It would be easier to see the actual operative report to help you with this. You are correct in needing modifers for the closure, but the only way to know if billing is applying the units incorrectly would be to see the note and see how many stages are being done.
The easiest way to remember is each stage is a "slice" that is then cut up into 5 blocks (if it is cut up into more than 5 blocks then you need to look at 17315). Remember to not use modifiers on your add on codes and I would see the modifiers more along the line of a -58 for a staged procedure.
Please feel free to contact me if you have any further questions.
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