Before you start

City registration and a national register number
A Belgian bank account for reimbursements
S1 or E104 form from your previous EU health insurer, if you have one
Employment or self-employment status, which determines how contributions are collected

Step-by-step

1
Choose a ziekenfonds and join
CM, Solidaris, the liberal and neutral funds, the independent funds such as Partenamut and Helan, or the free public fund HZIV/CAAMI. Statutory cover is identical everywhere; they differ on complementary benefits, service and the small monthly contribution. Nobody enrols you.
In personWho: YouWeek 1–3
2
Hand over your S1 or E104 if you were insured in the EU
These forms carry prior cover across and prevent a fund applying a waiting period before entitlement begins. Ask your old insurer for the form before you leave — obtaining it afterwards is much slower.
In personWho: You
3
Register a global medical file (globaal medisch dossier) with one GP
Nominating a single GP to hold your GMD raises the reimbursement on GP consultations substantially and gives you a doctor holding your whole record. It costs you nothing — the fund pays the GP an annual fee for keeping it — and it is the highest-return few minutes in Belgian healthcare.
In personWho: YouFirst GP visit
4
Check whether a specialist is geconventioneerd
Doctors who have signed the national fee agreement charge the official tariff; those who have not can add supplements that your reimbursement does not cover. The proportion varies by speciality and region, and it is published — ask when booking rather than at the desk afterwards.
OnlineWho: You
5
Take hospitalisation insurance before you need it
Statutory cover handles most hospital costs, but a private single room can carry very large room and fee supplements. Hospitalisation insurance via your ziekenfonds, an insurer or your employer is the standard Belgian answer and is far cheaper taken in advance.
OnlineWho: You
6
Use 1733 out of hours instead of the emergency department
Evenings, weekends and public holidays, 1733 routes you to the on-call GP service. It is free, it is the intended route, and it avoids a long wait and a bigger bill in an emergency department for something a GP can handle.
OnlineWho: You

Documents you’ll need

eID and national register number
Belgian bank account details
S1 or E104 from a previous EU insurer
Employment contract or self-employed social insurance affiliation
Vaccination records for children entering Flemish schools

Things most newcomers don’t know

Compulsory does not mean automatic — you have to join a fund yourself.

Your employer registers you for social security, which funds the system, but the ziekenfonds that actually reimburses you is a separate membership you take out. Until you have, you carry the full cost of treatment. Newcomers from countries with a national health service, or where the employer arranges cover, routinely spend their first weeks in Belgium uninsured without realising it.

Source: RIZIV/INAMI

The globaal medisch dossier is free and raises your GP reimbursement immediately.

Nominating one GP to hold your GMD increases the refund rate on GP consultations, improves continuity because that doctor holds your full record, and costs you nothing because the fund pays the GP for maintaining it. It also makes out-of-hours and specialist referrals smoother. It is the cheapest optimisation in the Belgian system and a large share of foreign residents never hear of it.

Source: RIZIV/INAMI

Hospital supplements, not the treatment, are what makes a Belgian hospital stay expensive.

Statutory insurance covers the medical act at the official rate. What it does not absorb is room supplements and, in a private single room, the fee supplements doctors are permitted to charge on top — which can multiply the bill several times over. This is precisely what hospitalisation insurance exists for, it is inexpensive taken in advance, and many Belgian employers include it. Ask at hiring, not at admission.

Source: RIZIV/INAMI

Flanders runs its own long-term care contribution on top of the federal system.

The Flemish social protection scheme (Vlaamse sociale bescherming) levies an annual care contribution on adults registered in Flanders and funds care budgets for long-term dependency and disability. It is a Flemish Community matter, so residents of Brussels are treated differently from residents of Antwerp. It is small, it is separate from your ziekenfonds contribution, and arrivals often mistake the bill for an error.

Source: Flemish Community

Common mistakes to avoid

Assuming your employer or the city enrols you in a health fund.
Leaving the S1 or E104 behind and being told a waiting period applies.
Never registering a global medical file and overpaying on every GP visit.
Booking a non-agreement specialist without asking about supplements.
Taking hospitalisation insurance only after a hospital stay is already scheduled.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.