A system for identifying an attribute of an implanted medical device, such as an access port is disclosed. In one embodiment, the identification system comprises a marker included with the implanted medical device, wherein the marker relates to an attribute of the implanted medical device. An external detection device is also included, comprising a signal source that emits an incident electromagnetic signal for impingement on the marker of the implanted medical device, a detector that detects a return signal from the marker resulting from impingement of the incident electromagnetic signal, and a user interface for conveying information relating to the attribute based on detection of the return signal. In the case of an implantable access port, for instance, the described system enables information, such as the ability of the port to withstand power injection of fluids therethrough, to be ascertained even after the port has been subcutaneously implanted within the patient.