Wiki Removal of Fat Pad on the Pulmonary Artery

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My surgeon operated on a patient intending to do a RCA mobilization (which I also can't find a code for), but ended up only removing a significant fat pad from the pulmonary artery instead. He did a sternotomy, opened the pericardium with the intention of RCA reimplantation. Once he removed the fat pad surrounding the pulmonary artery he had a better view of the RCA and decided that reimplantation would not be necessary, and closed the patient.
I have been wrestling with this one for days and my surgeon is not very helpful. Any ideas?