Judgment of the Court (Fourth Chamber) of 23 September 2020.#WO v Vas Megyei Kormányhivatal.#Request for a preliminary ruling from the Szombathelyi Közigazgatási és Munkaügyi Bíróság.#Reference for a preliminary ruling – Social security – Sickness insurance – Regulation (EC) No 883/2004 – Article 20 – Scheduled treatment – Prior authorisation – Mandatory grant – Conditions – Insured person prevented from applying for prior authorisation – Regulation (EC) No 987/2009 – Article 26 – Assumption of costs of scheduled treatment incurred by the insured person – Procedure for reimbursement – Directive 2011/24/EU – Cross-border healthcare – Article 8(1) – Healthcare that may be subject to prior authorisation – Principle of proportionality – Article 9(3) – Processing of applications for cross-border healthcare – Factors to be taken into account – Reasonable time – Freedom to provide services