MalwareHealthcareProfessional ServicesHealthcareRansomwareData ExfiltratedData EncryptedCustomer Data InvolvedGovernment IDIdentity (basic)MediumContained

Horizon Healthcare RCM

bd_683236bfcdb2a090 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Dec 27, 2024

Filed

Jun 27, 2025

To disclose

—

Affected

11state residents only

Linked

8 filings

Confidence

66%

Full breach record for Horizon Healthcare RCM →2 incidents on file

Horizon Healthcare RCM disclosed a December 2024 ransomware incident affecting 11 Nebraska residents. A computer virus encrypted files, and data was copied without permission. Affected data included names and Social Security numbers. Horizon notified federal law enforcement, restored systems, and provided 12 months of credit monitoring via Kroll to affected individuals. Notices were sent starting June 27, 2025.

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Incident timeline

undetected · 1 days

Dec 26, 2024

Begins

Dec 27, 2024

Discovered

Jun 27, 2025

Filed

This filing is one of 8 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

HHS OCRbd_2494d37011c4c79c2025-06-27Verified
Indiana State AGbd_25fcf4be90ea13492025-06-27Verified
South Carolina State AGbd_2c30bdb47fb3604a2025-06-27Verified
Massachusetts State AGbd_8ff54dbb0d7f4d762025-06-27Verified

Show 3 more filings ↓up to 4d gap

New Hampshire State AGbd_a3ed180e1ba972d72025-06-27Verified
Maine State AGbd_b9ed9343a285ba772025-06-27Verified
Illinois State AGbd_5a1984ac023e4ba82025-07-01 · +4dVerified

Name: Horizon Healthcare RCM
norm: horizon healthcare rcm

Name: Horizon Healthcare RCM
norm: horizon healthcare rcm
Industry: HealthcarellmProfessional Servicesllm

Discovered: Dec 27, 2024
Breach occurred: Dec 26, 2024 – Dec 27, 2024
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Jun 27, 2025
Affected individuals: 11state-resident count only
Data types: Government IDIdentity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Providing written notice of this incident to relevant state regulators, as necessary

During the incident: Notified Federal law enforcement regarding the event
Implemented additional technological safeguards and training to its employees
Providing access to credit monitoring services for twelve (12) months, through Kroll, to individuals whose personal information was potentially affected by this incident, at no cost to these individuals
Providing written notice of this incident to relevant state regulators, as necessary, and to the three major credit reporting agencies, Equifax, Experian, and TransUnion
Changes made: Arranged for the party responsible for this matter to delete the copied information
Implemented additional technical measures and processes to further enhance the company’s security
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 7 states

View merged incident ↗

HHS OCRJun 27 · first

Indiana State AGJun 27 · first

South Carolina State AGJun 27 · first

Massachusetts State AGJun 27 · first

New Hampshire State AGJun 27 · first

Maine State AGJun 27 · first

Nebraska State AGJun 27 · first · this page

Illinois State AG+4d

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://nebraska.gov/ago/data-breach/documents/6528689b-9d1f-4617-b25e-655281ec1f37.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 27, 2025
Raw hash: 4e6b8b85d6fd1e9692b6630c050de198ead092ae18ec101a7f38db5339410f12

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityHorizon Healthcare RCM

Victim entityHorizon Healthcare RCM

Incidentdiscovered Dec 27, 2024

Stated responseNotified Federal law enforcement regarding the event

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancenebraska.gov