What is the difference between conversion and revision?

My DR sent my approval letter in and it said that he wanted to convert my VBG int a RNY. BCBS says that they only have 2 procedure codes for this one is for gastric bypass and one is for revision of gastric bypass . They will not proceed with my case until they get the procedure codes straightened out with my Dr's office . Is there a difference between revising a previous surgery and converting a previous surgery? I'm so scared that bcbs will deny me now because of this.

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