Posterior vaginal compartment repair by vaginal approach for pelvic organ prolapse: (a) involving repair of one or more of the following: (i) perineum; (ii) rectocoele; (iii) enterocoele; and (b) using native tissue without graft; other than a service associated with a service to which item 35573, 35577 or 35578 applies (Anaes.) (Assist.)