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⚡ '''Concurrent causation''' is a legal doctrine in insurance law holding that when two or more causes contribute to a single loss — and at least one cause is covered under the [[Definition:Insurance policy | policy]] while another is excluded — the loss may still be covered. The doctrine emerged from a series of influential California court decisions in the 1980s and created significant exposure for [[Definition:Insurance carrier | insurers]], particularly in [[Definition:Property insurance | property]] and [[Definition:Homeowners insurance | homeowners]] lines where losses often involve intertwined perils such as a covered [[Definition:Windstorm | windstorm]] and an excluded [[Definition:Flood insurance | flood]]. Because the doctrine tipped the coverage analysis in favor of [[Definition:Policyholder | policyholders]], it prompted a sweeping industry response that reshaped how [[Definition:Exclusion | exclusions]] are drafted.

⚙️ Under concurrent causation analysis, a court examines whether a covered peril was a contributing or efficient proximate cause of the loss, even if an excluded peril was also at work. For example, if earth movement — typically excluded — and negligent construction — potentially covered — together cause a building to collapse, the policyholder could argue that the covered cause triggers indemnity for the entire loss. Insurers countered this exposure by introducing [[Definition:Anti-concurrent causation clause | anti-concurrent causation (ACC)]] clauses, which state that a listed exclusion applies regardless of any other cause or event contributing concurrently or in any sequence to the loss. These ACC provisions are now standard in most commercial and personal property forms issued by [[Definition:Insurance Services Office (ISO) | ISO]] and proprietary programs alike.

📌 The practical significance of concurrent causation extends into [[Definition:Claims handling | claims handling]], [[Definition:Coverage litigation | coverage litigation]], and [[Definition:Policy drafting | policy drafting]] strategy. Jurisdictions differ sharply on whether ACC clauses are enforceable — some courts uphold them as valid contractual provisions, while others view them as impermissibly broad attempts to eliminate coverage that the policyholder reasonably expected. After major catastrophic events like hurricanes, where wind and water damage overlap, concurrent causation disputes can involve enormous sums and generate class-wide litigation. [[Definition:Underwriting | Underwriters]] and product development teams must stay current on the case law in each state where they write business, because a single judicial decision on ACC enforceability can materially alter the [[Definition:Loss reserve | reserve]] picture for an entire book of property risks.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Anti-concurrent causation clause]]
* [[Definition:Proximate cause]]
* [[Definition:Exclusion]]
* [[Definition:Efficient proximate cause]]
* [[Definition:Coverage litigation]]
* [[Definition:Named peril]]
{{Div col end}}

Definition:Concurrent causation - Revision history

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