Humana reported a data breach to the Montana Attorney General. The breach was reported on 2019-01-03. The breach occurred from 12/1/2018 to 12/4/2018. 4 Montana residents were affected.
Affected (this filing): 4
Clustered 4 filings across 3 jurisdictions · filing window Jan 3, 2019 → Feb 27, 2019. View entity profile → Other incidents for this victim →
incident inc_73a0e83b93674d5d · merge_method deterministic · confidence 100%
Discovered → first regulatory filing
Time between earliest and latest filing
Not recorded for this incident
Discovery variance · Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster; needs two dated filings.
Identity (basic) · Health (basic)
FEDERAL KY MT
HHS OCR · State AG
Earliest sighting first · deep chronology in Litigation Timeline
Aug 7, 2018
Reported by HHS OCR filing
Dec 1, 2018
When the intrusion reportedly occurred, per the linked filings
Humana reported a data breach to the Montana Attorney General. The breach was reported on 2019-01-03. The breach occurred from 12/1/2018 to 12/4/2018. 4 Montana residents were affected.
Affected (this filing): 4
Humana Inc. reported to HHS on 2019-01-09 an Unauthorized Access/Disclosure affecting 1,211 members. On August 7, 2018, an unauthorized third party used stolen credentials belonging to employees of a business associate (BA) to access the BA's computer network containing PHI. Exposed data included names, dates of birth, insurance policy numbers, and last four SSN digits. The BA contacted the FBI; Humana notified HHS, affected individuals, and the media. Corrective actions were confirmed by OCR. Breached information located on Other system.
Affected (this filing): 1,211
Between Dec 1–3, 2018, attackers conducted a credential stuffing attack against Humana's 'Humana @ Home' mobile app, verifying valid member credentials. Although no PHI was accessible via Humana @ Home, the verified credentials were reused to log into Humana's Go365 app, exposing names, dates of birth, addresses, provider names, dates of service, and types of medical service for 749 individuals (598 Humana members reported to OCR; 151 additional were employees of self-insured employer clients). Humana deactivated the Humana @ Home app and rolled out two-step authentication across its apps and websites. OCR obtained assurances that corrective actions were implemented.
Affected (this filing): 598
The covered entity (CE), Humana, reported that its business associate (BA) experienced a cyber-attack that affected the electronic protected health information (ePHI) of 5,569 individuals. The ePHI involved included names, diagnoses, conditions, health insurance and other treatment information. The CE notified HHS, affected individuals, and the media.
Affected (this filing): 5,569
About this clustering
DisclosureLens links filings into incidents through layered matchers: deterministic rules (same source document, multistate filings of one breach, tight-window same-victim pairs), a weighted-similarity scorer for cross-source candidates, and an operator review queue for everything uncertain. Each link records its own method and confidence — shown per filing in the timeline below. The system defaults to NOT merging when uncertain, because a false merge (collapsing two unrelated breaches) is more harmful than a false split (showing related filings separately); uncertain pairs route to human review instead of auto-merging. Filing summaries shown in the timeline are AI-generated extracts — verify each against its linked source.