C-743/23A v GKV-Spitzenverband

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Reference for a preliminary ruling – Agreement between the European Community and its Member States, of the one part, and the Swiss Confederation, of the other, on the free movement of persons – Migrant workers – Social security – Applicable legislation – Regulation (EC) No 883/2004 – Article 11 – Article 13(1) – Regulation (EC) No 987/2009 – Article 14(8) – Worker pursuing an activity as an employed person in the territory of several States, including a Member State, the Swiss Confederation and third countries – Concept of ‘substantial part of the activity’ – Taking account of the activity pursued in third countries.

Interprets