CALIFORNIAMalwareHealthcareHealthcareRansomwareBusiness Associate (HIPAA)Customer Data InvolvedData ExfiltratedData EncryptedRansom DemandedPHIHealth (basic)Identity (basic)MediumContained

Health Plan of San Mateo

bd_4e8c44d85a09d692 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Jan 18, 2023

To disclose

—

Affected

4,032

Confidence

68%

Full breach record for Health Plan of San Mateo →3 incidents on file

Health Plan of San Mateo reported to HHS on 2023-01-18 a Hacking/IT Incident affecting 4,032 individuals. A subcontractor of its business associate experienced a ransomware incident. Breached information located on Network Server. PHI included names, DOB, insurance info, diagnoses, and health assessments.

J jump to incidentP pin to compareR raw source

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

Jan 18, 2023

Filed

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

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed4,032 affectedView incident

Name: Health Plan of San Mateo
norm: health plan of san mateo
Industry: Insurance — Health

Name: Health Plan of San Mateo
norm: health plan of san mateo
Industry: Healthcaresource default

Discovered: Not extracted — the OCR public portal omits it
Materiality determined: —
Notification sent: —
Affected individuals: 4,032nationwide
Data types: PHIHealth (basic)Identity (basic)
HHS breach type: Hacking / IT incident
Where the data lived: Network server
Covered-entity type: Health planBusiness associate involved
Attack vector: Unauthorized Access
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified HHS

During the incident: Notified HHS
Notified affected individuals
Notified the media
Posted substitute notice on its website
Implemented additional administrative, technical, and security safeguards
Retrained its employees
Changes made: Implemented additional administrative, technical, and security safeguards
Retrained its employees
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: Jan 18, 2023
Raw hash: 33e31423754a023249efcc7c5355a49135ce5b1626b9d6c7704ff762882764da

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.

text/html1.5 KB

Download View at source

Reporting entityHealth Plan of San Mateo

Victim entityHealth Plan of San Mateo

IncidentUnauthorized Access

Stated responseNotified HHS

ComplianceHHS notified

Extraction provenanceno artifact recorded

Source provenanceocrportal.hhs.gov

Source filing