The Belgian health insurance system reimburses (Belgian) medical expenses. On average, the health insurance system will reimburse 75% of your expenses. How much is reimbursed mainly depends on the nature of the service provided and on the status of both the insured person and the care provider.
In most cases the full amount will not be reimbursed. You will often be required to pay a personal contribution, the so-called 'remgeld' or patient contribution. In principle, the personal contribution amounts to 25% of the expense but this may be higher depending on the type of care provided. Some (essential) medical expenses are reimbursed in full.
Expenses are reimbursed after the fact by the legal health insurance providers on the basis of your receipt or 'getuigschrift van verstrekte hulp'. Attach an identification sticker (which you get when you register with a health insurance provider) to the receipt and take it or send it to your health insurance provider. In case of emergency, you can also go to A&E at the hospital. However, you should only do this if it is really necessary. At weekends and out of office hours, you can see a duty doctor.