What is concurrent causation and how does it affect coverage when multiple perils cause a loss?

• A. If more than one peril causes a loss, coverage depends on the dominant or efficient cause; if the dominant cause is covered, loss may be covered.
• B. If two perils occur, the insurer always pays both.
• C. If a loss is caused by a peril that is excluded, there is never any coverage.
• D. If multiple perils cause a loss, the insurer selects the cheaper remedy.

Answer: (A)

Concurrent causation arises when more than one peril contributes to the same loss. In property insurance, the determination centers on the most significant event that set the chain of events in motion—the proximate or efficient cause. Under this approach, if that dominant cause is a peril the policy covers, the loss can be covered even if another peril also contributed. If the dominant cause is an excluded peril, the loss is not covered, even though a covered peril was involved.

For example, if wind damage (a covered peril) initiates a roof failure and water damage results from the same incident, the claim is covered because wind was the proximate cause. If a flood (an excluded peril) is the primary driver of the loss, coverage would likely be denied—even if wind contributed—because the efficient proximate cause was the excluded peril.

The other statements aren’t accurate because they imply automatic coverage for multiple perils, or blanket denial of coverage when an excluded peril is involved, or a mechanic where the insurer simply picks the cheaper remedy. In reality, the ruling hinges on which cause was the dominant one.