Remember; NCS/EMG combo could spell electrodiagnostic test. One of the tests your PM provider might administer is actually a combination of tests called electrodiagnostic (EDX) testing. Definition: If the provider performs a nerve conduction study (NCS) along with an electromyography (EMG), it's likely an EDX test. The challenge for coders comes, of course, when it's time to file the claim. [...]