Claims
Proximate Cause
Definition
Proximate cause is the dominant or efficient cause that sets in motion an unbroken chain of events leading to a loss, without which the loss would not have occurred. In insurance, proximate cause analysis is used to determine whether a covered peril was the primary cause of damage, even when multiple perils or events contribute to the loss. Courts and adjusters apply the proximate cause doctrine to decide if a claim falls within the scope of policy coverage. When two or more perils combine to cause a loss — one covered and one excluded — the outcome depends on the jurisdiction's legal standard (e.g., the 'efficient proximate cause' rule used in California, which favors the predominant cause in the chain).
In Zach’s Words
“Proximate cause is really about answering one question: what actually caused the loss? When you file a claim, the insurance company doesn't just look at what happened — they trace back through the chain of events to find the dominant cause. That's the proximate cause. Here's why it matters: let's say a storm knocks a tree onto your roof, and then rain pours in and ruins your floors. The proximate cause is the windstorm — a covered peril — even though the water did the actual damage inside. But if the loss traces back to something excluded in your policy, like earth movement or neglected maintenance, the claim can be denied even if a covered peril was involved somewhere along the way. In California, we follow what's called the 'efficient proximate cause' rule, which means the predominant cause in the chain is what determines coverage. It's one of the most important — and most debated — concepts in claims.”
— Zach Nadler, CIO