Denial code library
What each claim adjustment reason code means, what causes it, how to fix it, and whether it is worth appealing. Free, no sign-up.
| Code | What it means | Appealable |
|---|---|---|
| CO-11 | Diagnosis does not support the procedure billed | Yes |
| CO-16 | Missing or invalid information on the claim | Yes |
| CO-18 | Payer has already received this claim | Yes |
| CO-29 | Filed after the payer deadline | Yes |
| CO-45 | Charge above the contracted allowed amount | No |
| CO-50 | Payer says the service was not medically necessary | Yes |
| CO-97 | Bundled into another service already paid | Yes |
| CO-109 | Sent to the wrong payer | No |
| CO-151 | Frequency or quantity exceeds what the payer allows | Yes |
| PR-204 | Not a benefit under this plan | Yes |
See what your claims are leaving behind
Send us a month of remittance data and we will tell you what it says: which codes are being denied, how much of it is recoverable, and how long your money is sitting in A/R. It takes about a week and there is nothing to sign.