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🗓️ '''Date of injury''' is the specific calendar date on which a bodily injury, illness, or harmful event is determined to have occurred, serving as a critical trigger point for [[Definition:Coverage | coverage]] determination, [[Definition:Claims management | claims]] handling, and [[Definition:Statute of limitations | statute of limitations]] calculations in insurance. Across [[Definition:Workers' compensation insurance | workers' compensation]], [[Definition:General liability insurance | general liability]], [[Definition:Personal injury protection (PIP) | personal injury protection]], and other [[Definition:Casualty insurance | casualty]] lines, the date of injury establishes which [[Definition:Insurance policy | policy]] period applies, which policy terms govern the [[Definition:Claim | claim]], and when the obligation to report and reserve begins.

⚙️ Pinpointing the date of injury is straightforward for acute events — a workplace fall or an automobile collision — but becomes far more complex for [[Definition:Latent claim | latent]] or cumulative injuries. In [[Definition:Workers' compensation insurance | workers' compensation]], repetitive stress injuries or occupational diseases like mesothelioma may develop over years, forcing [[Definition:Claims adjuster | adjusters]] and courts to apply legal doctrines such as the "last exposure" rule or the "manifestation" rule to assign a date. The chosen date determines which [[Definition:Insurance carrier | carrier]] or policy year bears responsibility, a question with significant financial consequences when multiple insurers have covered the same employer across successive policy periods. Similarly, in [[Definition:General liability insurance | liability]] lines written on an [[Definition:Occurrence-based policy | occurrence basis]], the date of injury anchors the triggering event to a specific [[Definition:Policy period | policy period]], directly affecting whether [[Definition:Reinsurance | reinsurance]] recoveries and [[Definition:Deductible | deductible]] structures apply.

💡 Disputes over the date of injury rank among the most litigated issues in insurance law, particularly in long-tail lines where decades may separate the initial [[Definition:Exposure | exposure]] from the [[Definition:Claim | claim]] filing. Getting it wrong — or failing to establish it clearly — can result in [[Definition:Coverage denial | coverage denials]] that are later overturned, [[Definition:Claims reserve | reserve]] deficiencies that distort financial results, or protracted [[Definition:Allocation | allocation]] battles among successive carriers. Insurers invest in detailed investigation protocols, medical evidence review, and legal expertise to establish this date accurately, because it functions as the keystone connecting the facts of an injury to the contractual and regulatory framework that governs how the [[Definition:Loss | loss]] is ultimately paid.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Occurrence-based policy]]
* [[Definition:Claims-made policy]]
* [[Definition:Workers' compensation insurance]]
* [[Definition:Statute of limitations]]
* [[Definition:Latent claim]]
* [[Definition:Policy period]]
{{Div col end}}

Definition:Date of injury - Revision history

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