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Both: (a) percutaneous repositioning of sacral nerve lead or leads using fluoroscopic guidance, or open repositioning of sacral nerve lead or leads; and (b) intra‑operative test stimulation, to correct displacement or unsatisfactory positioning, if inserted for the management of: (i) detrusor over‑activity that has been refractory to at least 12 months conservative non‑surgical treatment; or (ii) non‑obstructive urinary retention that has been refractory to at least 12 months conservative non‑surgical treatment; other than a service to which item 36663 applies (H) (Anaes.)