The service unit (30) has an interface for receiving a data from a personal medical device (10), and an analysis unit for analyzing a data received from the personal medical device. The analysis unit is connected to the interface, and an aftercare appointment determination unit is indirectly connected to the analysis unit and/or the interface. The aftercare appointment determination unit determines an aftercare appointment based on the data received from the personal medical device and based on multiple user inputs received from a user input unit (40). An independent claim is also included for a method for determining an aftercare appointment for a patient.