MalwareHealthcareProfessional ServicesHealthcareRansomwareCapture Stored DataData ExfiltratedData EncryptedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Horizon Healthcare RCM

bd_a3ed180e1ba972d7 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 27, 2024

Filed

Jun 27, 2025

To disclose

26 weeks

Affected

14state residents only

Linked

8 filings

Confidence

65%

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

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.

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Incident timeline

undetected · 1 days

discovery → filing · 26 weeks / 182 days

Dec 26, 2024

Begins

Dec 27, 2024

Discovered

May 20, 2025

Scope determined

Jun 27, 2025

Filed

vs. sector median

+14 wks slower

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
Nebraska State AGbd_683236bfcdb2a0902025-06-27Verified

Show 3 more filings ↓up to 4d gap

Massachusetts State AGbd_8ff54dbb0d7f4d762025-06-27Verified
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: May 20, 2025
Notification sent: Jun 27, 2025
Affected individuals: 14state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified Federal law enforcement regarding the eventproviding written notice of this incident to relevant state regulators

During the incident: Securely restored its systems
Undertook an intensive review of those files
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
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Providing written notice of this incident to relevant state regulators
Providing written notice... to the three major credit reporting agencies, Equifax, Experian, and TransUnion
Arranged for the party responsible for this matter to delete the copied information
Changes made: Implemented additional technological safeguards and training to its employees
Implemented additional technical measures and processes to further enhance the company’s security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 26 weeks(182 days from discovery to filing)
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

Nebraska State AGJun 27 · first

Massachusetts State AGJun 27 · first

Maine State AGJun 27 · first

New Hampshire 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://mm.nh.gov/files/uploads/doj/remote-docs/horizon-healthcare-rcm-20250627.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: dd2bead6b8eaf52b674b0310547fdf6e39b21896123171a38bc4ba032fc9330e

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityHorizon Healthcare RCM

Victim entityHorizon Healthcare RCM

Incidentdiscovered Dec 27, 2024

Stated responseSecurely restored its systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov