Question: May I report one unit of 95925 for each site the neurologist tests? Answer: You should report only a single unit of 95925 (Short-latency somatosensory evoked potential study, stimulation of any/all peripheral nerves or skin sites, recording from the central nervous system; in upper limbs) or its companion codes 95926 (... in lower limbs) and 95927 (... in the trunk or head) no matter how many skin sites (dermatomes) the neurologist tests.
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And, the neurologist is not required to test a minimum number of sites to report 95925-95927 (note the use of the term "any/all" in the descriptors).
Be aware, however, that CPT defines 95925-95926 as bilateral codes, as indicated by "limbs" in the descriptor. Therefore, if you test on one side only, you must append modifier -52 (Reduced services) to the appropriate code.