Sending your bills to the CNS: address, online submission and documents to attach
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Practical guide · trigger.lu
Sending your bills to the CNS: address, online submission and documents to attach
- PID
- nothing to send, the CNS has already paid the doctor
- Digital
- the bill is waiting for you in the app
- Paper bill
- send by post
Details
With the PID, you only pay your share at the doctor's and the CNS transfers the rest directly. The PID mémoire d'honoraires isn't sent to the CNS.
- Tool
- GesondheetsApp, the CNS app
- Path
- Documents, then Transmettre (send)
- You need
- an active eSanté account
Details
This only works if your doctor or dentist in Luxembourg uses Digital Reimbursement. Two cases still go by post (or to the counter): a bill you didn't pay at the practice on the day (for example, paid later by bank transfer), with your proof of payment (your bank's debit advice), and a treatment whose reimbursement requires a prescription, with the prescription. Sent through the app? Go straight to step 5.
- Bill
- the original, not a copy
- On the bill
- the patient's 13-digit number
- Proof of payment
- “pour acquit” or debit advice
- Avoid
- staples, sticky notes, cover letter
- Bank account
- declared once on MyGuichet.lu (do it if you haven't yet)
Details
Make a copy of your bills before sending them: the CNS keeps the originals.
- Address
- CNS, Remboursements, L-2980 Luxembourg
- Stamp
- not needed from Luxembourg
- Deadline
- 2 years after paying the bill
- Where
- your private space on MyGuichet.lu
- Option
- eDelivery to receive the details as a PDF
Details
You declare your bank account only once, through the CNS online procedure on MyGuichet.lu. Don't write it again with every submission: the CNS says this adds a check and can delay your refund.
This is for you if
You've paid a doctor, a dentist or another healthcare provider in Luxembourg and want to get back the CNS share.
You're looking for the CNS postal address for your bills.
Your doctor mentioned the GesondheetsApp and you don't know how to use it.
You're a cross-border worker insured with the CNS and you paid for treatment in Luxembourg. Treatment in your country of residence, on the other hand, is reimbursed by your local fund (the CPAM in France, for example), not by the CNS.
you're looking for where to send a sick leave certificate: it goes to another CNS address (Indemnités pécuniaires department, L-2980 Luxembourg), or online. Nor if you're a civil servant or State employee: your bills go to the CMFEP, by post (see below).
The right address for what you're sending
The CNS has several departments at the same postcode. Put the right name on the envelope and your file will go straight to the right place.
| What you're sending | Address |
|---|---|
| Bills and mémoires d'honoraires to be reimbursed | Caisse nationale de santé, Remboursements, L-2980 Luxembourg |
| Bills paid for someone other than your co-insured persons (form B) | CNS, L-2980 Luxembourg |
| Certificate of incapacity for work (sick leave) | Caisse nationale de santé, Indemnités pécuniaires, L-2980 Luxembourg |
For a question about your file, the CNS answers on (+352) 2757-1, Monday to Friday from 8:00 to 16:30. Are you a civil servant or State employee? Your bills don't go to the CNS but to your fund, the CMFEP (47, boulevard Prince Henri, L-1724 Luxembourg), and only by post for now.
Proof of payment: what works and what is refused
This is the most common cause of delay. The CNS only reimburses costs you have already paid, and it must be able to check this.
Accepted:
- the mention “pour acquit le” (received with thanks on) on the bill, with the doctor's signature and the payment date;
- your bank's stamp or signature with the mention “payé”, “pour acquit” or “virement exécuté” (paid, received, transfer executed);
- the printed debit advice from a Luxembourg bank, with the bill's reference number, showing who paid, who received and which bank executed the payment.
Refused or to be completed:
- screenshots;
- a simple payment order made online: print the debit advice, usually available the day after the transfer;
- some monthly statements or simplified extracts, which don't show the payee or the bank: the CNS may then ask you for an additional document.
Is your bank abroad? The document must show that the payment was executed, the amount debited, the date, the bill reference, the payee and the bank.
Put your documents in order: bill 1 and its debit advice, bill 2 and its debit advice, and so on.
And your supplementary health insurance?
The CNS doesn't reimburse your whole bill: your personal contribution remains, and sometimes extras it doesn't cover. We explain what's left for you to pay in our guide on reimbursement of healthcare costs.
- With the PID, the CNS sends you a statement of PID services (by post, or in MyGuichet.lu if you've activated eDelivery). That's the statement you can send to your supplementary health insurance.
- With a standard refund, keep a copy of your bill before sending it to the CNS, for your supplementary insurance.
If you don't have supplementary insurance and your out-of-pocket costs are climbing (dentist, glasses, physio), it's the right time to look into it. An insurance adviser can compare for you and call you back. To understand what it covers, read our guide on supplementary health insurance.
An advisor from the agency will call you back.At a branch: immediate reimbursement
You can also get reimbursed straight away, by cheque or by instant transfer, by going to the counter of a CNS branch. Two conditions:
- your total medical costs reach at least 100 € per household;
- you've made an appointment at the branch within 14 days of paying the bill.
Treatment received abroad isn't reimbursed at a branch (except for a few flat-rate amounts). A CNS cheque is cashed at a POST Luxembourg office within 30 days, by the person it is made out to.
Your bills for treatment abroad
Did you pay a doctor while on holiday? The file goes to the same address, with a few extra documents:
- the original bill, with the 13-digit number of the person treated on each document;
- a note explaining what treatment you received and why;
- the relevant prescriptions and medical reports;
- a proof of payment: stamped, signed and dated bill, or debit advice (no screenshot).
When the reimbursement is made at Luxembourg rates, the CNS indicates a timeframe of about 6 to 8 weeks. When it first has to ask the fund of the country where you were treated for its rates, it can take much longer. Leaving soon? Our page on preparing your first trip outside Europe helps you get organised.
Common mistakes
Sending a copy
Instead of the original: the CNS asks for the original bills.
Attaching a screenshot
From your banking app: it's refused.
Forgetting the 13-digit number
Of the person treated, for example on your child's bill.
Stapling, taping or writing on
The bills, or adding a “Please find enclosed” letter: the CNS asks you to avoid this.
Writing your IBAN again
With every submission: once registered, your account is enough.
Letting it drag on
After 2 years, the request is refused.
Sending a PID bill to the CNS
There's nothing to reimburse, the CNS has already paid the doctor.
Frequently asked questions
Caisse nationale de santé, Remboursements, L-2980 Luxembourg. From Luxembourg, a standard letter needs no stamp.
Yes, with the GesondheetsApp, if your doctor or dentist in Luxembourg uses Digital Reimbursement. You need an active eSanté account. A standard paper bill goes by post or is presented at a branch.
2 years from the day you paid the bill. After that, the CNS refuses the request.
In your private space on MyGuichet.lu: with eDelivery activated, you receive the details of each refund there as a PDF. The details also show the bank account used.
No. The CNS has already paid its share to the doctor. You can send the statement of PID services to your supplementary health insurance if you have one.