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TENS is also considered experimental and investigational for any of the following not an all-inclusive list because there is inadequate scientific evidence to support its efficacy for these specific types of pain:. The trial period must be monitored by the physician to determine the effectiveness of the TENS unit in modulating the pain. The physician's records must document a reevaluation of the member at the end of the trial period, must indicate how often the member used the TENS unit, the typical duration of use each time, and the results.