Co-Surgeons PEG placement HELP!

Norwich, CT
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We have a private payer that will not pay for 43246-62. Our gastroenterologists have a general surgeon assist with the procedure 99% of the time so we have to bill with the 62 modifier. I notified the MDs that this payer will not pay for co-surgeons on this procedure and they want to know if we can just bill for the EGD portion (43235). I can't find any info on this, but I feel like we can't do this as the coding is not accurate because the PEG was placed during the procedure. When we called the general surgeon's office they said their claim was denied and they have written this off. That is what it sounds like we will have to do but I am not sure what is right here.