Cystoscopy, with ureteric catheterisation, unilateral: (a) guided by fluoroscopic imaging of the upper urinary tract; and (b) including one or more of ureteric dilatation, insertion of ureteric stent, or brush biopsy of ureter or of renal pelvis; other than a service associated with a service to which item 36818, 36821 or 36830 applies (H) (Anaes.) (Assist.)