About Phoenix Indian Medical Center (PIMC) PIMC provides direct health care services to 156,815 patients. The Tribes that comprise the Phoenix Service Unit are, The Fort McDowell Yavapai Nation, the Salt River Pima-Maricopa Indian Community, and the San Lucy District of the Tohono O'odham Nation, the Tonto Apache Tribe, the Yavapai-Apache Indian Tribe, and the Yavapai-Prescott Indian Tribe..