We have a pt that had a total knee, then developed an infection outside of post op period. they removed the prosthesis, inserted the non-biodegradable drug delivery implant, then after post op period for that surgery, they removed the device and inserted a new prosthesis. Aetna is denying the drug implant. Is anyone else familiar with the billing of these codes and may have some billing incite for me? We have tried billing with a modifier as well, no luck. We billed 27442, 22, LT and 11982, 22, LT. Side note: they denying the insertion of the implant as well.