Rejected - Unprocessable Claim Duplicate of a previously processed claim/line.

Payer is stating that this is a duplicate claim on their end.

Claim has already been sent to the payer. If this is supposed to be a corrected claim, verify how payer wants to receive a corrected claim. **If payer is Medicare and claim was only sent once, claim may have been processed twice on their end. You can contact Medicare to check claim status.