The geography of Milton Santos has been incorporated into the territorial planning of the Unique Health System (SUS) in Brazil. The conceptual proposal based on the concept of "used territory" is still a reference for the definition of SUS gateway and the modeling of their care networks. However, the legal instruments of territorial planning still require theoretical foundation and methodology further. There is the generalization of its use, but lacks reflection and criticism. Therefore, the first objective of this paper is to remake the theoretical path of "used territory" concept and as proposed originally by Milton Santos. Therefore, the first objective of this paper is to remake the path theoretical of "territory used" concept as originally proposed by Milton Santos. The second goal is to understand how this concept has been used in effective proposals of territorial planning of SUS. The methodology is based on a theoretical and descriptive work and a theoretical-critical exercise. The results indicated mistakes in appropriation of concept of "used territory" by health in Brazil and the need to deepen the discussion, especially in dimension of totality that is inherent.38291320