Incremental cost effectiveness ratio (ICER)

The additional cost of an intervention as compared with the comparator, divided by the difference in effect or patient outcome between the interventions, e.g. additional cost per QALY.

Indirect costs

The cost of time lost from work (or leisure) and decreased productivity due to disease, disability, or death. In cost accounting, refers to costs that cannot be attributed to a particular activity but can be allocated across different activities; may be “fixed” regardless of activity intensity (e.g., building maintenance) or “variable” where their magnitude varies with activity (e.g., heating and lighting a building)

Intangible costs

the cost of pain and suffering resulting from a disease, condition, or intervention