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The Law of Custom and Usage Evidence in Insurance and Reinsurance Contracts

By John M. Nonna and Marc L. Abrams
December 01, 2005

Reinsurance and insurance contracts would be thousands of pages long if they explicitly defined every possible term, however mundane, or if they anticipated every possible contingency, however remote. Fortunately, (or perhaps unfortunately) for the drafters of these contracts, the U.S. legal system typically employs a more streamlined model. That is, parties commit to an agreement with the understanding that courts and other adjudicatory bodies may play a role in filling in contractual “gaps” and giving meaning to indefinite or indeterminate contractual terms. Cf. Phelps Dodge Corp. v. Schumacher Elec. Corp., 2005 U.S. App. LEXIS 14318 (7th Cir. 2005). Although there are a number of methods by which a court can interpret a contract, the importation of custom and usage evidence plays a special role in illuminating insurance and reinsurance contracts. This article explores whether and when courts will admit such evidence, and it divides into three sections: First, the article explains the rules that courts will employ when they determine whether and when to admit custom and usage evidence; second, it considers the effect of integration clauses on the possible importation of custom and usage evidence; and, third, it provides several practical suggestions for a party seeking to import custom and usage evidence.

Admissibility of Custom and Usage Evidence ' The General Rule

In this article, the phrase “custom and usage” refers to any industry usage, custom or practice that has “such regularity of observance” that it justifies an expectation that it will be observed in the transaction at issue. See, e.g., U.C.C. '1-205(2); William Hoffman, On the Use and Abuse of Custom and Usage in Reinsurance Contracts, 33 Tort & Ins. L.J. 1 (1997) [hereinafter Hoffman] (providing a detailed discussion as to the difference between “custom,” “usage” and “practice”). Generally speaking, there are two views on when custom and usage evidence is admissible to interpret an insurance or reinsurance contract. A minority of states will apply the parol evidence rule ' ie, the rule establishing a writing as the exclusive expression of an agreement ' to bar the admission of custom and usage evidence when the contract is unambiguous. See 12 Williston on Contracts '34:7 (Richard A. Lord, 4th ed. 2004). Under this “restrictive” rule ' which was promoted by Williston and incorporated into the First Restatement of Contracts ' a court must, at the outset, make a determination as to whether the contract is ambiguous “on its four corners.” If the contract is unambiguous, the court's inquiry is over, and it must apply the terms of the contract regardless of the custom and usage evidence. On the other hand, if the contract is ambiguous then the court may consider extrinsic evidence including custom and usage evidence to ascertain the intent of the contracting parties. Carey Canada, Inc. v. Columbia Cas. Co., 940 F.2d 1548, 1555-56 (D.C. Cir. 1991); Employers Reinsurance Corp. v. Mid-Continent Cas. Co., 358 F.3d 757, 764 (10th Cir. 2004); Young v. Liberty Mut. Ins. Co., 1999 U.S. Dist. LEXIS 6987 (D. Conn. 1999); Morgan Stanley Group v. New England Ins. Co., 7 F. Supp. 2d 297, 301-02 (S.D.N.Y. 1998).

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