Vertebral body, piecemeal or subtotal excision of (where piecemeal or subtotal excision is defined as removal of more than 50% of the vertebral body), 3 or more vertebrae, not being a service associated with: (a) anterior column fusion when at the same motion segment; or (b) a service to which item 51051, 51052, 51053, 51054, 51055, 51057, 51058 or 51059 applies (Anaes.) (Assist.)