One linked filing — more sources may join as they report · filed Jun 25, 2021. View entity profile → Other incidents for this victim →
incident inc_12c0a9bd7a88486e · merge_method deterministic
Not recorded for this incident
Discovery variance · Leak precedence · Materiality delta · SEC filing delay · Filing span — no leak-site claim in this cluster; no SEC 8-K in this cluster; needs two dated filings.
PHI · Health (basic) · Identity (basic)
IL
all HHS OCR
Earliest sighting first · deep chronology in Litigation Timeline
Northwestern Memorial HealthCare reported to HHS on 2021-06-25 a Hacking/IT Incident affecting 201,197 individuals. Breached information located on Network Server. The breach involved a business associate and exposed PHI including names, SSNs, and diagnoses. The entity provided credit monitoring and terminated the business relationship.
Affected (this filing): 201,197
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.