Health insurance denial codes, explained

Your health insurer prints a claim adjustment code next to every adjustment and denial on your EOB and denial letters — covering medical bills, prescriptions, medical equipment, prior authorization and Medicare. Most are never explained to you. Find your code below for what it means, what usually causes it, and what to do next.

These pages explain what codes mean. They are information, not advice, and do not tell you whether your specific claim should have been paid.