Exploration of the brachial plexus, posterior subscapular approach, all necessary elements of the operation including (but not limited to):(a) resection of the first rib and/or second rib; and(b) vertebral laminectomies or facetectomies, if performed; and(c) any neurolyses performed; and(d) intraoperative neurophysiological recordings;excluding the following:(e) reconstruction of elements of the plexus;(f) spinal instrumentation(H) (Anaes.) (Assist.)