According to the legal acts of the European Union (EU), the person insured by social insurance in one EU Member State but residing in another EU Member State, is entitled to healthcare services in the country of residence. The competent institution of the EU Member State, where the person was insured by social insurance, is responsible for reimbursement of such expenses. In order to exercise this right, the person has to register document S1 issued by his competent institution in the institution of place of residence in the country of residence.
The functions of the competent institution in Lithuania are performed by territorial health insurance fund (THIF).
The countries, where Lithuanian insured may get healthcare services covered from the budget of Compulsory Health Insurance Fund (CHIF) are: EU Member States, European Economic Area countries, Switzerland, and the United Kingdom.
Document S1 issued by the THIF certifies the right of the person insured by compulsory health insurance in the Republic of Lithuania but residing in another EU Member State, to receive healthcare services in the country of residence, the expenses whereof would be reimbursed from the CHIF budget.
Document S1 has replaced certificates E 106, E 109, E 120 or E 121.