I am looking for some advice. One of our providers performed a single stage revision left total knee arthroplasty with polyethylene exchange, irrigation & debridement and implantation of antibiotic impregnated beads. We billed the revision as 27486 (Revision of total knee arthroplasty, 1 component). The insurance is stating that this needs to be billed as 27310 for Arthrotomy for infection and states that the poly exchange is incidental. The 27310 does not seem correct to me since one component was actually removed and replaced with a new one. Any advice?