I have a Dr. who performed a C-Section & BTL but as the diagnosis he used TIUP; Repeat C/S; & MPDPS. I told him the C-Section could be billed if he used Repeat C/S & MPDPS (because the pt had a prior C/S & she also wanted permanent sterilization), of course, he refuses to do so. Can anyone tell me where in our coding rules that TIUP (used as the 1st diagnosis) is not a billable diagnosis? I need to show him as a ruleTIUP is not Medically Necessary for a C-section.