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📝 '''Endorsement''' is a written amendment attached to an [[Definition:Insurance policy | insurance policy]] that modifies the original terms, conditions, [[Definition:Coverage limit | limits]], or scope of coverage. Sometimes called a rider or addendum depending on the [[Definition:Line of business | line of business]], an endorsement can add coverage for exposures not included in the base [[Definition:Policy form | policy form]], remove or restrict certain provisions, adjust [[Definition:Deductible | deductibles]], or change named [[Definition:Insured | insureds]] and covered locations.

🔧 Endorsements range from standard, regulator-approved forms — such as the [[Definition:Insurance Services Office (ISO) | ISO]] forms widely used in [[Definition:Commercial insurance | commercial]] lines — to fully [[Definition:Manuscript policy | manuscript]] language drafted for a specific account. An [[Definition:Underwriter | underwriter]] issues an endorsement either at [[Definition:Inception | inception]] when the policy is first bound or mid-term in response to a change in the insured's exposure, a negotiated coverage enhancement, or a [[Definition:Insurance regulator | regulatory]] requirement. Each endorsement becomes part of the policy contract and is read together with the base form; in the event of a conflict, the endorsement's language typically controls, because it represents the most recent expression of the parties' intent.

🎯 Precision in endorsement language is critical, since ambiguity can lead to coverage disputes and [[Definition:Litigation | litigation]]. A poorly worded [[Definition:Exclusion | exclusion]] endorsement may inadvertently narrow coverage the [[Definition:Policyholder | policyholder]] expected to retain, while an overly broad additional-coverage endorsement can expose the [[Definition:Insurance carrier | insurer]] to [[Definition:Loss | losses]] it did not intend to assume. For [[Definition:Insurance broker | brokers]] and [[Definition:Risk manager | risk managers]], reviewing endorsements carefully — and understanding how they interact with the base form and with each other — is a fundamental part of ensuring that the final policy reflects the coverage actually negotiated.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Policy form]]
* [[Definition:Insurance Services Office (ISO)]]
* [[Definition:Exclusion]]
* [[Definition:Manuscript policy]]
* [[Definition:Rider]]
* [[Definition:Coverage part]]
{{Div col end}}

Definition:Endorsement - Revision history

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