Apportionment

A calculation distributing fault, blame or causation among multiple factors that may have caused or contributed to an injury disease or existing problem, such as when someone has two motor vehicle accidents, both causing injury. Another example requiring apportionment would be a patient with an open treatment plan for a motor vehicle accident injury, who then becomes injured in a totally unrelated accident at work.  Often becomes an issue when calculating multiple insurance reimbursements for the same or similar treatment.