VIRGINIAMalwareHealthcareHealthcareRansomwareData EncryptedCustomer Data InvolvedPHIHealth (basic)Identity (basic)Government IDHighContained

Horizon Behavioral Health

bd_87431939e0eabf12 · schema v1 · pii pii-v1

Severity

High

Discovered

—

Filed

Apr 21, 2025

To disclose

—

Affected

49,303

Linked

5 filings

Confidence

68%

Full breach record for Horizon Behavioral Health →

Horizon Behavioral Health reported to HHS on 2025-04-21 a Hacking/IT Incident affecting 49,303 individuals. Breached information located on Network Server. The incident involved ransomware encrypting PHI including names, DOBs, SSNs, driver's license numbers, diagnoses, medications, and claims information.

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HIPAA clock✓ HHS notified

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

⚠ No discovery dateThe OCR public portal omits the discovery date, so the 60-day notification clock cannot be evaluated from this source — only that the filing was submitted.

Incident timeline — partial

? — ?

Breach window unknown

Apr 21, 2025

Filed

No interval is drawn: no breach start or discovery date is on record for this filing.

This filing is one of 5 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Vermont State AGbd_225fc4e0b0d887932025-04-21Candidate
Nebraska State AGbd_494ebdd5f2841ce42025-04-21Verified
Montana State AGbd_ba25fb5419d6a0062025-04-21Verified
Massachusetts State AGbd_c52606e3518997232025-04-21Verified

Name: Horizon Behavioral Health
norm: horizon behavioral health
Domain: horizonservices.com
Industry: Health Care Services

Name: Horizon Behavioral Health
norm: horizon behavioral health
Industry: Healthcaresource default

Discovered: Not extracted — the OCR public portal omits it
Materiality determined: —
Notification sent: —
Affected individuals: 49,303nationwide
Data types: PHIHealth (basic)Identity (basic)Government ID
HHS breach type: Hacking / IT incident
Where the data lived: Network server
Covered-entity type: Healthcare provider
Attack vector: Unauthorized Access
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: Notified HHS

During the incident: Offered free credit monitoring to affected individuals
Implemented additional administrative, technical, and security safeguards
Notified HHS
Notified affected individuals
Notified the media
Posted substitute notice to its website
Changes made: Implemented additional administrative, technical, and security safeguards
Source: Quoted from the filing itself, not independently verified.

Compliance flags: HHS notified
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
Clock breakdown: Statute Window Elapsed Threshold Status
HIPAA
Discovered: not extracted
→ Notified: not extracted
— regulatory submission HHS notified

Statute	Window	Elapsed	Threshold	Status
HIPAA	Discovered: not extracted → Notified: not extracted	—	regulatory submission	HHS notified

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Vermont State AGApr 21 · first

Nebraska State AGApr 21 · first

Montana State AGApr 21 · first

Massachusetts State AGApr 21 · first

HHS OCRApr 21 · first · this page

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://ocrportal.hhs.gov/ocr/breach/breach_report.jsf
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Apr 21, 2025
Raw hash: ae1158161cc009f1d766b3fcf05eb01ac1eecd456a185cb4a771b584f9d780e3

AI-assisted summary above. The structured extract on this page was generated from the document below. Inspect the source to verify or correct any field.

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Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityHorizon Behavioral Health

Victim entityHorizon Behavioral Health

IncidentUnauthorized Access

Stated responseOffered free credit monitoring to affected individuals

ComplianceHHS notified

Extraction provenanceno artifact recorded

Source provenanceocrportal.hhs.gov

Source filing