Definition:Intervening cause
⚖️ Intervening cause is a legal and analytical concept in insurance that refers to an event occurring between an original cause and the ultimate loss, which breaks or alters the chain of causation linking the initial peril to the claimed damage. In claims handling and coverage litigation, identifying an intervening cause is critical because it can shift or eliminate an insurer's obligation to pay a claim. For example, if a building suffers minor fire damage but then collapses due to a subsequent, unrelated earthquake before repairs can be made, the earthquake may constitute an intervening cause that changes which policy responds — or whether coverage applies at all.
🔗 The analysis typically unfolds during the claims adjustment process or in litigation when a dispute arises over which peril actually caused the loss. Adjusters and legal teams examine whether the intervening event was foreseeable, whether it was independent of the original cause, and whether it was sufficient on its own to produce the loss. In jurisdictions following proximate cause doctrine — a foundational principle in insurance law across common-law systems such as the United States, the United Kingdom, and Australia — the question is whether the intervening cause supersedes the original peril as the dominant, effective cause of loss. Civil-law jurisdictions in Continental Europe and parts of Asia may frame the inquiry differently, often through concepts of adequate causation or concurrent causation, but the practical effect is similar: the insurer must determine which event in the chain triggers or defeats coverage under the policy's terms and exclusions.
📌 Getting intervening cause analysis right has direct financial and strategic consequences for insurers. An incorrect determination can lead to wrongful claim denials — exposing the carrier to bad faith liability and regulatory sanctions — or to overpayment on claims where another party or policy should bear the loss. In complex scenarios such as catastrophe losses involving multiple sequential perils (for instance, a hurricane followed by flooding followed by looting), the intervening cause framework helps allocate losses among different lines of business, reinsurance treaties, and even different insurers on a layered program. Courts and arbitration panels worldwide continue to refine how intervening causes interact with policy language, making this a concept that underwriters, claims professionals, and defense counsel must understand deeply.
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