How to bill when ortho surgeon follows surgical patient, but didnt do the surgery.

We are following an ORIF of bi-malleolus surgical patient. The surgery was done in another city 5 days ago, and we assumed responsibility for this patients surgical recovery. How should I code, as a surgical procedure with a modifier showing reduced fees, or new patient 99204 and follow-up visits, and removal of sutures, etc. thanks
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