A wearable cardioverter defibrillator (WCD) system includes a processor, a memory, a wireless communication module (DWCM), and an NFC tag (191) that stores information for how an accessing device (141) may access the DWCM wirelessly. An accessing device (141) such as a defibrillator configurator with an NFC reader may read the NFC tag (191) of the WCD system, if it has adequate permission to do so. Upon so reading, the accessing device (141) will know how to address the DWCM wirelessly, and thus install or update configuration data, software updates, or request memory downloads from operations. The use of the NFC tag (191) requires close proximity, which hampers both inadvertently programming the wrong WCD system, plus a WCD system being attacked maliciously.
