This article argues that the medical record is an important focus for sociological research. In medical work, the modern patient's body that Foucault has so aptly described is produced through embodied, materially heterogeneous work, and the medical record plays a crucial role in this production. It does not simply represent this body's history and geography; it is a central element in the material rewriting of these. Simultaneously, the record fulfills a core role in the production of a body politic. As the record is involved in the performance of the patient's body, it is also involved in the performance of the clinic in which that body comes to life. Finally, we argue that different records and different practices of reading and writing are intertwined with the production of different patient's bodies, bodies politic, and bodies of knowledge. As organizational infrastructure, the medical record affords the interplay and coordination of divergent worlds. Seen as a site where multiple stories about patients and organizations are at stake, including the interoperability between these stories, the medical record becomes highly relevant both analytically and politically.