CALIFORNIAHackingHealthcareHealthcarePHIHealth (basic)Identity (basic)Financial accountMediumContained

Mendocino Community Health Clinic Inc.

bd_9880ce87afe7686e · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Dec 29, 2025

To disclose

—

Affected

3,538

Confidence

69%

Mendocino Community Health Clinic Inc. reported to HHS on 2025-12-29 a Hacking/IT Incident affecting 3538 individuals. Breached information located on Network Server. A subcontractor of the clinic's business associate conducted a cyberattack compromising PHI, including financial and demographic data. The clinic provided credit monitoring and implemented additional safeguards.

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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

Dec 29, 2025

Filed

—

No filing yet · watching

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed3,538 affectedView incident

Name: Mendocino Community Health Clinic Inc.
norm: mendocino community health clinic
Domain: chcchronicles.org
Industry: Health Care Services

Name: Mendocino Community Health Clinic Inc.
norm: mendocino community health clinic
Domain: chcchronicles.org
Industry: Healthcaresource default

Discovered: Not extracted — the OCR public portal omits it
Materiality determined: —
Notification sent: —
Affected individuals: 3,538nationwide
Data types: PHIHealth (basic)Identity (basic)Financial account
HHS breach type: Hacking / IT incident
Where the data lived: Network server
Covered-entity type: Healthcare providerBusiness associate involved
Attack vector: Unauthorized Access
MITRE ATT&CK: T1195 Supply Chain Compromise
Threat actor: External
Regulator citations: notified HHS
Third party: via subcontractor of its business associatebusiness associate

During the incident: Provided complimentary credit monitoring services to the affected individuals
Implemented additional administrative, technical, and security safeguards to better protect PHI
Notified HHS, the affected individuals, and the media
Changes made: Implemented additional administrative, technical, and security safeguards to better protect PHI
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.

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: Dec 29, 2025
Raw hash: fab2f1ac2d465972bfc1abec431a4e8a52f7142fb5d7f937ac0c408660db0bf5

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Reporting entityMendocino Community Health Clinic Inc.

Victim entityMendocino Community Health Clinic Inc.

IncidentUnauthorized Access

Stated responseProvided complimentary credit monitoring services to the affected individuals

ComplianceHHS notified

Extraction provenanceno artifact recorded

Source provenanceocrportal.hhs.gov

Source filing