LAMal vs CMU: How to Choose Health Insurance as a Cross-Border Worker in Switzerland

Under the Agreement on the Free Movement of Persons (AFMP) between Switzerland and the EU — applied in conjunction with Regulation (EC) No 883/2004 on the coordination of social security systems — cross-border workers (frontaliers) residing in France are subject to the droit d'option. Within 3 months of starting a Swiss employment contract, you must choose between:

• LAMal — Swiss compulsory health insurance (Loi fédérale sur l'assurance-maladie, RS 832.10)

• CMU/PUMa — French universal health coverage under the Protection Universelle Maladie (Article L160-1 du Code de la sécurité sociale)

This choice is irrevocable for the duration of your cross-border employment. You can only switch if you experience a qualifying life event (e.g., loss of Swiss employment, retirement) — and because the applicable social-security system also hinges on how much you telework from France (the 49.9% ceiling), frontaliers who work from home keep count of their days with a free telework day counter for frontaliers.

Under LAMal, you pay a fixed monthly premium to a Swiss insurer (e.g., Helsana, CSS, Assura). Key characteristics:

• Premiums are not income-based — they depend on your age, canton of work, and chosen franchise (deductible from CHF 300 to CHF 2,500/year)

• You are covered in both Switzerland and France for medical treatment

• Access to the Swiss healthcare network, which ranks among the best in Europe (OECD Health at a Glance 2025)

• Average monthly premium for a frontalier in Geneva: approximately CHF 450–600 (2026 rates, OFSP data)

• Complementary insurance (complémentaire) is optional but recommended for dental, optical, and alternative medicine

Under CMU (now integrated into PUMa), you join the French Sécurité sociale system. Key characteristics:

• Contributions are income-based: 8% of your net fiscal income (revenu fiscal de référence), after a standard allowance — set by Article D380-1 du Code de la sécurité sociale

• Coverage is limited to France only (you need a separate arrangement for care in Switzerland). Cross-border workers should also be aware of the upcoming EHIC 2026 reform that changes European health coverage rules

• You benefit from the full French reimbursement system (carte Vitale, tiers payant)

• You can add a mutuelle (complementary insurance) for better coverage

• If your Swiss salary is high (above ~CHF 80,000), CMU contributions can exceed CHF 500/month — potentially more expensive than LAMal

Cost structure: LAMal = fixed premium (age/canton-based); CMU = 8% of income (progressive)

Coverage territory: LAMal = Switzerland + France; CMU = France only

Family: LAMal = each family member pays a separate premium; CMU = dependents covered at no extra cost

Deductible: LAMal = CHF 300–2,500 franchise; CMU = standard French co-payments (ticket modérateur)

Switching: Both are irrevocable during cross-border employment

Best for low earners: CMU is usually cheaper below ~CHF 55,000 gross salary

Best for high earners: LAMal is usually cheaper above ~CHF 70,000 gross salary

Best for families: CMU often wins due to free dependent coverage

Step 1 — Calculate your projected CMU contribution: take your net fiscal income and apply the 8% rate after the allowance (around €10,000 in 2026).

Step 2 — Get LAMal quotes from 3–4 Swiss insurers for your canton and age. Use the OFSP premium comparison tool (priminfo.admin.ch).

Step 3 — Factor in family: if you have a non-working spouse and children, CMU may save thousands per year.

Step 4 — Consider where you seek medical care: if you prefer Swiss doctors and hospitals, LAMal gives direct access.

Step 5 — Consult a specialist. The AdminLanding Cross-Border Pack (€29) includes a personalised LAMal vs CMU cost simulation, step-by-step affiliation guidance, and document templates — designed specifically for France-Switzerland frontaliers.

Step 6 — When you finally sit down to affiliate at CPAM or Ameli, Guide: Démarches en France annotates every field on ameli.fr — in English or French — explaining what each box expects and which documents to attach. Available as a Chrome extension or Android app on Google Play.

• 3-month deadline: You must exercise your droit d'option within 3 months of your first Swiss employment contract. If you miss it, you are automatically enrolled in LAMal.

• For LAMal: Contact a Swiss health insurer directly. You will receive a certificate of coverage to present to your employer.

• For CMU: File a request with your local CPAM (Caisse Primaire d'Assurance Maladie) using the formulaire de choix du système d'assurance maladie applicable. Attach your Swiss work contract and proof of French residence.

• CNTFS: The Centre National des Travailleurs Frontaliers en Suisse (based in Strasbourg) processes CMU affiliations for frontaliers. Processing times: 4–8 weeks.

• Missing the 3-month window: You lose the right to choose and default to LAMal — no exceptions.

• Ignoring family impact: A single person's calculation changes dramatically with dependents.

• Forgetting complementary insurance: Neither LAMal nor CMU covers 100%. Budget for a mutuelle or complémentaire.

• Not comparing cantons: LAMal premiums vary significantly between Geneva, Vaud, and Basel.

• Confusing CMU-C with frontalier CMU: CMU-C (now CSS) is means-tested social assistance — different from the frontalier regime.