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I'm trying to determine how to code this case correctly. "A midline sternotomy was performed. The physician replaced the ascending aorta graft (33860), total arch replacement with hybrid debranching graft to 10 mm branch to innominate artery, 8 mm branch to left common carotid, and 8 mm branch to left subclavian (33870, 35626 x 3). Then he performed a stent graft repair of descending thoracic aortic aneurysm with coverage of the subclavian with TAG graft (33880). A Dacon graft was sewn end-to-side to the innominate artery for the purposes of cerebral perfusion. Epiaortic ultrasound of ascending aorta (76998-26)."