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📜 '''Parol evidence rule''' is a legal doctrine that restricts the ability of parties to an [[Definition:Insurance contract | insurance contract]] to introduce extrinsic evidence — oral statements, prior negotiations, or earlier drafts — to contradict or modify the terms of a fully integrated written [[Definition:Policy | policy]]. In insurance disputes, the rule frequently determines whether a [[Definition:Policyholder | policyholder]] or [[Definition:Insurer | insurer]] can rely on pre-contractual representations made by an [[Definition:Insurance agent | agent]] or [[Definition:Broker | broker]] that differ from what the final policy document states. Because insurance policies are complex, heavily negotiated documents — especially in [[Definition:Commercial insurance | commercial]] and [[Definition:Specialty insurance | specialty]] lines — the parol evidence rule serves as a gatekeeper for what courts will consider when interpreting coverage.

🔎 Courts apply the rule by first asking whether the written policy is "fully integrated," meaning the parties intended it to be the complete and final expression of their agreement. If so, extrinsic evidence that contradicts or adds to the policy terms is generally excluded. However, exceptions abound: evidence may be admitted to show [[Definition:Fraud | fraud]], [[Definition:Misrepresentation | misrepresentation]], mutual mistake, or [[Definition:Ambiguity | ambiguity]] in the contract language. In the insurance world, the [[Definition:Contra proferentem | contra proferentem]] doctrine — which construes ambiguous terms against the drafter, typically the insurer — often interacts with the parol evidence rule, because if a term is deemed ambiguous, the door opens for extrinsic evidence about what the parties actually intended. [[Definition:Underwriter | Underwriters]] and [[Definition:Claims adjuster | claims adjusters]] must therefore ensure that policy language is precise, since vague wording can undermine the very protections the rule is meant to provide.

⚠️ For insurance professionals, the practical takeaway is that the written policy governs — but only when it is clear, complete, and unambiguous. Sloppy drafting, inconsistent [[Definition:Endorsement | endorsements]], or informal side agreements can erode the rule's protective effect, leaving insurers vulnerable to costly [[Definition:Coverage dispute | coverage disputes]]. This is particularly relevant in [[Definition:Surplus lines insurance | surplus lines]] and [[Definition:Lloyd's | Lloyd's]] markets, where bespoke wordings are common and the risk of gaps between negotiated intent and documented terms is heightened. Investing in disciplined policy drafting and thorough documentation of the [[Definition:Underwriting process | underwriting process]] remains the most effective defense against parol evidence challenges.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Insurance contract]]
* [[Definition:Contra proferentem]]
* [[Definition:Policy interpretation]]
* [[Definition:Misrepresentation]]
* [[Definition:Endorsement]]
* [[Definition:Utmost good faith]]
{{Div col end}}

Definition:Parol evidence rule - Revision history

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