The present invention relates to medical device programming assemblies, systems and methods for programming a medical treatment parameter on a medical device, via a programming key. The programming key may be adapted to mate with the medical device which comprises a programmable, non-transitory, computer readable storage device. The storage device comprises a data connector which is configured to mate with a corresponding data connector on the medical device. The storage device may be affixed to a fastener coupling configured to mate with a corresponding coupling on the medical device when the data connector is brought into proximity with the corresponding data connector on the medical device. The programming key is configured to occupy a space formed within the medical device when the data connector and fastener coupling are mated with the corresponding data connector and fastener coupling of the medical device.