Damages and Valuation

Damages Doctrines

Collateral Source Rule

Collateral Source Rule

Collateral Source Rule

The collateral source rule is a common law doctrine providing that a defendant's liability is not reduced by benefits the plaintiff received from sources independent of the defendant, such as health insurance, disability benefits, or gratuitous care.

The rationale is that a wrongdoer should not benefit from the plaintiff's foresight in obtaining insurance. In practice the rule affects both what evidence the jury hears and how the judgment is calculated.

Alternative Names:

Collateral Source Doctrine

Why it Matters?

The rule is often the difference between a damages presentation built on billed charges and one built on amounts actually paid, which in medical-heavy cases can change exposure by a large multiple. Defense strategy on medical specials, lien resolution, and settlement valuation all depend on where the venue stands on this issue.

Frequently asked questions

Can the jury hear that a plaintiff's medical bills were paid by insurance?

Why does the billed versus paid distinction matter so much?