Collateral source rule

The Collateral source rule, or collateral source doctrine, is a rule of evidence that prohibits the admission at trial of evidence that a victim's damages were compensated from some other source of compensation. For example, in a personal injury action, evidence that the Plaintiff's medical bills were paid by medical insurance is not admissible.
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A rule of tort law which holds that the tortfeasor is not allowed to deduct from the amount he or she would be held to pay to the victim of the tort, any goods, services or money received by that victim from other 'collateral' sources as a result of the tort (eg. insurance benefits). - (read more on Collateral source rule)