ECJ 14 October 2010, case C-345/09 (J.A. van Delft et al. – v – College van Zorgverzekeringen), Social insurance
Neither Regulation 1408/71 nor Article 21 TFEU preclude national legislation under which recipients of a pension, who reside in another Member State in which they are entitled to sickness benefits in kind provided by that Member State, must pay, in the form of a deduction from their pension, a contribution in respect of those benefits even if they are not registered with the competent institution of their Member State of residence. However, Article 21 TFEU does preclude national legislation in so far as it induces or provides for an unjustified difference of treatment between residents and non-residents as regards ensuring the continuity of the overall protection against the risk of sickness enjoyed by them under insurance contracts concluded before the entry into force of that legislation.
European Court of Justice (ECJ), 2010-10-14
