hi, you should be billing 66984 55 with RT OR LT. now depending on carrier, they should pay, if you get a denial, you need to find out if the surgeon billed with the 54, that could be why it denied, or you need to add the transfer of care - narrative, surgery date, post op date, when post op is completed on the claim form, where it says additional information on the claim form. sometimes the insurance you are billing, you need to call them and make sure they understand its the post management and not the surgery, have them scan the image of the claim so they can see it. hope this helps