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I think this will be an unlisted code, but I cannot find anything similar to what they have done as a comparison code for billing. Below is part of the op note:

"Dissection was carried down through the subcutaneous tissue. Sternal wires were removed. There was a small amount of hematoma around the anastomosis of the right Glenn.  The left Glenn looked good. The left hemiazygos vein was identified, and a clip was placed. The pleural spaces were aspirated out. The chest tubes were cleaned."