Health data are sensitive data and must therefore be protected from unauthorised access. However, exchanging individual patient information is crucial for coordinating treatment between different medical professions and for the statutory health insurance schemes. Digitalisation of health data will facilitate all these processes. To promote EU-wide mobility of patients, the European Commission has proposed the establishment of a European Health Data Space. It is intended to trigger technological development in the member states, given that to date digitalisation has been used to different extents throughout the union. It is not guaranteed that patients in all member states will have access to their health data and thus be able to receive treatment or fill prescriptions within the single market. At the same time, the common experiences in the SARS-CoV2-pandemic made clear that there is a vital need for using patient data as a tool for monitoring health threats and for improving the coordination of both preparedness and response measures in times of health crisis.