United Healthcare will not separately pay codes 99152 and 99153. I have tried modifier XS, 59, and most recently 51. I, however, cannot find any medical policy stating that it is not separately payable as well. I called UHC and spoke to a representative who told me that they are separately payable, but he could not tell me what modifier they accepted.
Does anyone have any assistance they can give with this? I have been going back and forth with them since July.

Any help is much appreciated, any brainstorming is much appreciated.

Thank you all in advanced.

Alli