How Can I Get Cpt 15830 Approved in Addition to Already Approved 15847 for Functional Repair?

I have consulted with 3 plastic surgeons and 2 general surgeons regarding a diastasis repair w/umbilical hernia related to pregnancy. General surgery cannot do the diastasis repair; refering me to the plastic surgeons. The plastic surgeons need the insurance to prior auth for a pannulectomy in order to do the surgery.The diastasis repair has been approved but after letters from my primary doctors and surgeons 15830 is still denied after a 2nd level appeal. Any suggestions greatly appreciated!