Most Japanese hospitals have installed wireless LAN. It is currently not only used between PCs and Hospital Information System (HIS) servers, but increasingly for medical devices. Communication between medical devices and HIS servers enables monitoring of how well the devices are working, the exchange of data, and the distribution of instructions input by physicians. Wireless communication has been used in medical telemetry systems for decades in Japan, with the 400MHz frequency band used for signal transmission. Wireless voice communication by the in-house personal handy-phone system (PHS) has also long been used in Japanese nurse call systems. Due to the termination of the public communication service of PHS in 2023, such nurse call systems need to be replaced. Wireless LAN with Voice over IP (VoIP) technology is a strong candidate to be the next wireless communication system for use in nurse call systems. Wireless communication, if implemented properly, is effective for sharing patient information and raising patient safety. However, there are problems with the management of wireless communication systems, and more can be expected to arise in the future. When nurse call systems begin to use wireless LAN, the management of wireless communication may become much more problematic as the volume of data explosively increases. In this paper, we introduce two sets of Japanese guidelines that were promulgated to ensure the safe and effective use of wireless communication in Japanese hospitals.