The S1 form: healthcare in Bulgaria on EU insurance

Healthcare · Last reviewed: 2026-08-26

The question S1 answers: not "temporary" but "resident"

The two basic documents of EU health coordination address two different life situations. The EHIC (European Health Insurance Card) is the document of TEMPORARY stays: holidays, short business trips, student exchanges — with the card you receive medically necessary care in the country of stay. The S1 is the document of SETTLING: the centre of your life is now Bulgaria, but the system collecting your health contributions (or paying your pension) is another member state. Trying to live for years "as a resident" on an EHIC is a common and costly mistake — the card covers only medically necessary care and builds no regime of planned, continuous care; the resident switches to full coverage by registering an S1.

The S1's legal foundation is Regulation (EC) No 883/2004 on the coordination of social security systems and its implementing regulation (987/2009). Keep it distinct from its siblings: A1 certifies which country receives your CONTRIBUTIONS (posted workers), S2 is authorisation to travel for planned TREATMENT, the EHIC is for temporary stays; S1 is the registration of health COVERAGE in the country of residence. The S1 replaced the old paper forms E106, E109, E120 and E121 — if you meet those codes in old correspondence, today's equivalent is the S1. This whole framework was verified against the EU's official pages on 26 August 2026; always confirm current detail on the official page.

Who uses S1: four typical profiles

The question behind the S1 is always the same: "which country's fund is responsible for this person's health?" The coordination regulation answers by profile. In the Bulgarian context four profiles dominate: PENSIONERS drawing a pension from another member state who settle in Bulgaria (the responsible country is, as a rule, the one paying the pension); employees POSTED temporarily to Bulgaria by their employer (the contribution country does not change — the S1 is obtained together with the A1); family members of CROSS-BORDER workers who work in one country and live in another; and FAMILY MEMBERS of an insured person living in Bulgaria. In every profile the S1 is issued by the institution of the country the insurance belongs to.

Order matters: first the insuring country, then Bulgaria

The S1 process runs in two countries, in two steps, and the order never changes. FIRST you apply to the institution of the country where you are insured and have the S1 issued — for pensioners, the health institution of the pension-paying country; for workers, the institution receiving the employer's contributions. THEN you hand the form to the NHIF's regional fund (RZOK) in Bulgaria and register it. Once registration completes, the NHIF takes you into the system: you choose a GP, the referral chain applies to you under the same rules, and you enter the hospital and prescription order like a local insured person. The backstage accounting — Bulgaria recovering its outlays from your insuring country — is not your concern; the face you see is the NHIF system.

1. 1

   Clarify your responsible country

   If a pensioner: the country granting the pension. If posted: the country receiving contributions (your A1 already says so). If you draw pensions from several countries, the responsibility rules become special — ask your institution rather than guessing.
2. 2

   Request the S1 from your insuring institution

   Apply before moving to Bulgaria or immediately after. The institution issues the form in your name and, if needed, your family members' names. Check whom it covers before accepting it.
3. 3

   Register it with the RZOK in Bulgaria

   Apply to the NHIF regional fund for your residence address with your ID, residence document and the S1. After registration, confirm your status in the system is active.
4. 4

   Choose a GP

   Registration alone opens no doctor's door; the entrance to the NHIF order is the GP. The selection procedure is in our GP article — do it in the same week as the S1 registration.
5. 5

   Report changes to both sides

   A stopped pension, starting work, leaving the country, divorce — such changes touch the S1's foundation. Report them both to your insuring country's institution and to the NHIF — failing to report means costs claimed back later.

What happens to the EHIC when you hold an S1?

Registering in Bulgaria with an S1 does not take you out of the EHIC world — rather, it clarifies which country's card regime you follow. For trips to other EU countries you still use an EHIC for temporary care; which country issues your card depends on your profile — it may be your insuring country or, in some profiles, your country of residence. Because this detail varies by profile and gets updated, the only correct behaviour is: once your S1 registration completes, ask both the NHIF and your insuring country's institution, "which institution issues my EHIC from now on?" — and get the answer in writing. Using the EHIC INSIDE Bulgaria is described in its own article.

S1 and NHIF contributions: the double-payment trap

The S1's logic is that your insuring country bears the COST of your health; therefore, while registered with an S1 you are, as a rule, not also liable for a Bulgarian health contribution for the same coverage — double contributions are exactly what coordination prevents. In practice the topic knots up in two places. First: if you start WORKING in Bulgaria, the situation changes fundamentally — work generally shifts the responsible country to the country of work; your S1 may lapse and you become an ordinary NHIF-insured contributor. Second: if your status shows wrongly in the registers (e.g. the system thinks you owe contributions), the fix runs on documents — which is why your S1 registration printout and RZOK correspondence are archive material. The domestic contribution rules are in our contribution-payment article.

Boundaries for the three reader profiles

For most of this site's Turkish readers the S1 matters tomorrow rather than today: Turkish insurance produces no S1, but anyone who has worked in an EU country over the years and retired from there — like the hundreds of thousands of Turks in Germany, the Netherlands, Austria — enters this article's first profile the day they choose to settle in Bulgaria: German pension + Bulgarian residence = S1 from the German institution + NHIF registration. The same goes for Ukrainian readers: someone insured while working in Poland or Germany who moves to Bulgaria enters the S1 regime; Ukrainian insurance itself is out of scope. In short, the key to the S1 is not the passport but WHERE THE INSURANCE SITS.

There is also a reverse flow worth remembering: people insured in Bulgaria who settle in another EU country — say, someone moving to Greece on a Bulgarian pension — obtain the S1 this time from the NHIF and register it with the new country's institution. The mechanism is symmetrical; the geography of your life and insurance decides which direction you use it in.

Frequent problems and their solutions

• •"I can't find who should issue my S1." The right door is always your INSURING country's institution: for pensions, the health arm of the pension-granting institution; for work, the contribution-collecting institution. The RZOK in Bulgaria CANNOT issue you an S1 — it is only the registering side.
• •"I registered but the system shows me uninsured." Processing can take time; ask the RZOK for written confirmation that the registration is active. If a GP or pharmacy says "you show as uninsured", present the confirmation and have the RZOK resolve it.
• •"My family was left out of coverage." The S1 is issued per person; coverage for your spouse and children is established separately under your insuring country's rules. Name the family members explicitly when requesting the form and verify each registration separately.
• •"I started a job in Bulgaria — now what?" The responsible country has most likely changed. Do not hide it — notify both institutions; otherwise costs paid by the wrong country come knocking later. In the new situation your NHIF contribution runs under Bulgarian rules.
• •"My pension comes from two countries." The responsibility rules become special (factors such as whether you draw a pension from the residence country come into play). In that case trust no general article; request written opinions from both institutions.

Keeping papers in order: the skeleton of your S1 file

The S1 order rests on three parties — the insuring country's institution, the NHIF and you — sharing the same information, and in practice the weakest link is usually scattered paperwork. Build this skeleton: the S1 form itself (plus any translation), the RZOK registration confirmation, the GP registration document, correspondence with your insuring country and copies of your change notifications — all in one folder, in date order. In any dispute between the two countries this folder is your defence; "I did report it" works only with a copy. Note in the same folder which institution issued your EHIC cards and their validity dates.

Timing: before the move or after?

The cheapest improvement to an S1 file is timing. Sorting the form out BEFORE moving to Bulgaria, with your insuring country's institution in person or through its established channels, is always easier than chasing it afterwards from a foreign country by post and phone. The ideal flow: once the move is decided, notify your institution "I am moving my residence to Bulgaria, I need an S1"; receive the form (or its electronic equivalent); in Bulgaria complete first your residence registration and immediately afterwards your RZOK registration. Residence registration and S1 registration feed each other — the RZOK knows you by your address — so squeezing both into the same weeks preserves the whole.

A late start can still be rescued: someone who has lived in Bulgaria for months and still gets by on an EHIC can begin the S1 process today. But delay carries two costs: which regime pays for care received in the meantime can get tangled, and when planned care is needed (a surgery slot, chronic treatment) the registration may not arrive in time. The "I'm healthy anyway" postponement is the most expensive sentence in health systems — registrations are cheap while you are healthy and expensive when you are sick. If you are late, state the situation openly to both institutions when starting: since when you have lived in Bulgaria, what care you received where in the meantime, and from what date you want the registration to run. Open declarations make retroactive fixes easier; withheld information breaks trust at both institutions.

When the S1 ends: status transitions

The S1 is not a permanent status but the certificate of a specific situation; when the situation changes, the certificate ends and a new arrangement takes its place. Typical transitions: a posted worker whose assignment ends either returns home (the S1 closes) or switches to local employment in Bulgaria (becoming an ordinary NHIF insured); a pensioner moving residence to another country rebuilds the S1 chain towards it; if the right in the insuring country (e.g. the pension) stops, the S1's foundation falls. At every transition the task is the same: notify both institutions, obtain the new status's document, archive the old one. Continuing to use the system on a lapsed S1 — even in good faith — can return later as cost-recovery claims.

For those who put down roots in Bulgaria there is also a long-term question: someone who years later moves onto a Bulgarian pension or Bulgarian insured employment may now have Bulgaria as the responsible country, and the cycle reverses — the EU insurance periods accumulated until then count under the aggregation rules in the pension calculation. That separate, large topic is covered in our EU pension-aggregation article; every document in your S1 file will serve you on the day of that calculation.

The relationship with private health insurance

The S1 is the means of joining the public system; it does not compete with private health insurance but stands beside it. Many settled foreigners in Bulgaria add a private policy on top of public coverage — for shorter waits, private hospital comfort, English-language service. The right construction is: the base is always the S1/NHIF registration (the public guarantee for emergencies, admissions and expensive treatment), with the private policy as a comfort layer. Doing the opposite — neglecting the public registration and leaning only on a policy — costs dearly at the first big event the policy excludes. Details on choosing a policy are in our private-health-insurance article.

Language and correspondence: talking to two bureaucracies at once

An S1 file means corresponding with two countries' bureaucracies at once, and the language barrier appears at both ends in different shapes: your insuring country's institution writes in its own language (German, Dutch, French...), the RZOK writes in Bulgarian. This is exactly where the power of standard forms kicks in — the S1 itself has the same structure in every member state and institutions recognise each other's forms without translation; your translation burden is not the forms but the side correspondence. Practical tips: prefer written channels over phone calls (letters archive, calls evaporate); keep Bulgarian applications short and simple, or engage a sworn translator once; keep a dated copy of every submission. The bill for a document lost between two bureaucracies is always charged to the citizen — except the citizen with a copy.

Closing: S1 is a cold name for a form, but the idea behind it is warm — the health security of a person moving within Europe should not reset to zero on moving day. For everyone settling in Bulgaria with insurance in another member state, the right order is four steps: clarify the responsible country → obtain the S1 there → register it with the RZOK → choose a GP. The framework here was verified against the EU's official sources on 26 August 2026; as profile rules get updated, confirm current detail on the official pages and with your institutions before acting. And read this together with its sibling articles in this batch: the EHIC articles map temporary stays, the referral-system article maps the NHIF's daily operation, the A1 article maps the contribution side — the four together close, end to end, the health infrastructure of a life in motion across Europe.

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