I submitted a 66984 + 65756 procedure and forgot to add the tissue V2785 onto the (CMS1500) claim for Medicare. (For context, our office is a free-standing ASC and submits Facility Fees on a CMS1500 form electronically). I tried submitting the tissue on a separate claim with same DOS and included the medical notes, but it still got denied. The procedure got paid though. In order to get reimbursement for the tissue, I needed to add it along with 66984 + 65756 procedures. What steps do I need to take? Do I need void the tissue claim I sent and the original procedure claim that got paid? What does that do if I void a claim that got paid, how do they take it back the $$$? And if I void--do I just submit a whole new claim with everything on it as normal? Or do I do a replacement claim on the original procedure claim? If so, is there something I need to note on the claim? I'm fairly new to medical billing but have never had to do this before... any advice is much appreciated!