What is the Difference Between a Claim Denial and a Claim Rejection?

A rejection occurs when a claim is not accepted into the payer’s system due to technical errors, such as incorrect patient information, invalid insurance ID numbers, missing required fields, or incorrect formatting. Rejected claims never enter the adjudication process and are returned quickly, usually within days. They don’t count against timely filing limits, so you can correct and resubmit them. A denial occurs after a claim has been processed and adjudicated by the payer, who determines they won’t pay for the service. Denials require formal appeals, do count against timely filing deadlines for the original claim, and may involve clinical review. Common denial reasons include lack of medical necessity, non-covered services, or benefits exhaustion. Knowing the difference between a denial vs a rejected claim is crucial for addressing each situation appropriately.