Repair or replacement of ascending thoracic aorta: (a) including: (i) cardiopulmonary bypass; and (ii) retrograde cardioplegia (if performed); and (b) not including valve replacement or repair or implantation of coronary arteries; other than a service associated with a service to which item 11704, 11705, 11707, 11714, 18260, 33824, 38816, 38828 or 45503 applies (H) (Anaes.) (Assist.)