HackingHealthcareHealthcareStolen CredentialsSupply Chain (3P Vendor)Business Associate (HIPAA)Customer Data InvolvedDelayed DiscoveryPHIIdentity (basic)Government IDHealth (basic)MediumContained

One Community Health

bd_1fdb110cd32f7840 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Oct 2, 2025

Filed

Jan 8, 2026

To disclose

14 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

64%

Full breach record for One Community Health →2 incidents on file

One Community Health notified patients of a security incident involving its third-party clearinghouse, TriZetto Provider Solutions. An unauthorized individual accessed historical eligibility transaction reports containing PHI (including SSNs and health insurance info) between November 2024 and October 2, 2025. TriZetto discovered the activity on October 2, 2025, engaged Mandiant, and contained the threat. No payment card data was involved. Credit monitoring is being offered.

J jump to incidentP pin to compareR raw source

California clockDiscovered Oct 2, 2025 → Notified Dec 23, 202582d ✗ CA 60-day late14 weeks discovery → filing

Incident timeline

undetected · 335 days

discovery → filing · 14 weeks / 98 days

Nov 1, 2024

Begins

Oct 2, 2025

Discovered

Jan 8, 2026

Filed

vs. sector median

+1 wks slower

This filing is one of 2 about the same incident.View merged incident

Part of TriZetto Provider Solutions supply-chain incident (2025) — a supply-chain cascade affecting multiple organizations.View cascade →

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

HHS OCRbd_7d4507ef99b769052026-01-02 · +6dCandidate

Name: One Community Health
norm: one community health

Name: One Community Health
norm: one community health
Industry: Healthcarellm

Discovered: Oct 2, 2025
Breach occurred: Nov 1, 2024 – Oct 2, 2025
Undetected for: 335 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 23, 2025
Affected individuals: Not disclosed
Data types: PHIIdentity (basic)Government IDHealth (basic)
Data elements: Social Security numberDate of birth
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Third party: via TriZetto Provider Solutions
Initial access: trusted_relationship

During the incident: Immediately launched an investigation and engaged external cybersecurity experts (Mandiant)
Took steps to eliminate the threat and secure their systems
Notified law enforcement
Offering complimentary credit monitoring, fraud consultation, and identity theft restoration services through Kroll
Changes made: Committed to continuing to strengthen the security of their systems and applications
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(98 days from discovery to filing)
Compliance flags: CA 60-day late · 82d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Oct 2, 2025
→ Notified: Dec 23, 2025
82d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Oct 2, 2025 → Notified: Dec 23, 2025	82d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings

View merged incident ↗

HHS OCRJan 2 · first

California State AG+6d · this page

Pattern: first filing Jan 2 (CA), last Jan 8 (CA) — a 6-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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://oag.ca.gov/ecrime/databreach/reports/sb24-616701
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 8, 2026
Raw hash: 8673a4b145c184b25edac40f709c3570542fb63ca6e7f379c6c94bcdf7c2b6cb

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityOne Community Health

Victim entityOne Community Health

Incidentdiscovered Oct 2, 2025

Stated responseImmediately launched an investigation and engaged external cybersecurity experts (Mandiant)

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov