Since September 1, 2025, French doctors are required to use new templates for sick leave certificates. These are electronic, but a new secure paper form is also available. Cross-border workers, your general practitioner may be based in France and can issue your sick leave. Here are the procedures depending on the country where you work, but be careful: the old form must no longer be used, even if you work abroad!
If you work in Luxembourg (CNS)
You must submit the new secured Cerfa form (paper version) directly to the CNS within 3 working days (online or by post). The CNS now only accepts the new secured Cerfa forms for processing sick leave certificates issued in France.
Address:
Caisse Nationale de Santé – Indemnités pécuniaires
L-2980 Luxembourg
Or online form: Declaration of incapacity for work – CNS – Luxembourg
The old Cerfa form has been refused since September 1, 2025.
For more information, the CNS has made a dedicated page available: Sick Leave in France: New Mandatory Paper Forms – CNS – Luxembourg
If you work in Germany (Krankenkasse)
You must also use the new paper Cerfa form. You can find our dedicated page detailing the steps to follow (and the deadlines to comply with) in case of illness: Démarches incapacité de travail frontaliers France Allemagne
If you work in Belgium (mutuality)
Send the new secured Cerfa paper form to your Belgian health insurance fund (mutualité) and to your employer. All the information and deadlines you need to know can be found on our dedicated page: Démarches auprès de l’employeur – Frontaliers Grand Est
If you work in Switzerland (loss of earnings insurance or health insurance fund)
Send the secured Cerfa paper form directly to your employer and to the organization that pays the allowance (loss of earnings insurance / health insurance fund). All legal details on the procedures can be found here: Arrêt maladie en Suisse – Frontaliers Grand Est
Further information can be found on the website of our partner Frontaliers Grand Est
