Health Insurance for Cross-Border Workers in Luxembourg 2026
Cross-border workers employed in Luxembourg — around 230,000 people, including 126,000 French, 52,000 German and 51,000 Belgian nationals (STATEC data, end of 2024) — are enrolled with the CNS (Caisse Nationale de Santé), which reimburses 88% of medical expenses for adults. To cover the remaining costs and ensure protection in their country of residence, a dedicated cross-border supplementary health insurance is essential: a standard French, Belgian or German health fund does not cover treatment in Luxembourg. Premiums generally range from €60 to €150/month depending on country of residence, personal profile and chosen cover.
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Find the best cover for your situation in just a few clicks — French, Belgian or German cross-border worker.
Compare plans →Cross-border worker status and CNS enrolment in Luxembourg
A cross-border worker is someone who resides in one EU member state and works in another, typically returning home at least once a week. In Luxembourg, cross-border workers account for almost half the workforce — a proportion unmatched anywhere else in Europe.
| Country of residence | Estimated number | Main regions | Key form | Specifics |
|---|---|---|---|---|
🇫🇷 France |
~126,000 | Moselle, Meurthe-et-Moselle, Bas-Rhin, Meuse, Ardennes, Marne, Vosges | S072 (Grand Est) or S1 (other regions) | Dual CNS + CPAM enrolment |
🇧🇪 Belgium |
~51,000 | Province of Luxembourg, Liège | BL1 | CNS top-up to 93.9% for care in Belgium |
🇩🇪 Germany |
~52,000 | Rhineland-Palatinate, Saarland | S1 | Krankenkasse registration mandatory |
Sources: STATEC Luxembourg, CNS — cross-border workers — STATEC data, Q4 2024 (126,256 French, 52,192 German, 51,497 Belgian nationals).
From the very first day of employment in Luxembourg, the employer has 8 days to register the cross-border worker with the CCSS (Centre Commun de la Sécurité Sociale). The worker is then issued a 13-digit identification number and is automatically enrolled with the CNS. This enrolment is compulsory.
Cross-border workers enjoy the same rights as Luxembourg residents when it comes to healthcare in Luxembourg: identical CNS reimbursement rates (88% for adults, 100% for children under 18), equal access to care and the same PID (Immediate Direct Payment) system. The only difference lies in the administrative procedures for accessing care in the country of residence.
The worker’s spouse and children can be co-insured with the CNS provided that no other family member is employed in the country of residence. The health fund in the country of residence must then send the CNS a certificate confirming that these family members have no independent entitlements in their country.
French cross-border workers: dual CNS + CPAM cover
French cross-border workers employed in Luxembourg enjoy a unique arrangement: they can maintain dual enrolment with the CNS in Luxembourg and the CPAM in France. This allows them to receive treatment on either side of the border.
S072 form (all Grand Est departments)
Cross-border workers residing in one of the ten Grand Est departments — Ardennes (08), Aube (10), Marne (51), Haute-Marne (52), Meurthe-et-Moselle (54), Meuse (55), Moselle (57), Bas-Rhin (67), Haut-Rhin (68) and Vosges (88) — benefit from an automatic process: the CNS sends the S072 form directly to the relevant CPAM. Workers generally have nothing to do — they receive confirmation of their enrolment by post. The form is available around 15 days after the employment declaration to the CCSS. Exception: temporary agency workers must submit a written request, as the form is not sent automatically for them.
S1 form (cross-border workers outside Grand Est)
For French cross-border workers living outside Grand Est (e.g. Île-de-France, Normandy, etc.), the CNS issues an S1 form sent to the worker’s home address. The worker must forward it to their local CPAM. This document opens entitlements to the French social security system for care received in France. If the form has not arrived within 15 days of the employment declaration to the CCSS, it is advisable to request a copy directly from the CNS.
Treatment in France: reimbursement by the CPAM
When a French cross-border worker receives treatment in France, reimbursement comes from the CPAM at standard French rates (70% for a GP consultation, 60% for reimbursable medication, etc.). The CNS does not intervene for care received in France. Out-of-pocket costs can be significant, particularly for dental and optical care, which is why supplementary cross-border health insurance covering both territories is so important.
Treatment in Luxembourg: reimbursement by the CNS
For treatment in Luxembourg, the cross-border worker presents their CNS card. Thanks to the PID (Immediate Direct Payment) system, available at many practitioners, adults only pay the 12% co-payment directly to the doctor, with the CNS settling the remaining 88%. Without PID, the worker pays the full amount upfront and then claims reimbursement from the CNS.
Warning for French cross-border workers — A standard French mutual health fund cannot cover your treatment in Luxembourg. These funds are designed for people enrolled in the French general scheme: they will refuse to reimburse your consultations in Luxembourg because you are enrolled with the CNS. You would be paying your premiums for nothing. You must choose a dedicated cross-border supplementary health plan (Harmonie Frontalio, GMI Mutuelle, Foyer medicis…) that covers both countries.
A practical example: Sophie, a cross-border worker living in Thionville (Moselle), visits a GP in France (sector 1 rate: €26.50). The CPAM reimburses 70%, i.e. €18.55. Sophie pays €7.95 out of pocket. If she has taken out cross-border supplementary cover that reimburses the co-payment, her final cost is €0. If she sees a doctor in Luxembourg, with PID she only pays the 12% co-payment, which her supplementary plan can also cover.
Belgian cross-border workers: Belgian-Luxembourg agreement
Belgian cross-border workers benefit from a dedicated scheme under the Belgian-Luxembourg agreement of 24 March 1994. This agreement allows the CNS to top up the Belgian health fund’s reimbursement for care received in Belgium, resulting in a more favourable overall rate.
| Step | Organisation | What happens |
|---|---|---|
| 1. Treatment in Belgium | Belgian health fund | Reimbursement at Belgian rates (variable by service) |
| 2. CNS top-up | CNS Luxembourg | The health fund automatically forwards the details to the CNS, which pays a top-up to reach 93.9% of the Luxembourg rate |
| 3. Without supplementary cover | Your expense | Approximately 6% of the Luxembourg rate (100% − 93.9% = 6.1%) |
| 4. With supplementary cover | Private insurer | Covers the remaining balance + extra benefits (dental, optical, alternative medicine) |
Source: CNS — Belgian cross-border workers, Belgian-Luxembourg agreement of 24 March 1994.
The CNS top-up works automatically for Belgian cross-border workers: the health fund itself sends the necessary information to the CNS. The worker does not need to take any special action. This mechanism makes Belgian cross-border workers the best-reimbursed of the three nationalities at the basic level, with an out-of-pocket cost of only around 6% for care in Belgium.
To benefit from this scheme, Belgian cross-border workers must register with a Belgian health fund (Mutualité Chrétienne, Mutualité Socialiste, Mutualité Libérale, etc.) by presenting the BL1 form issued by the CNS. This form certifies enrolment in Luxembourg’s social security system. Without this registration, the worker cannot access reimbursement in Belgium. A Belgian health fund is not supplementary cover — it is the equivalent of basic social security. For optimal protection, Belgian cross-border workers should also take out private supplementary insurance.
Belgian cross-border worker? Compare health plans that cover both Belgium and Luxembourg.
Compare plans →German cross-border workers: S1 form and Krankenkasse
German cross-border workers living in Rhineland-Palatinate or Saarland must register with a Krankenkasse (German public health insurance fund) to access healthcare in Germany. The CNS issues an S1 form that enables this registration.
Receiving the S1 form
Around 15 days after the employment declaration to the CCSS, the CNS issues an S1 form. This document certifies that the worker is enrolled in Luxembourg’s social security system and opens entitlements to healthcare in Germany. The cross-border worker must forward it to the Krankenkasse of their choice.
Choosing a Krankenkasse
The worker must select a German public Krankenkasse (AOK, TK – Techniker Krankenkasse, Barmer, DAK, etc.) and submit the S1 form. The Krankenkasse then issues an electronic health card (elektronische Gesundheitskarte – eGK). The worker does not pay any additional contributions in Germany — these are covered through Luxembourg social security deductions.
Treatment in Germany
By presenting their eGK card, the cross-border worker is covered by the Krankenkasse at German rates. Out-of-pocket costs can be significant for certain services, particularly dental and optical care. The CNS does not intervene for care received in Germany. Supplementary health insurance covering both countries is therefore strongly recommended.
Treatment in Luxembourg
In Luxembourg, German cross-border workers present their CNS card and benefit from the same reimbursement rates as residents (88% for adults, 100% for children under 18). The PID system works in the same way. For optimal cover in both countries, a supplementary health plan with European coverage is recommended.
If a family member of the German cross-border worker already has employment in Germany, they remain covered by their own Krankenkasse. For treatment in Luxembourg, these family members can present their European Health Insurance Card (for urgent care) or obtain an S2 form for planned treatment.
Why do you need dedicated cross-border supplementary cover?
A standard health insurance plan taken out in your country of residence is not suitable for a cross-border worker in Luxembourg. Here is why tailored cover is essential.
❌ Standard health fund (France / Belgium / Germany)
- Designed for people enrolled in the local general scheme
- Refuses to reimburse treatment in Luxembourg (outside the local scheme)
- No coordination with the CNS
- You pay premiums for no real benefit on your Luxembourg treatment
- High out-of-pocket costs for cross-border care
✅ Dedicated cross-border supplementary plan
- Covers treatment in your country of residence AND in Luxembourg
- Coordinated with the CNS and your local basic scheme
- Reimburses your out-of-pocket costs on both sides of the border
- No distinction based on where you receive treatment
- Covers alternative medicine not reimbursed by the CNS
- A single point of contact for all your healthcare needs
Another major advantage of cross-border supplementary plans: they cover alternative medicine (osteopathy, acupuncture, chiropractic, naturopathy) that the CNS does not reimburse at all. Without supplementary cover, these consultations are entirely at your own expense (typically €60 to €120 per session). With a cross-border plan, some or all of these costs can be reimbursed depending on your chosen level of cover.
Insurers offering supplementary plans for cross-border workers
Only a limited number of insurers offer supplementary health plans genuinely suited to Luxembourg cross-border workers, with effective cross-border coverage. Here are the main players on the market.
Harmonie Mutuelle — Frontalio French cross-border workers
An offer dedicated exclusively to French cross-border workers living in France and working abroad (Luxembourg, Switzerland, Germany). Frontalio offers several levels of cover. Key advantages: no waiting period, identical cover in France and Luxembourg, medical teleconsultation included, 24/7 assistance, mobile app. Branches in Moselle and Meurthe-et-Moselle. Contact: harmonie-mutuelle.fr.
GMI Mutuelle — Cross-Border Range French cross-border workers
A historic Lorraine mutual insurer specialising in cross-border workers since 1948. Key advantages: no medical questionnaire, no waiting period, LorSanté centres (dental and optical) with preferential rates and full third-party payment, 24/7 assistance. Contact: gmi-mutuelle.fr.
Foyer — medicis confort French, Belgian, German cross-border workers
A Luxembourg insurer offering two products: medicis hospi+ (hospitalisation only) and medicis confort (comprehensive cover: hospitalisation, outpatient care, visual aids, dental, alternative therapies). Key advantages: Europe-wide cover, second medical opinion through Best Doctors, MyFoyer app, 24/7 assistance. Medicis confort reimburses alternative therapies at 80% up to €1,000/year. Contact: foyer.lu.
DKV Luxembourg — COMPACT HEALTH / PLUS HEALTH / EASY HEALTH Belgian, German cross-border workers
Three supplementary plans. COMPACT HEALTH covers hospitalisation, dental care and visual aids (up to €250/2 years). PLUS HEALTH and EASY HEALTH extend cover with visual aids up to €500/2 years and laser eye surgery up to €3,000. Europe-wide cover. BEST CARE+ option available. Contact: dkv.lu.
AXA Luxembourg — OptiSoins Belgian, German cross-border workers
Three OptiSoins plans: Start (hospitalisation + assistance), Active (+ outpatient care, dental, optical up to €500/2 years, alternative medicine up to €500/year) and Privilège (maximum cover: optical up to €700/2 years, alternative medicine up to €700/year). Key advantages: actual cost reimbursement, free choice of doctor in Europe, newborn covered free for up to 1 year. Contact: axa.lu.
What about the CMCM for cross-border workers? The CMCM, Luxembourg’s largest mutual insurer with 280,000 members, is primarily aimed at Luxembourg residents. It does not offer a plan specifically designed for cross-border workers seeking cover in their country of residence. For comprehensive cross-border cover, cross-border workers should look to the insurers listed above.
5 key criteria for choosing your cross-border plan
Not all supplementary plans are equal. Here are the 5 decisive criteria for making the right choice based on your cross-border situation.
Geographic cover and scheme coordination
Check that the insurer genuinely covers outpatient care in your country of residence AND in Luxembourg, at the same benefit levels. Some contracts mention « European cover » but restrict outpatient care to the country of residence, covering treatment abroad only in emergencies. Read the « Territory covered » section of the general conditions carefully.
Dental and optical reimbursement
These are the two areas where out-of-pocket costs are highest. The CNS reimburses only very limited amounts for visual aids and dental prostheses. Compare the caps: for optical, at least €300 to €500 every 2 years. For dental, check the caps on prostheses, implants and crowns.
Alternative medicine cover
The CNS does not reimburse anything for osteopathy, chiropractic, acupuncture, naturopathy, sophrology or hypnosis (€60 to €120 per session). Foyer medicis confort covers alternative therapies at 80% up to €1,000/year; AXA OptiSoins Active up to €500/year and Privilège up to €700/year.
Waiting periods and medical questionnaire
Mutual insurers (Harmonie Frontalio, GMI Mutuelle) generally apply no waiting period and require no medical questionnaire. Private Luxembourg insurers (DKV, Foyer, AXA) may impose waiting periods and request a medical questionnaire. These periods are often waived if you have been covered by equivalent insurance for at least 8 consecutive months.
Additional services and reimbursement convenience
Compare the services included: third-party payment, teleconsultation, international assistance, mobile app, reimbursement turnaround times. GMI Mutuelle offers third-party payment at its LorSanté centres. Foyer includes Best Doctors. AXA and DKV offer comprehensive digital client portals.
Watch out for geographic exclusions — Some contracts advertise « European cover » but restrict outpatient care to the country of residence only. For a cross-border worker, it is essential that the contract explicitly states that outpatient care in Luxembourg is reimbursed on the same basis as in your country of residence. If in doubt, request written confirmation.
Procedures and forms by country
Here is the complete procedure for registering correctly as a Luxembourg cross-border worker, depending on your country of residence.
🇫🇷 Procedure for French cross-border workers
Step 1: Your Luxembourg employer registers you with the CCSS within 8 days. You receive your 13-digit CNS number by post.
Step 2: Around 15 days later, the CNS automatically sends the S072 form to your CPAM if you live in Grand Est. Otherwise, you receive an S1 form to forward yourself. Note: temporary agency workers must submit a written request.
Step 3: The CPAM confirms your enrolment. You are covered by the CNS in Luxembourg and the CPAM in France.
Step 4: Take out cross-border supplementary cover for both countries. Documents required: CNS certificate, carte Vitale, bank details, ID.
🇧🇪 Procedure for Belgian cross-border workers
Step 1: Same CNS enrolment (employer → CCSS → identification number).
Step 2: The CNS issues a BL1 form.
Step 3: Register with a Belgian health fund using the BL1 form.
Step 4: Treatment in Belgium: health fund reimbursement + automatic CNS top-up.
Step 5: Take out private supplementary cover (DKV, Foyer, AXA).
🇩🇪 Procedure for German cross-border workers
Step 1: Same CNS enrolment (employer → CCSS → identification number).
Step 2: The CNS issues an S1 form (around 15 days later).
Step 3: Choose a Krankenkasse (AOK, TK, Barmer, DAK) and send your S1. You receive your eGK card.
Step 4: Use your eGK in Germany, your CNS card in Luxembourg.
Step 5: Take out European supplementary cover (DKV, Foyer medicis, AXA OptiSoins).
If you lose your job in Luxembourg — Temporary continuation of healthcare rights may be granted (current month + 3 months, if enrolled for at least 6 months). Contact your local health fund promptly. Your cross-border plan can be cancelled free of charge upon proof of termination.
Frequently asked questions about cross-border health insurance
Is supplementary health insurance compulsory for cross-border workers?
No, supplementary health insurance is not compulsory in Luxembourg. However, it is strongly recommended: the CNS only reimburses 88% of medical expenses for adults and does not cover alternative medicine or optical beyond very low caps. Cross-border workers also have specific needs for cover in two countries.
Can I keep my standard health fund as a cross-border worker?
No, in the vast majority of cases. Standard health funds will refuse to reimburse your treatment in Luxembourg because you are enrolled with the CNS rather than the local general scheme. You need a dedicated cross-border supplementary plan that covers both countries.
How does the CNS top-up work for Belgian cross-border workers?
Under the Belgian-Luxembourg agreement of 24 March 1994, the CNS pays a top-up after the Belgian health fund’s reimbursement, bringing the total to 93.9% of the Luxembourg rate. The process is automatic: the worker does not need to take any action.
What happens if I lose my job in Luxembourg?
Temporary continuation of healthcare rights may be granted (current month + 3 months, if enrolled for at least 6 consecutive months). Contact the CCSS and your local health fund promptly. Your cross-border plan can be cancelled free of charge upon proof of termination.
Can my family be covered?
Yes, all cross-border supplementary plans offer family options. With the CNS, your spouse and children can be co-insured provided no family member is employed in the country of residence.
Is alternative medicine covered?
The CNS does not reimburse osteopathy, chiropractic, acupuncture or naturopathy (€60 to €120 per session). Cross-border plans cover these depending on the level chosen: Foyer medicis confort at 80% up to €1,000/year, AXA Active up to €500/year, Privilège up to €700/year. → Alternative medicine guide
Can I only receive treatment in my country of residence?
Yes, you have free choice. French workers are reimbursed by the CPAM in France and the CNS in Luxembourg. Belgian workers by the health fund + CNS top-up in Belgium. German workers by the Krankenkasse in Germany. A cross-border plan covers both territories without distinction.
How do I take out cross-border supplementary cover?
Use our health insurance comparison tool to compare plans suited to your situation. Enter your country of residence, age and priorities. Documents typically required: CNS certificate, carte Vitale or equivalent, ID, bank details.