Judgment of the Court (Seventh Chamber) of 15 June 2023.#Thermalhotel Fontana Hotelbetriebsgesellschaft m.b.H. v Bezirkshauptmannschaft Südoststeiermark.#Request for a preliminary ruling from the Verwaltungsgerichtshof.#Reference for a preliminary ruling – Social security – Regulation (EC) No 883/2004 – Article 3(1)(a) – Concept of ‘sickness benefits’ – Scope – Freedom of movement for workers – Article 45 TFEU – Regulation (EC) No 492/2011 – Article 7(2) – Social advantages – Difference in treatment – Justifications – COVID-19 – Isolation of employees ordered by the national health authority – Compensation of those employees by the employer – Reimbursement of the employer by the competent authority – Exclusion of frontier workers required to isolate under a measure taken by the authority of their State of residence.#Case C-411/22.