What CPT is best when the surgeon takes out the spacer and replaces with new components, tibial, femoral and patellar? 27447 is from a knee never replaced before, so this does not describe what he is doing. 27487 is taking out all the total knee components and putting back in total knee componentns. That seems like too much work for what he is actually doing by removing the spacer. 27488 is the opposite procedure from what is being done? Should I code unlisted and compare to 27488??