The development of information and communication technology in the 21st century and the entry into an ultra-aging society promoted a fundamental shift in the medical service paradigm, which brought about rapid growth in the mobile healthcare field. This study empirically analyzed the effects of reliability, privacy, health concern, usefulness, and ease, which are characteristic factors of mobile healthcare service apps, on consumers' intention to continue using, and verified the mediating effect of immersion and the moderating effect of perceived risk together. For empirical analysis, an online survey was conducted on health-related app users, and the final collected data of 250 people were analyzed using SPSS 23.0 and AMOS 23.0, and the results are as follows. First, privacy and usefulness had a positive (+) effect on immersion, and reliability, usefulness, ease of use, and immersion had a positive (+) effect on continuous use intention. Second, immersion showed a complete mediating effect between privacy and continuous use intention, and a partial mediating effect between usefulness and continuous use intention. Third, perceived risk showed a negative (-) moderating effect in the relationship between health concern and immersion. Therefore, this study suggests that enhancing user immersion through securing privacy and providing high usefulness is a path to increase the intention to continue using, and raises the need to effectively induce users with high health interest to use services by improving reliability and ease and lowering perceived risk.