We realized that some of our patients that were seen for their AWV should have been billed as the initial (G0438) and not the subsequent (G0439). We have already received payment from Medicare for the subsequent code. How would you go about correcting this and rebilling for the initial AWV? Is this a "reopening" that I should submit on the Medicare website or should I submit a corrected claim? I’m a fairly new biller so I would greatly appreciate any help on the best way to go about this. Thanks!!