The MEDRUC message is sent from a party providing medical and related administrative services to a funding institution, allowing evaluation of the medical activity and justification for reimbursement.  It can also be sent from a funding institution to another party in order to advise which reimbursements have been made.

The MEDRUC message can carry either initial specifications of used resources and costs, or modifications to specifications given in a previous message.

Typically, the MEDRUC message can be used between a healthcare service provider or an insurance company and another insurance company as well as between an insurance company and a healthcare service provider.