CNS Enrollment in Luxembourg: Steps to Follow Based on Your Situation

Are you coming to Luxembourg to work, start a business, study, or join your family? Your eligibility for health insurance depends on your employment status, family situation, and whether you have coverage in another country.

People often refer to “enrollment with the CNS,” but the process generally begins with the Joint Social Security Center (CCSS). The CCSS registers your enrollment in the social security system, while the National Health Fund (CNS) manages, among other things, health insurance for private-sector employees, reimbursement of medical expenses, co-insurance for family members, and numerous health-related procedures.

More information on health insurance.

For employees, enrollment is normally handled by the employer. Self-employed individuals, however, must file their own registration. Non-working spouses, children, students, retirees, job seekers, or individuals already covered abroad are subject to different rules.

This guide helps you identify the enrollment process for the health insurance fund that corresponds to your profile. To gain a broader understanding of the roles of the CCSS, the CNS, the social security card, and how health insurance works, visit our page dedicated to health insurance funds and social security in Luxembourg.

CCSS or CNS: Which agency are you enrolled with?

Enrollment in the Luxembourg social security system is processed by the CCSS (Centre Commun de la Sécurité Sociale). Depending on your situation, this enrollment entitles you to benefits under various branches of social protection: health and maternity, pensions, accidents, and long-term care.

The CNS (National Health Fund) then acts as the health insurance provider for private-sector employees and many other insured individuals covered by the general social security system. In particular, it handles reimbursement of medical expenses, certain procedures related to sick leave, co-insurance for family members, and health benefits.

Organization	Primary Role	Examples of Procedures
CCSS	Registering members and collecting social security contributions.	Enrollment form, membership certificate, social security card, voluntary insurance.
CNS	Manage health insurance and health benefits for insured individuals under its jurisdiction.	Reimbursements, cost-sharing, bank account information, medical care abroad, and tracking of certain benefits.

What enrollment procedure applies to your situation?

The following table provides an initial guide. Cross-border or international situations must always be examined on a case-by-case basis.

Situation	Who handles the enrollment?	Main Procedure
Private-sector employee	The employer	Verify that the enrollment declaration has been properly registered by the CCSS.
Self-employed individuals or sole proprietors	The individual concerned	Submit a registration form to the CCSS, generally within 8 days of starting the business.
Spouse or partner not engaged in any work	The primary insured person and the CNS	Verify eligibility for co-insurance and submit the required supporting documents.
Child without personal coverage	The insured parent and the CNS	Have the child’s co-insurance file reviewed or completed.
Student	Depending on their country of origin and existing coverage	Check whether family coverage, the EHIC, an international agreement, or student enrollment with the CCSS applies.
Unemployed person receiving benefits	The agency providing the replacement income	Verify that membership remains active during the period of benefits.
Retiree or pensioner	Depending on the country paying the pension and the country of residence	Identify the competent country and register with the health insurance provider in your place of residence if necessary.
Cross-border worker	Luxembourg employer	Enroll in the Luxembourg system and then complete the necessary formalities with the health insurance fund in your country of residence.
Employee posted to Luxembourg	Employer based abroad	Verify whether the individual remains enrolled in their country of origin during the assignment.
Individuals not working and without other coverage	The individual concerned	First, explore the option of co-insurance; if that is not possible, consider voluntary health insurance.

Enrollment with the CNS for an employee in Luxembourg

When you start a salaried job in Luxembourg, your employer must register you with the CCSS. This registration enables your enrollment in the various mandatory branches of social security.

You normally do not need to submit a registration form yourself. However, it is still prudent to verify that the process has been completed, especially if:

• you are working in Luxembourg for the first time;
• you are coming from abroad;
• you have not yet received any mail or documents from social security;
• your personal information or address is not correctly recorded.

Once your enrollment is registered, you will receive or retain your 13-digit national identification number. Your social security card will then be mailed to you in accordance with the applicable procedures.

Employees residing in Luxembourg

If you live and work in Luxembourg, you are generally covered by the Luxembourg social security system. You can then use your coverage for medical care in Luxembourg and request reimbursement of your expenses in accordance with the applicable rules.

Employees Living Abroad

Employees who work in Luxembourg but reside in France, Belgium, or Germany are generally enrolled in the Luxembourg system by their employer. However, they must take additional steps to be eligible for medical care in their country of residence.

Find out more about the specifics of this situation in our guide on healthcare for cross-border workers.

Enrollment of an Entrepreneur or Self-Employed Individual

Enrollment of a Self-Employed Person on Their Own Behalf

Self-employed individuals must file their own registration with the CCSS. This requirement applies in particular to sole proprietors, certain independent professionals, and individuals engaged in self-employment subject to the Luxembourg social security system.

In principle, the registration must be submitted no later than 8 days after the start of the activity. Once registered, the self-employed individual pays their own social security contributions.

Depending on their status, type of business, or ownership interest in a company, a business owner may, however, be considered self-employed or an employee. It is therefore important to verify which system applies to the activity actually being carried out.

Spouse or Partner Assisting the Self-Employed Individual

A spouse or partner who regularly participates in the self-employed activity may qualify for a specific status as an assisting spouse. This situation should not be confused with the co-insurance of a spouse who is not employed.

If your spouse actually works in the business, verify whether they must be personally enrolled in the CCSS rather than covered as a family member.

Co-insurance for a Spouse or Partner Who Is Not Economically Active

A spouse or partner who does not have personal coverage may, under certain conditions, receive free health insurance through the primary insured person. This coverage is called co-insurance.

Co-insurance is not always automatically registered, particularly when the family arrives from another country or when a household member was previously insured through a foreign health insurance fund.

Depending on the situation, the CNS may request:

• a marriage certificate or proof of a registered partnership;
• proof of residence;
• proof that coverage with the previous health insurance provider has ended;
• a previous co-insurance certificate;
• information about the foreign health insurance provider and social security number.

A person who is employed or already has personal coverage cannot normally be co-insured under the same plan.

Enrollment and Co-Insurance of Children

Children may be covered as family members of an insured parent, provided they meet the conditions set forth by Luxembourg law.

For a child born in Luxembourg, the relevant information may be forwarded to the appropriate agencies by the authorities. For a family arriving from abroad, additional documents may be required to confirm the child’s identity, family relationship, and previous insurance status.

Special attention is required for:

• children of legal age;
• students living or studying abroad;
• blended families;
• children whose parents work in two different countries;
• children who already have personal health coverage.

What health insurance options are available for students?

A student’s situation depends on their age, place of residence, family health coverage, and country of origin.

Students Already Covered by Their Family

A student may remain covered under a parent’s policy if certain conditions are met. However, it is important to verify the continuity of coverage, particularly when studying in another country or changing residence.

Students from a European country or a country with a treaty

A student who remains validly insured in a country of the European Union, the European Economic Area, Switzerland, or a country with which Luxembourg has a treaty may not need to enroll with the CCSS.

They must have the documents corresponding to their situation, such as a European Health Insurance Card or a treaty form, and may need to register with the CNS if they require medical care in Luxembourg.

Students without other valid coverage

When no family, European, treaty-based, or equivalent coverage applies, an application for mandatory student enrollment may need to be submitted to the CCSS.

Enrollment for Job Seekers

Simply registering as a job seeker does not always mean that health coverage is automatically maintained.

When a person residing in Luxembourg receives unemployment benefits or certain types of replacement income, social security contributions are deducted, and their coverage may be maintained by the relevant agency.

If you are registered with ADEM but are not receiving benefits, if your benefits are about to expire, or if you have recently arrived from abroad, check your status with the CCSS and the CNS as soon as possible to avoid a gap in coverage.

Health Insurance Enrollment for Retirees

The applicable insurance fund for a retiree depends, in particular, on their country of residence and the country or countries paying their pension.

A retiree living in Luxembourg and receiving a Luxembourg pension may be covered by the Luxembourg system. When a pension is paid by another country or when multiple countries are involved, European or treaty rules determine the competent authority.

If you are moving to Luxembourg to retire:

• contact the health insurance fund in your former country of coverage;
• determine which country is responsible for your coverage;
• request the documents needed to transfer or register your benefits;
• contact the competent health insurance fund in your place of residence.

Cross-border workers: enrollment in Luxembourg and healthcare in the country of residence

A cross-border worker employed in Luxembourg is generally registered with the CCSS by their employer and is covered by the Luxembourg health insurance system.

To also receive healthcare in their country of residence, they must register with the local health insurance fund using the document or procedure specified for their country.

This step is important not only for the worker but also for their family members, whose benefits may depend on the rules of the country of residence.

Seconded Employees or Individuals Working in Multiple Countries

An employee temporarily seconded to Luxembourg may remain subject to the social security system of their country of origin. In this case, they are not enrolled in the Luxembourg system in the same way as a locally hired employee.

The situation is also unique if you:

• work regularly in multiple countries;
• work remotely from your country of residence;
• combine salaried and self-employed work in different countries;
• work successively for several international employers.

The applicable legislation then depends on the distribution of your work and on European or treaty-based rules. Have your situation reviewed before you start or change your work arrangements.

Individuals without employment and without personal coverage

A person who is not employed must first verify whether they can be:

1. covered under a spouse’s, partner’s, or parent’s insurance;
2. covered under a pension, replacement income, or a foreign plan;
3. eligible for voluntary health insurance through the CCSS.

Voluntary health insurance may be available to individuals at least 18 years of age who are not eligible for any other coverage, provided they meet the required residency and eligibility criteria.

People with disabilities, minors, or dependent individuals

The concept of dependency should not be confused with enrollment in health insurance.

A person receiving long-term care benefits must also have their own health insurance coverage, either as a primary insured, a co-insured, or a beneficiary of another plan.

In certain situations, enrollment in health insurance for a minor or a person recognized as having a disability who cannot be insured otherwise may be requested from the CCSS. Medical documentation and proof of previous coverage may be required.

In addition, a person who regularly provides assistance and care to a dependent individual may, under certain conditions, be eligible for coverage of pension contributions. This measure applies to their pension eligibility and does not, in and of itself, constitute enrollment in the CNS.

Civil servants, public employees, and staff of international institutions

Certain categories of individuals are not covered by the CNS even when they work or reside in Luxembourg.

This is particularly the case for certain:

• civil servants and public sector employees;
• municipal employees;
• employees of European Union institutions;
• staff of international organizations with their own health insurance system.

These individuals may be covered by another health insurance fund or an independent plan. Their spouses and children must also be enrolled in accordance with the rules of that specific plan.

What documents do you need to prepare for enrollment or co-insurance?

The required documents vary depending on your profile, but the following may be necessary:

• identity card or passport;
• Luxembourg social security number, if already assigned;
• employment contract or proof of employment;
• residence permit or documentation related to self-employment;
• proof of residence;
• marriage certificate or proof of civil partnership;
• birth certificate or family register;
• certificate of enrollment or proof of enrollment in an educational institution;
• certificate of termination of membership or co-insurance with the previous health insurance provider;
• European or conventional form, depending on the country in question;
• bank account information for future reimbursements.

Foreign documents may need to be accompanied by a translation or additional information, depending on the case.

How can you verify that your coverage is active?

Don’t just wait until your first reimbursement request to verify your status.

In particular, you can:

• view your registered enrollments in your MyGuichet.lu account;
• generate a CCSS enrollment certificate;
• verify that you’ve received your social security card;
• verify your personal information and address;
• check with the CNS to verify your family members’ co-insurance coverage;
• save your bank account information to facilitate reimbursements.

The membership certificate can be generated and downloaded immediately from MyGuichet.lu once the process is available in your personal account.

After enrolling with the CNS: How do you use your health coverage?

Once your enrollment is active, you can access healthcare services and request reimbursement in accordance with the applicable rules.

Find our practical information on:

• how the Luxembourg healthcare system works;
• reimbursement for healthcare;
• medical appointments in Luxembourg;
• the potential benefits of supplemental health insurance.

FAQ: Enrollment in the CNS in Luxembourg