Introduction

When you first arrive in France, everyone asks you, "What is your sécu number?" — the university's student health insurance department, your employer, CAF (the benefits office), and even your first visit to a family doctor. You search through all your documents, either finding nothing or discovering that you have a number starting with 7 or 8, rather than the more common 1 or 2. Don't panic: that's your NIA, the temporary social security number, which is normal for newcomers to France.

The confusion between NIA, NIR, Ameli accounts, and Carte Vitale wastes thousands of new immigrants several months each year. No social security number = no reimbursements, potential issues with pay slips, CAF applications getting stuck, and inability to purchase supplementary health insurance. This 2026 guide clarifies every step, taking into account the actual processing times by CPAM.

Difference Between NIA and NIR

• NIR (National Identification Number) is the official social security number, consisting of 13 digits + 2 check digits. It starts with 1 for males and 2 for females, followed by the year and month of birth, and the province/INSEE code. Lifetime use.
• NIA (Temporary Identification Number) is a temporary number issued by CPAM while INSEE is still verifying your foreign birth certificate. It starts with 7 or 8, and in most cases is equivalent to the official NIR: it can be used for reimbursements, pay slips, CAF, and Ameli accounts.

Key Point: NIA is not a "second-class" number; it allows you to:

• Receive reimbursements from CPAM
• Ensure your employer correctly registers you in the social security declaration (DSN)
• Open an online account on ameli.fr
• Apply for CSS (Complementary Health Insurance) or purchase commercial health insurance (mutuelle)
• Apply for AME (State Medical Assistance) — note: AME uses a different file and does not require NIA
• Apply for APL housing assistance, employment benefits, school allowances, etc., at CAF

The only thing NIA cannot do: Obtain a Carte Vitale health insurance card. You need to switch to a formal NIR to do that. The average waiting time from NIA to NIR in 2026 is 2–6 months, and in the Paris region (CPAM 75/92/93/94) it can sometimes take up to 9 months.

How to Obtain NIA After Arriving in France: Three Paths

1. You Have a Formal Job (salarié)

The fastest way. Your employer will automatically register you through the first DSN (social security declaration), and you can usually receive your NIA within 2–6 weeks after your first pay slip. Remind HR to submit your: translated birth certificate + passport + residence permit or récépissé.

2. You Are a Student

Since 2018, French and EU students are automatically enrolled in health insurance, but non-EU foreign students must register themselves on etudiant-etranger.ameli.fr (dedicated portal) by uploading: passport, enrollment certificate, translated birth certificate, and French RIB. NIA is usually issued within 4–12 weeks. Until you receive it, you will need to pay out of pocket for medical care, but you can claim reimbursement once you have your NIA.

3. You Are Unemployed, a Spouse, or a Self-Employed Worker (auto-entrepreneur)

You need to make an appointment at your local CPAM (online or in-person) and submit the "first account opening" file. Required documents: form S1106 (health insurance account application), passport, residence permit, translated birth certificate, proof of address, and crucially — proof of stable residence for at least 3 months (as required by the PUMa system). Processing time: 2–6 months.

2026 Actual Cases:

• Chen, a Chinese engineer at a large company in Lyon, started in March 2026 with a talent passport: saw NIA on the May pay slip (2 months). Received formal NIR and card notification in August (5 months).
• Houria, an Algerian PhD student in Lille, signed her PhD contract in September 2025: received NIA in October, NIR in March 2026, and Carte Vitale in April.
• Carla, a Brazilian whose husband is French, returned to France after many years in Brazil and was unemployed: submitted her file in January 2026, received NIA in May (4 months), and is still waiting for NIR in September.
• Jun, a Vietnamese master's student in Toulouse: submitted on etudiant-etranger.ameli.fr on September 15, 2025, and received NIA on December 8 (12 weeks).
• Mamadou, from Senegal, started working as a delivery freelancer in February 2026: first with URSSAF then CPAM, received NIA in July (5 months, delayed by birth certificate translation).

Essential Document Checklist

CPAM typically requires:

• Passport (identity page + visa or residence)
• Valid residence permit or récépissé
• Complete birth certificate, translated into French by a court-certified translator, or in multilingual European format (most European countries have signed the CIEC No. 16 convention). Birth certificates from mainland China, Morocco, Algeria, Senegal, Vietnam, and Brazil must be translated (costing €50–80 each, delivered in 5–10 days)
• Marriage certificate (if married), also needs translation
• Proof of address (EDF/internet bill or accommodation declaration) dated within the last 3 months
• French RIB (accounts like Nickel, N26, etc. are acceptable)
• Form S1106 or S1107 (depending on the situation)
• Students: enrollment certificate for the current year

Translation Practical Tips: Birth certificates from China (often abbreviated by civil affairs bureaus), Mali, Senegal, and Congo often require additional certification through the French consulate abroad. It's advisable to prepare these 1–3 months before departure.

No NIA, No Progress

Without a social security number (even a temporary one), you may face the following issues:

• Employment: Employers cannot correctly declare you to URSSAF, and some contracts (temporary work, paid internships) cannot start
• Medical reimbursements: General practitioner €30, specialist €80–250, full price for medications. Delays (over a year) may sometimes prevent retroactive claims
• CAF Benefits: Without NIA, you cannot receive APL, employment benefits, or housing assistance
• Commercial Health Insurance: Most mutuelles refuse to insure those without a social security number
• CSS (Complementary Health Insurance): You cannot apply, and even if eligible, you won't benefit from full third-party payment (tiers payant)
• Student or consumer loans: Some banks require a social security number in addition to a residence permit
• Retirement: Work years not registered under a formal NIR will not count towards retirement quarters in the future

A typical example: Linh, a Vietnamese student, did a 6-month paid internship earning €800 per month without obtaining a social security number. Result: €340 in medical expenses went unreimbursed, retirement quarters were not counted, and CAF application was rejected. If she had received her NIA in the first month of her internship, she could have saved €600 and avoided 4 months of hassle.

Carte Vitale: Next Steps

Once you receive your formal NIR (not starting with 7/8), Ameli will send you an email or letter inviting you to apply for Carte Vitale. Starting in 2024, you can do this through:

• Carte Vitale mobile app (FranceConnect+ or Ameli identity verification) — electronic version, recognized by doctors with the appropriate equipment
• ameli.fr → "Mes démarches" → "Commander ma Carte Vitale" — physical card, mailed to your home in 2–4 weeks
• In-person appointment at CPAM

Required materials: compliant identity photo (e-photo code) + scanned identity document. First application is free, and it becomes invalid if you leave France or pass away.

Summary in One Image

• NIA = Temporary Number, starting with 7 or 8; NIR = Official Number
• NIA can be used for everything except obtaining Carte Vitale
• Duration: 2–6 months, the employer path is the fastest
• Key documents: translated birth certificate, residence permit, proof of address, RIB
• Without NIA: reimbursements, CAF, and mutuelle are all blocked
• Carte Vitale: must wait for formal NIR

On Pionra

On Pionra, the Chinese Community, Moroccan Community, and Algerian Community share trusted court-certified translators, actual processing times at various CPAM offices (Bobigny, Lyon, Marseille, etc.), and tips for expediting applications. The Vietnam, Senegal, Portugal, and Brazil communities also have topics on converting NIA to NIR. Lists of Chinese/multilingual doctors and mutuelles without extra premiums can be found at /fr/annuaire.

Frequently Asked Questions

My employer is asking for my social security number, but I haven't received it yet. What should I do?

This is normal. Provide your passport, residence permit, and translated birth certificate to HR, and they will register you through DSN; NIA will appear on your first few pay slips. During this time, internally mark "NIA en cours" (NIA application in progress), and you are a legally employed worker.

I see NIA on my pay slip; can I use it immediately?

Yes. Use this number + your date of birth to register an account on ameli.fr, and wait for the temporary password to be mailed to your home within 7–10 days. After that, you can: declare a family doctor (médecin traitant), receive reimbursements, apply for CSS, and report the number to CAF.

How long do I have to wait for the formal NIR?

In 2026, most cases take 2–6 months. In the Paris region (CPAM 75, 92, 93, 94), it usually takes 5–9 months, and if INSEE is delayed by birth certificate translation or requires additional notarization, it may take longer. If you haven't heard anything for 3 months, you can follow up via Ameli's internal messaging or in person.

Can I use my Chinese/Vietnamese/Senegalese birth certificate directly?

No, exceptions are very rare. Birth certificates from mainland China, Vietnam, Senegal, Algeria, Morocco, Tunisia, Brazil, India, Cameroon, Ivory Coast, Mali, Congo must be translated by a court-certified translator registered with the French Court of Appeals, costing €50–80 each, typically delivered in 5–10 days. Official inquiry: annuaire-traducteurs-assermentes.justice.gouv.fr.

What should I do if I lost my Ameli temporary password letter?

Click "Code oublié" on ameli.fr, log in using FranceConnect (passport or French digital identity), or request a new password to be mailed (5–7 days). You can also make an appointment at CPAM for in-person assistance; staff can reset your account in 5 minutes.