The Norwegian healthcare system is characterized by fragmentation and specialization, and better coordination has been a core objective in policy reforms and among academics. Based on a large scoping review and in-depth analysis of twenty-five studies connected to the Coordination Reform, this article describes and categorizes elements that promotes and challenge attempts of coordination across professional and organizational boarders in the healthcare system. The results show that challenges of coordination relates to the lack of collective venues and local guidelines for coordination, as well as the lack of knowledge about each other's professional practice. Successful coordination is described in the context of face-to-face relationship, teamwork, as well as interaction, characterized by equivalence and mutual knowledge. Based on the result, and a system-theoretical understanding of the health care system as functionally differentiated, this article presents a typology that illustrates four ideal types of coordination. The results imply that one can question coordination measures that emphasize rationalization and effectivization without social interaction between different health professions.