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⚖️ '''Proximate cause''' is a foundational legal and insurance principle used to determine which peril in a chain of events is the dominant or effective cause of a loss, thereby establishing whether a [[Definition:Claims | claim]] falls within the scope of an [[Definition:Insurance policy | insurance policy]]. Rather than simply identifying the first event or the last event in a sequence, proximate cause analysis looks for the cause that set the chain in motion and without which the loss would not have occurred. This doctrine is essential in [[Definition:Claims adjustment | claims adjustment]] because most real-world losses involve multiple contributing factors, and the policy's coverage depends on correctly attributing the loss to a covered or excluded peril.

🔍 In practice, applying proximate cause requires [[Definition:Claims adjuster | adjusters]] and [[Definition:Underwriter | underwriters]] to dissect the sequence of events leading to a loss and identify the peril that was the efficient, dominant cause. Consider a scenario where a storm damages a roof, allowing rainwater to enter and cause mold growth over subsequent weeks. If the policy covers storm damage but excludes mold, the proximate cause analysis asks whether the storm was the dominant cause of the entire loss — including the mold — or whether the mold resulted from a separate, excluded cause such as the policyholder's failure to mitigate. Different jurisdictions apply competing doctrines: some follow a strict "efficient proximate cause" rule that favors coverage when a covered peril initiates the loss chain, while others allow [[Definition:Anti-concurrent causation clause | anti-concurrent causation clauses]] in policies that exclude losses when any excluded peril contributes, regardless of sequence.

📌 Getting proximate cause right has enormous financial implications for both [[Definition:Insurer | insurers]] and [[Definition:Policyholder | policyholders]]. Disputed causation is one of the most common grounds for [[Definition:Coverage dispute | coverage disputes]] and [[Definition:Insurance litigation | insurance litigation]], particularly in complex losses involving [[Definition:Natural catastrophe | natural catastrophes]], [[Definition:Business interruption insurance | business interruption]], or multi-peril events like the COVID-19 pandemic, where policyholders argued that government shutdown orders — triggered by the virus — constituted covered physical loss. Courts' interpretations of proximate cause directly shape how [[Definition:Policy wording | policy wordings]] are drafted, how [[Definition:Exclusion | exclusions]] are structured, and how reserves are set. For anyone working in [[Definition:Underwriting | underwriting]] or claims, a thorough understanding of proximate cause doctrine is indispensable to making defensible coverage decisions.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Concurrent causation]]
* [[Definition:Anti-concurrent causation clause]]
* [[Definition:Exclusion]]
* [[Definition:Claims adjustment]]
* [[Definition:Policy wording]]
* [[Definition:Coverage dispute]]
{{Div col end}}

Definition:Proximate cause - Revision history

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