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Patient has problems with infection in his knee - provider did an arthrotomy and put in a static antibiotic spacer. Now he is taking the spacer out and putting a new one in and doing a temporary knee fusion. Was going to bill 20705 for removal and 20704 for the new one with the knee fusion code. They do not bundle in vitalware but per CPT book the fusion code is not listed as a CPT code to be used with the 20704/20705 codes. Would you use the old code of 11983 for removal and reinsertion? Trying to get the infection cleared up so the patient can have a total knee done in the future.