Wiki Medicare and asst @ sx in an office setting

Whether or not the code allows an assist the the key question here. If the code does, then the assist can be MD/DO (mod -80), or PA/NP/CNS (mod -AS).
Very few office settings have the capability to perform the types of procedures that allow for a surgical assist. If your office does, and there is an assist, you may bill for it.
Here are Palmetto's pages about -80 and -AS:
 
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