Many residents or cross-border commuters have already asked themselves whether they are best off seeking medical care in Luxembourg or abroad. While the National Health Fund, the Caisse Nationale de Santé or CNS, plays a central role in reimbursing healthcare costs, it is worth remembering that supplementary health insurance can offer additional cover and benefits. As well as covering expenses not reimbursed by the CNS, you can also, subject to prior agreement, pick the hospital or clinic in Europe where you wish to be treated. This article explores the options available and the formalities surrounding medical care in Luxembourg or abroad.