CPT® Code 95926

Short-latency somatosensory evoked potential study, stimulation of any/all peripheral nerves or skin sites, recording from the central nervous system; in lower limbs

Short-latency somatosensory evoked potential (SEP) studies are diagnostic procedures that assess the functionality of the somatosensory pathways in the central nervous system by measuring the electrical signals generated in response to sensory stimuli. These signals are produced by afferent peripheral nerve fibers when they are stimulated. The short-latency SEPs specifically refer to the initial portion of the SEP waveform that occurs shortly after the stimulus is applied, with the latency time varying based on the specific nerve being tested. For instance, when testing upper extremity nerves, the short-latency SEPs are identified within 25 milliseconds of stimulation, while for the tibial nerve in the lower limbs, this latency extends to 50 milliseconds. Abnormal results from these tests can indicate dysfunction within the somatosensory pathways, which may be indicative of various neurological conditions. The procedure involves placing electrodes on the skin over the targeted peripheral nerve, with additional electrodes positioned on the scalp, spine, and proximal to the stimulation site to accurately record the SEP waveforms. The use of monophasic rectangular pulses delivered through a stimulator elicits muscle twitches and generates the SEP waveforms that are subsequently analyzed by the physician, who then compiles a written report detailing the findings. This procedure is essential for diagnosing conditions affecting sensory nerve function and is specifically coded as CPT® Code 95926 when performed on the lower limbs.