Antibiotic Spacer

My associate doctor recently billed for a hospital outpatient surgery: 28005 and 11981. The antibiotic spacer kept displacing during the p/o period, so he went back earlier than expected to do the following, hence the patient is still in the post operative global period from the first set of procedures: 28755 -- 58,RT -- M10.9 20705 -- 58,RT -- M86.9 11750 -- 79,T5 -- L60.0 Is this coded correctly with regard to modifiers and diagnosis codes? I personally have never done a staged procedure, and I know my billing company probably won't know either, so I figured I'd ask here first before submitting and getting hit with denials.