The CNS card: how you get it, one per person, and what to do if you lose it
Issued automatically with your affiliation, one per person, and usable by matricule before it even arrives.
The short version
- The carte CNS is the personal health-insurance card of everyone affiliated to the Caisse nationale de santé. It carries your matricule (13-digit social-security number), your name and a photo.
- You do not apply for it separately: it is issued automatically once your affiliation is registered at the CCSS — by your employer, by your own registration as self-employed, or as a dependant.
- Each person has their own card, including co-affiliated children and spouses.
- It arrives by post within a few weeks; until then your matricule alone is enough at the doctor and the pharmacy.
- Lost or damaged? A replacement is requested from the CNS via MyGuichet.lu, post or phone.
- It is not the European Health Insurance Card — that one is separate and issued on request.
What the CNS card is
The carte CNS (also called the carte de sécurité sociale) is the plastic card that proves you are insured with the Caisse nationale de santé, Luxembourg's single public sickness fund. It shows your name, your photograph and your matricule national — the 13-digit identifier built from your date of birth that follows you through every part of Luxembourg's social-security and tax administration.
Functionally, the card is a carrier for that matricule. Doctors, pharmacies, laboratories and hospitals read it to identify you in the eSanté platform, to apply the correct reimbursement rate and, in hospitals, to trigger third-party-payer billing. It also identifies you for the Dossier de Soins Partagé (DSP), the national shared patient record.
How you get it
There is no separate application form. The card is generated by the CNS as a consequence of your affiliation, which is recorded by the Centre commun de la sécurité sociale (CCSS):
- Employees — the employer files a declaration of hire (déclaration d'entrée) with the CCSS, normally on or before the first day of the contract. Affiliation, the matricule and the card follow from that declaration.
- Self-employed — you register with the CCSS yourself once your business authorisation is in place.
- Dependants — a spouse, registered partner or child without insurable activity of their own is co-affiliated on the principal's affiliation; the principal declares them to the CCSS and each dependant receives their own matricule and card.
- Students, pensioners, jobseekers — affiliation is opened by the relevant institution (university, pension fund, ADEM) and the card follows the same route.
If you already had a Luxembourg matricule from an earlier period — a previous job, a cross-border position, a university enrolment — the same number is reactivated; you do not get a second one.
One card per person
A recurring question from newcomers used to family-level insurance: each insured person has an individual card. A couple with two children receives four cards, each with its own matricule. Co-affiliated dependants have exactly the same rights and reimbursement rates as the principal insured; the card simply records that their cover derives from someone else's affiliation. Keep the children's cards with whoever usually takes them to the paediatrician — the practice will ask for the child's card, not the parent's.
How the card is used
At a doctor's appointment, reception reads the card or notes the matricule; at the end you pay and receive a mémoire d'honoraires that you send to the CNS for reimbursement (the full mechanic is in the CNS reimbursement guide). At the pharmacy, the card lets the pharmacist apply the CNS share on the spot, so you pay only the patient portion. At a hospital, the card is used at admission so the medical part of the stay is billed directly to the CNS.
Complementary insurers (CMCM, DKV, Foyer, La Luxembourgeoise) do not issue a card that replaces the carte CNS; their cover sits on top of the CNS reimbursement and is claimed separately, as explained in the complementary insurance guide.
Before the card arrives
The card is printed and posted after the affiliation is processed, which usually means a wait of a few weeks after the start date. During that period you are already insured — cover is retroactive to the first day of affiliation. Ask your employer for the CCSS affiliation confirmation (or read the matricule off your first payslip) and quote the number at the practice or pharmacy. Reimbursement works on the matricule, not on the physical card.
Lost, stolen or damaged
Request a replacement from the CNS: online through MyGuichet.lu (with a LuxTrust or eID login), by letter to the CNS, or by phone. There is no need to inform your employer. The old card is deactivated and a new one, with the same matricule, is posted to your address. As with the initial wait, providers can treat you on the matricule alone in the meantime. If your name, address or photo changes, the same channel is used to request an updated card.
CNS card vs European Health Insurance Card
The carte CNS and the European Health Insurance Card (EHIC) are two different cards. The carte CNS is the domestic card used inside Luxembourg. The EHIC is issued by the CNS on request (MyGuichet.lu, post or phone) and covers medically necessary care during a temporary stay elsewhere in the EU, the EEA or Switzerland, at the conditions of the local system. It is not a travel-insurance substitute: it does not cover repatriation or private clinics. If you travel regularly, request the EHIC at the same time as you check your card has arrived.
Cross-border workers
Everyone employed in Luxembourg is affiliated to the CNS and receives a carte CNS, whether they live in Luxembourg, France, Belgium or Germany. Cross-border workers additionally register the S1 form with the sickness fund of their country of residence (CPAM, mutualité, Krankenkasse), which gives them treatment at home under local rules while keeping the carte CNS for care in Luxembourg. The cross-border section covers the country-specific steps.
FAQ
Does each person have their own CNS card?
Yes. Every insured person — the principal insured and each co-affiliated dependant, including children — has an individual matricule and receives an individual carte CNS. A family does not share a single card.
How long does the CNS card take to arrive?
The card is issued once the CCSS has processed your affiliation. For employees this is triggered by the employer's declaration of hire; the card then arrives by post, typically within a few weeks. Cover is retroactive to the first day of affiliation, so the wait does not leave you uninsured.
Can I see a doctor before the card arrives?
Yes. Give the practice your matricule (from the CCSS affiliation confirmation or your payslip) and you can be treated and reimbursed in the normal way. The card is a carrier for the matricule, not a precondition for cover.
What do I do if I lose my CNS card?
Request a replacement from the CNS — through MyGuichet.lu, by post or by phone. Until it arrives, providers can process your visits using the matricule alone.
Is the CNS card the same as the European Health Insurance Card?
No. The carte CNS is the domestic card used inside Luxembourg. The European Health Insurance Card (EHIC) is a separate card, issued by the CNS on request, for medically necessary care during temporary stays in other EU/EEA countries and Switzerland.
Do cross-border workers get a CNS card?
Yes. Anyone employed in Luxembourg is affiliated to the CNS and receives a carte CNS, regardless of where they live. Cross-border workers additionally register the S1 form with the sickness fund of their country of residence so they can be treated at home as well.
Sources & last reviewed
- Caisse Nationale de Santé — pages on the carte de sécurité sociale, affiliation, the European Health Insurance Card and MyCNS (cns.public.lu). Reviewed 27 August 2026.
- Centre Commun de la Sécurité Sociale — affiliation of employees, the self-employed, students and co-affiliated dependants (ccss.public.lu). Reviewed 27 August 2026.
- Guichet.lu — procedures for requesting a social-security card and a European Health Insurance Card (guichet.public.lu). Reviewed 27 August 2026.
- Code de la Sécurité Sociale — Livre I (assurance maladie-maternité), consolidated text at Legilux. Reviewed 27 August 2026.