
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.
Affected (this filing): 77,410
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.
Affected (this filing): 14
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.
Affected (this filing): 6