A system and method for post-processing of sensing data generated by a medical device that includes transmitting a plurality of stored sensing data generated by a medical device to an access device, the stored sensing data including sensed atrial events and sensed ventricular events. The access device determines, in response to the transmitted data, instances where the medical device identified a cardiac event being detected in response to the sensing data, and verifies, in response to the transmitted data, whether the determined instances should have been identified by the medical device as a cardiac event being detected.