Let me preface this by saying I know nothing about billing oral surgery codes, but certain rules apply regardless of the codes being billed. I did look up each code description, and I *think* your issue may be that these are codes that cannot be billed with units. Even though that is how you pre-authed them. You need to check the NCCI/CCI edits on these codes, and see if they are allowed to be billed with as many units as you billed them with, OR, if you should have billed some of them with 50 modifiers if they were done bilaterally, or with 59 modifiers if they were NOT done bilaterally, but were done on separate sites on the jaw. Check the MUE also, because that will tell you how many units can be billed per session/encounter, and if you have gone over the MUE unit amount for a CPT code, you need to appeal with notes showing why it was gone over.