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⚖️ '''Extrinsic evidence''' refers to information outside the four corners of an [[Definition:Insurance policy | insurance policy]] — such as correspondence, negotiation records, industry custom, or agent representations — that a court may consider when interpreting ambiguous policy language. In insurance [[Definition:Coverage dispute | coverage disputes]], the threshold question is often whether the contract's terms are clear on their face; only when a judge finds genuine ambiguity does extrinsic evidence typically become admissible. Because insurance contracts are [[Definition:Contract of adhesion | contracts of adhesion]] drafted by the insurer, courts in many jurisdictions apply the [[Definition:Contra proferentem | contra proferentem]] doctrine alongside extrinsic evidence to resolve lingering uncertainties in favor of the [[Definition:Policyholder | policyholder]].

🔍 The admissibility and weight of extrinsic evidence vary significantly by jurisdiction. Some states follow a "plain meaning" rule that bars outside evidence when the policy text appears unambiguous, while others — notably California — permit extrinsic evidence at the outset to determine whether an ambiguity even exists. In practice, an [[Definition:Insurance carrier | insurer]] defending a [[Definition:Claim denial | claim denial]] might introduce underwriting files or application questionnaires to show the parties' mutual intent, while the claimant might present marketing materials or [[Definition:Insurance agent | agent]] statements suggesting broader coverage. These evidentiary battles frequently arise in [[Definition:Commercial general liability (CGL) | commercial general liability]] and [[Definition:Errors and omissions insurance (E&O) | errors and omissions]] cases, where policy wording can be notoriously nuanced.

📌 For insurers and [[Definition:Managing general agent (MGA) | MGAs]], the practical takeaway is that sloppy or inconsistent documentation can become ammunition in litigation. Underwriting notes, binder language, and policyholder communications all represent potential extrinsic evidence if a dispute reaches court. This reality underscores the importance of clear policy drafting, disciplined file documentation, and thorough [[Definition:Claims handling | claims handling]] procedures — because what exists outside the policy may ultimately determine what the policy means.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Contra proferentem]]
* [[Definition:Contract of adhesion]]
* [[Definition:Policy interpretation]]
* [[Definition:Coverage dispute]]
* [[Definition:Parol evidence rule]]
* [[Definition:Duty to defend]]
{{Div col end}}

Definition:Extrinsic evidence - Revision history

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