In a method and system for identifying an implantable medical device (IMD), which is arranged to be disposed in a body, by conducting a telemetry communication session between the implantable medical device and an external programmer device, cardiac data are registered from a point on the body of a patient having an IMD with which a communication session is to be established. The registered cardiac data are compared with one or more sets of intracardiac data pertaining to patients having an IMD implanted and to identify the IMD with which the communication session is to be conducted by the performed comparison.