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

Mission Neighborhood Health Center

bd_4b85bc48af898dee · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 12, 2025

Filed

Jan 7, 2026

To disclose

26 days

Affected

Not disclosed

Confidence

65%

Full breach record for Mission Neighborhood Health Center →2 incidents on file

Mission Neighborhood Health Center (MNHC) notified patients of a data breach involving protected health information (PHI) due to unauthorized access to systems of TriZetto, a subcontractor of MNHC's business associate OCHIN. The incident occurred in November 2024 but was not discovered until December 2025. Affected data includes names, addresses, dates of birth, potential SSNs, and health insurance information. No payment card data was involved. MNHC is cooperating with OCHIN and TriZetto on mitigation and reporting to regulators.

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California clockDiscovered Dec 12, 2025 → Notified Dec 31, 202519d ✓ CA 60-day OK26 days discovery → filing

Incident timeline

undetected · 406 days

discovery → filing · 26 days

Nov 1, 2024

Begins

Dec 12, 2025

Discovered

Jan 7, 2026

Filed

vs. sector median

6 wks faster

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

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Mission Neighborhood Health Center
norm: mission neighborhood health center
Domain: mnhc.org

Name: Mission Neighborhood Health Center
norm: mission neighborhood health center
Domain: mnhc.org
Industry: Healthcarellm

Discovered: Dec 12, 2025
Breach occurred: Nov 1, 2024 – Nov 30, 2024
Undetected for: 406 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 31, 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
Regulator citations: Will report this incident to the California Department of Public HealthWill report this incident to U.S. Department of Health and Human ServicesWill report this incident to California Attorney General’s Office
Third party: via TriZetto
Initial access: supply_chain

During the incident: Worked with OCHIN and TriZetto to investigate the incident and confirm mitigation
Verified that corrective actions were implemented by TriZetto to secure systems and prevent further unauthorized access
Will report this incident to the California Department of Public Health, U.S. Department of Health and Human Services, California Attorney General’s Office, and your health insurer, in accordance with applicable law
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 26 days(26 days from discovery to filing)
Compliance flags: CA 60-day OK · 19d
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: Dec 12, 2025
→ Notified: Dec 31, 2025
19d 60 days (analyst band, pre-2026 discoveries) CA 60-day OK

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Dec 12, 2025 → Notified: Dec 31, 2025	19d	60 days (analyst band, pre-2026 discoveries)	CA 60-day OK

Status: No extraction artifact recorded for this disclosure.

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/sb24-616679
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 7, 2026
Raw hash: 5947e50e0b516ed4c3128a34317566c4c964131d6ac9e73798a18af3254052d5

Reporting entityMission Neighborhood Health Center

Victim entityMission Neighborhood Health Center

Incidentdiscovered Dec 12, 2025

Stated responseWorked with OCHIN and TriZetto to investigate the incident and confirm mitigation

ComplianceCA 60-day OK

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov