Judgment of the Court (Third Chamber) of 21 December 2023.#ZQ v Medizinischer Dienst der Krankenversicherung Nordrhein, Körperschaft des öffentlichen Rechts.#Request for a preliminary ruling from the Bundesarbeitsgericht.#Reference for a preliminary ruling – Protection of natural persons with regard to the processing of personal data – Regulation (EU) 2016/679 – Article 6(1) – Conditions for lawful processing – Article 9(1) to (3) – Processing of special categories of data – Data concerning health – Assessment of an employee’s working capacity – Health insurance medical service processing data concerning the health of its own employees – Conditions for such processing and whether permissible – Article 82(1) – Right to compensation and liability – Compensation for non-material damage – Compensatory function – Impact of negligence on the part of the data controller.#Case C-667/21.