We have an APRN that will start assisting our MD during surgery. From what I am reading I would use the AS modifier since she is a non-physician. I wanted to know do I report the surgery on two separate claims and append the AS to the APRN's claim and if so what, if anything, do I append to the MD's claim? Or how would I report this to the payer so that they know that the MD performed the surgery and the APRN assisted during the surgery?