Devices, systems, and techniques for adjusting posture state definitions used to determine a posture state of a patient are described. In one example, a system may include an external programmer that includes a user interface configured to present an indication of a first posture state determined from the data representative of the patient posture during the period of time and a set of posture state definitions that at least partially define a plurality of posture states. The external programmer may also include a processor configured to receive an adjustment input from a user that requests an adjustment to the set of posture state definitions and obtain a second posture state, the second posture state determined from the data representative of the patient posture during the period of time and the adjusted set of posture state definitions. The user interface presents an indication of the second posture state.