Nerve Conduction Studies and Electromyography

Nerve conduction studies (NCS) and electromyography (EMG) are generally covered when performed by appropriately trained/credentialed providers in labs meeting safety standards and when clinical history and neurologic exam document the need; EMG is usually performed with NCS unless a documented contraindication exists. NCS/EMG are indicated for focal/compressive neuropathies, traumatic nerve lesions, generalized neuropathies, radiculopathies, myopathies, plexopathies, and neuromuscular junction disorders (with single-fiber EMG for myasthenia gravis); screening for diabetic or ESRD polyneuropathy and sNCT testing are not covered. Providers should follow the AANEM model for reasonable study counts, document pre-test probability for NCS-only carpal tunnel evaluation, and limit EMG use for botulinum localization to one study per anatomic injection site.

"Electrodiagnostic testing must be performed by healthcare professionals who are appropriately trained and/or credentialed via formal residency/fellowship, national certification, or accredited post..."