Brexit has made planned treatment a question of legal status, not simply a question of carrying a European health card. A British national who lives in France may need treatment in the United Kingdom, but the correct funding route depends first on which country is responsible for that person’s healthcare. A GHIC or EHIC normally concerns medically necessary care during a temporary stay. An S1 registration gives access to healthcare in the country of residence under the applicable coordination rules. An S2 is different: it is a prior-authorisation certificate for specified planned treatment in another country, usually at a named state provider and during a stated period.
The practical difficulty is that “British resident in France” does not identify the competent institution by itself. A French worker, a French pensioner, a person covered by a registered UK S1, and someone who has only private insurance can face different answers. This guide explains how to identify the responsible system, when an S2 request may be relevant for planned NHS treatment, what evidence to assemble, and how to challenge a refusal or protect a reimbursement claim. It focuses on the legal position after Brexit and on the distinction between French social-security cover, UK-funded cover and temporary travel cover.
I. Can a British resident in France use an S2 form for planned treatment in the United Kingdom?
A. Which country is responsible for your healthcare after Brexit?
The first step is to identify the “competent state”. In plain terms, this is the country whose healthcare institution bears responsibility for the relevant treatment. Residence, nationality and the place where a hospital is located are not interchangeable tests. A British passport does not automatically make the NHS the payer, and living in France does not automatically make the French social-security system responsible for every person who lives there.
For a person working in France, the ordinary starting point is French social-security affiliation. The same may apply to a person who has opened rights through the French system on another lawful basis. Article L. 160-1 of the French Social Security Code describes the general entitlement of a person working or, without professional activity, residing in France in a stable and regular way. Its opening rule refers to “Toute personne travaillant ou, lorsqu’elle n’exerce pas d’activité professionnelle, résidant en France de manière stable et régulière”. That general entitlement still has to be applied alongside international coordination rules and the person’s actual administrative record.
If you receive a United Kingdom state pension or another UK benefit and have registered an S1 in France, the position is more specific. The S1 is evidence that the United Kingdom remains financially responsible for healthcare under the relevant coordination arrangement. Registration with the French health fund can give you access to the French system on the applicable basis, but it does not turn every future treatment into a French-funded treatment. It is important to keep the S1 registration confirmation, the name of the issuing institution and any reference number. When a French administrative decision says that the UK remains competent, ask the CPAM (the local French primary health-insurance fund) to identify the route in writing rather than assuming that an S2 must be requested from the wrong country.
The UK government’s guidance on healthcare in France distinguishes between an S1 route, temporary treatment using a GHIC or EHIC, and other forms of cover. Its healthcare guidance for France should be read with the current NHS information on planned treatment abroad. If your healthcare is UK-funded because you hold a registered S1, contact the relevant UK Overseas Healthcare Services channel and the French health fund before arranging planned treatment. Ask both institutions which one must authorise the proposed course of care and which form they will accept. Keep the responses; they may later prove that you took the correct administrative route.
For the related question of registering an S1 in France and challenging a CPAM refusal, see this guide to healthcare in France after Brexit. That article concerns the residence-side healthcare route; this one addresses the separate problem of planned treatment in the United Kingdom.
This distinction matters because an S2 is not a general travel document. It does not prove that you are insured for all care in the United Kingdom, and it does not replace registration of an S1. It is linked to planned treatment, the treatment provider and a period of care. A person who is registered in France under an S1 may therefore need to begin with the French fund for ordinary access in France, but the institution responsible for authorising planned care in the UK may depend on the particular UK-France arrangement and the benefit that gives rise to the S1.
There are four common situations:
- A British employee working in France is normally directed first to the French affiliation record and the French fund responsible for that record.
- A British pensioner living in France with a registered UK S1 must preserve the link to the UK institution that issued the S1 and should not treat the French registration as proof that France bears every planned-treatment cost.
- A person visiting France temporarily may rely on a GHIC, a valid UK-issued EHIC or a provisional replacement certificate for medically necessary care, but that is a different fact pattern from a French resident travelling to the UK for planned treatment.
- A person with only private cover must check the policy and the provider’s authorisation rules; neither private insurance nor a residence permit alone creates an S2 entitlement.
The statutory framework also shows why the answer cannot be reduced to a slogan. Article L. 332-3 of the French Social Security Code begins with the words “Sous réserve des conventions et des règlements internationaux”. The international instrument is therefore central where treatment involves the UK. A refusal that simply says “you are British” or “you live in France” without identifying the applicable basis may be too vague to allow an effective challenge.
Before making an S2 request, write a short status summary. State where you live, where you work or receive your pension, whether your S1 is registered, which health fund currently reimburses your French treatment, and whether the proposed UK provider is an NHS or other state provider. Include the exact treatment, the proposed dates and the reason the treating team considers the UK route necessary. This summary helps the fund decide whether it is dealing with a French-insured person, a UK-funded S1 holder or a temporary visitor. It also prevents a common error: using a GHIC claim form to ask for approval of care that has been planned months in advance.
B. What treatment and evidence qualify for S2 authorisation?
An S2 request concerns treatment that is planned before departure. The certificate is not a promise that any hospital bill will be paid. It normally identifies the authorised care, the country, the provider and the dates. The provider must be able to treat the patient under the public or state-healthcare route to which the certificate applies. A private appointment that is outside the relevant public system may remain payable by the patient even if the medical need is genuine.
The CLEISS explanation of the S2 form describes it as “Formulaire S2 – Droit aux soins programmés”, meaning a form for entitlement to planned treatment. CLEISS also explains that the certificate is requested from the institution that bears the cost and is not issued by CLEISS itself. For a person covered by the French general system, the practical request is normally made to the CPAM, with the CNSE (the French National Centre for Cross-Border Healthcare) involved in the medical and cross-border assessment. Use the current instructions supplied by your fund, because a routing error can delay the request.
French law supplies a useful framework, but it must be read carefully for a post-Brexit UK case. Article R. 160-2 of the French Social Security Code regulates prior authorisation for certain planned care in the European coordination area. It covers, in particular, care involving at least one overnight stay or highly specialised and costly equipment. It also sets a test based on whether the treatment is covered, appropriate, and unavailable in France within a medically acceptable time under the conditions described by the article. The text says that “Les décisions de refus sont dûment motivées et susceptibles de recours devant le tribunal judiciaire spécialement désigné compétent.”
That provision should not be copied mechanically into every UK file. The French health-insurance information on planned treatment abroad explains that the France-UK coordination rules have their own limits. The official guidance distinguishes medically necessary care during a temporary stay from planned major treatment and states that prior authorisation is required for the relevant planned care. It also warns that ordinary non-urgent outpatient treatment in the UK is not automatically covered under the France-UK arrangement. Your application must therefore identify the legal route and the type of care; “the hospital is in the UK” is not enough.
A complete file should normally contain:
- a recent, detailed medical certificate from the French or UK clinician who is treating you;
- the diagnosis or condition, the proposed procedure or course of treatment, the clinical reasons for seeking it in the UK, and the consequences of delay;
- the proposed provider’s full name, address, public or private status, department, consultant, proposed dates and estimated cost;
- confirmation of whether the provider accepts the relevant S2 route and whether it will bill the public system directly;
- your French health-insurance number, S1 registration evidence if relevant, proof of residence and the name of the institution that currently bears your healthcare costs;
- medical records, scans, referrals, waiting-time information and any evidence explaining why the proposed UK care is clinically appropriate;
- a short covering letter asking for a written decision, the legal basis, the authorised dates, the provider covered and the patient contribution that may remain payable.
The medical certificate should answer the fund’s questions without turning into a general letter of support. It should explain the treatment in precise terms, distinguish diagnosis from the requested procedure, state whether the care is available in France, and identify the medically acceptable time frame. If the argument is that the UK team has a particular technique or that a French waiting list creates a clinical risk, ask the clinician to state that clearly and provide dates. A preference for a particular surgeon, a lower private price or a wish to combine treatment with a family visit is unlikely to prove that the statutory conditions are met.
Do not book non-refundable travel or pay a large deposit before receiving the written authorisation. If the procedure is urgent, ask the treating team and the health fund to explain whether it is still legally “planned” or whether an urgent-care route applies. The legal treatment of an unplanned event is different. Article R. 160-1 refers to healthcare that is “médicalement nécessaires au cours d’un séjour temporaire”. That concept concerns necessary care during a temporary stay; it does not convert a pre-booked operation into temporary-stay care simply because the patient travelled from France.
The same distinction appears in the official Service-Public information on healthcare for a foreign visitor in France. It explains the GHIC or EHIC route for a UK visitor and the steps to take if a doctor or hospital refuses the card. The page is useful for checking the visitor route, but it is not the correct authority for a French resident seeking planned NHS treatment. If you have already read advice about a GHIC reimbursement claim, do not assume that it answers the S2 question.
The provider’s status is particularly important. In a decision of the Cour d’appel de Rennes, RG no. 23/04276, the court described the S2 as showing rights and cover only for care approved by the medical adviser, in the country and establishment, during the period shown. The decision also records that “Le formulaire S2 n’est pas accepté par tous les établissements de soins notamment, les établissements privés.” That is a practical warning: obtain written confirmation from the UK provider before relying on the form, and make the provider’s public/private status part of the authorisation request.
The form may also impose local conditions. An S2 is not a guarantee that a UK provider will waive every charge that a local patient would pay. Ask about NHS eligibility, prescription charges, accommodation, transport, consultant fees, private-room costs, rehabilitation and medicines supplied after discharge. Ask the French or UK institution which of those items fall outside the authorisation. A treatment can be approved while related services remain the patient’s responsibility.
For a French-insured resident, send the request before treatment to the fund that administers the French cover, following its current channel and keeping proof of receipt. For an S1 holder, send the same factual file to the French fund and the UK institution responsible for the S1, but ask each one to confirm who must issue or validate the authorisation. If the two institutions disagree, request a written “competent institution” decision. That document is more useful than a series of telephone assurances if the hospital later asks who will pay.
II. What can you do if the S2 request or reimbursement is refused?
A. How should you challenge a refusal before treatment?
Start by obtaining the refusal in writing. A telephone message saying that “S2 is not possible after Brexit” does not tell you whether the problem is nationality, the competent state, the proposed provider, the medical criteria, an incomplete file or the fact that the treatment is ordinary outpatient care. Ask for the decision, the date of notification, the legal provisions relied upon, the institution that is said to be competent, and the appeal route. If the fund says that the UK is responsible because of your S1, ask it to state whether the request should be sent to the UK institution and which form replaces or accompanies S2.
Then separate two issues that are often mixed together. The first is entitlement: do you have a right to healthcare through the relevant French or UK system? The second is prior authorisation: even if you are insured, does this particular planned treatment in this particular UK establishment satisfy the conditions for public funding? A refusal on the first issue requires evidence of affiliation or S1 registration. A refusal on the second requires medical and provider evidence. Repeating the same documents without answering the reason for refusal will rarely change the decision.
For a person covered by the French system, the refusal should normally be challenged through the mandatory prior administrative route where the decision falls within the social-security disputes covered by Article L. 142-4. The article states that “Les recours contentieux … sont précédés d’un recours préalable”. The internal body is the CRA, or Commission de recours amiable, meaning the amicable appeal commission of the fund. Do not send a general complaint to a hospital and assume that it preserves the appeal against the CPAM decision.
Article R. 142-1 provides that the CRA must be seized within two months from notification of the decision. It states that “Cette commission doit être saisie dans le délai de deux mois”. Count from the date on which the decision was notified, not from the date on which you first asked a doctor for help. Send the appeal in a form that proves receipt, identify the decision precisely, state the remedy sought, and attach a numbered bundle of medical, administrative and provider documents.
The appeal should ask for a fresh assessment, not merely say that the treatment is important. Explain:
- which country is competent and why, including the S1 position if relevant;
- why the treatment is planned and why the chosen provider is within the public route;
- which legal and medical condition in the refusal has been misunderstood or satisfied;
- why the proposed time abroad is medically justified and what delay in France would mean;
- which costs are requested and which costs you accept may remain yours.
Attach the provider’s written confirmation that it accepts the relevant public funding arrangement. If the provider is private, ask whether a public hospital or NHS trust can deliver the same care under S2. If a UK clinician has recommended treatment in France or another country rather than in the UK, the direction of travel changes the competent institution and the form. The correct answer is always tied to the proposed country and the institution bearing the cost.
There may be a medical dispute as well as an administrative dispute. A fund can accept that you are insured but dispute the diagnosis, the necessity of the treatment abroad, or the medically acceptable waiting time. Ask which part of the file is being treated as medical evidence and which part is an administrative decision. Article L. 142-1 places social-security disputes within the relevant court jurisdiction and distinguishes disputes that require a medical assessment. This distinction affects the evidence and the route; a court cannot replace a missing medical certificate with a general statement about Brexit.
A decision of the Tribunal judiciaire de Paris, RG no. 21/02307, illustrates why the classification of the care matters. The court recorded that, for care ultimately treated as unforeseen, the claimant “n’avait pas à fournir de formulaire S2”. That does not create a shortcut for planned treatment. It shows instead that the court first asks whether the care was genuinely unforeseen or had been arranged in advance. Preserve appointment dates, referrals and messages, because those documents may determine the classification.
If the planned treatment is imminent, tell the appeal body the clinical deadline and ask for an urgent written response. Do not describe a non-refundable holiday deadline as a medical deadline. If the procedure cannot safely wait, ask the treating doctor whether postponement is medically possible and ask the fund whether an expedited medical review exists. Where the patient chooses to proceed without authorisation, obtain a written cost warning and understand that a later reimbursement claim may fail even when the treatment itself was medically appropriate.
For a UK-funded S1 holder, send a parallel factual request to the UK institution responsible for the S1 and the French fund that registered it. Ask the UK institution whether it can issue an S2, a certificate of entitlement or another authorisation for the proposed NHS treatment. Ask the French fund whether it will recognise the planned treatment under the France-UK arrangement. The point is not to file duplicate appeals blindly; it is to obtain a decision from the institution that legally controls the expenditure.
B. How do you protect reimbursement, costs and court deadlines?
If the S2 is granted, keep the original authorisation and check every field before travelling. Compare the name of the patient, the UK country code, the provider, the treatment description and the valid dates with the hospital booking. Ask the provider to confirm how it will process the form. If the hospital says that it cannot accept S2, stop and obtain clarification before the procedure. The Rennes decision shows why a certificate with the wrong establishment or an excluded private provider can leave a patient exposed.
If you have had to pay despite an S2, request an itemised invoice, proof of payment, the provider’s explanation, the certificate and the medical report. Ask the health fund which claim form is required. For a French-insured patient, the official cross-border process may require a claim such as Form S3125 together with paid invoices and proof of treatment. For a UK-funded S1 holder, the UK institution may require a different process. Do not assume that sending a GHIC claim form to CPAM is enough simply because the hospital was in the UK.
There is a legal difference between reimbursement at the rate of the country where the care was provided and reimbursement at the rate that would have applied in France. The S2 route normally works through the public system of the treatment country and its local patient conditions. A private upgrade, a consultant fee outside the public tariff, travel, accommodation and services outside the certificate can remain payable. Before travelling, ask for a written estimate of the patient contribution. After treatment, compare the hospital’s invoice with the authorised treatment rather than disputing the whole bill at once.
If the claim is refused, ask for the refusal in writing and identify whether it is a refusal of entitlement, a refusal because prior authorisation was missing, a dispute about the provider, or a calculation of the reimbursable amount. Each reason needs a different response. Attach the S2 and proof that the provider and dates matched it. If the institution says that the care was outside the authorised period, explain any admission or discharge change with hospital records. If it says that the treatment was private, ask the provider to identify the public service that was or was not used.
Record the date on which the fund receives your CRA appeal. Article R. 142-6 says that when the commission’s decision is not notified within two months, “l’intéressé peut considérer sa demande comme rejetée”. The period runs from receipt of the complaint; if documents are supplied later, the provision gives importance to the receipt of those documents. Keep the postal tracking, delivery confirmation, online submission receipt and a PDF of every attachment.
A silent rejection is not the same as a successful appeal. It may open the next procedural step, but you still need to know which decision is challenged and which court is competent. Article R. 142-10-1 states that “Le tribunal est saisi par requête remise ou adressée au greffe par lettre recommandée avec avis de réception”. The application must explain the claim and include the documents relied upon, the contested decision and the prior appeal where required. Check the current court instructions and time limit before sending anything, particularly where a medical procedure has generated a substantial debt.
The statutory picture is not limited to the S2 form. Article L. 160-8 describes the protection against the risk and consequences of illness and lists medical and hospital care among the social-protection benefits. That general protection does not erase the conditions for treatment abroad, but it helps frame the dispute: the question is whether the requested care falls within the applicable entitlement and coordination route, not whether a British resident has no protection at all.
Older European case law can be useful for understanding the principle that the competent insurance institution may have to bear qualifying medical costs incurred in another state, but it must not be presented as a complete answer to a post-Brexit UK file. In its decision of 25 May 2004, second civil chamber, appeal no. 02-30.674, the Cour de cassation referred to the obligation of the institution of affiliation to cover costs incurred in another Member State under the rules then applicable. The judgment predates Brexit and its legal context; use it as historical guidance only, alongside the current France-UK rules and the current administrative decision.
More recent first-instance decisions reinforce the importance of prior approval for hospital care. The Tribunal judiciaire de Lille, RG no. 25/01767, is reported as addressing planned hospital treatment in another European state where prior S2 authorisation was missing. The Tribunal judiciaire de Mont-de-Marsan, RG no. 24/00559, likewise concerns the refusal of hospital costs where prior authorisation was required. Those decisions do not decide every British resident’s case, but they show the financial risk of treating prior approval as an administrative formality.
When preparing a court file, organise the evidence in the order a judge or appeal body will need to read it. Put the notification first, then proof of affiliation or S1 registration, the medical referral, the UK provider’s public-status and acceptance evidence, the S2 request, the decision, the CRA appeal, proof of receipt, invoices and payment records. Add a short chronology with dates. Mark documents that are in English and provide a reliable French translation where the institution or court requires one. Explain every acronym at first use: CPAM, CNSE, CRA, S1, S2, GHIC and EHIC should not be left for the reader to decode.
Finally, do not let the existence of a UK hospital appointment create a false sense that funding is settled. A booking is evidence that treatment is planned; it is not evidence that the competent institution has authorised payment. Conversely, a refusal based on the wrong route may be challengeable if the file proves the correct competent state, the public provider, the medical necessity and the timing. The safest approach is to request a written route decision before committing money, protect the two-month administrative deadlines, and obtain tailored advice promptly if treatment is urgent or the projected cost is high.
Conclusion
A British resident in France may be able to use an S2 for planned treatment in the United Kingdom, but the answer begins with the healthcare system responsible for the person, not with the passport or the hospital’s location. A French-insured patient will usually need to build a prior-authorisation file through the French health-insurance route. An S1 holder must also involve the UK institution responsible for the S1 and obtain a clear answer about the competent payer. GHIC and EHIC rules concern temporary necessary care and should not be used as a substitute for planned-treatment authorisation.
The decisive practical safeguards are simple but time-sensitive: identify the competent institution, confirm that the UK provider is within the public route, request S2 before treatment, obtain the decision in writing, and preserve proof of every submission and cost. If the request or reimbursement is refused, challenge the stated reason through the correct prior appeal and monitor the two-month deadlines. A careful file can turn a vague post-Brexit refusal into a specific dispute about affiliation, medical criteria, provider status or calculation, each of which can then be answered with the right evidence.
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