How a claim denial becomes an appeal
A denial is not the end of a claim. It is a routing problem. The denial arrives with a code that says why, and that code points to one of a small number of remedies. Here is the whole path, in plain terms.
What a denial actually is
When a payer declines a claim, it does not send a letter written by a person. It sends a machine-readable remittance (an 835, the electronic version of the Explanation of Benefits) carrying one or more reason codes. These are the CARC codes, Claim Adjustment Reason Codes, a standardized vocabulary shared across payers. The code is the useful part: it tells you which of a few paths this claim belongs on.
Reading the code, picking the remedy
Most denials sort into three buckets, and the reason code tells you which one. The point is that the remedy is largely determined by the code, not decided from scratch each time.
| Remedy | Typical codes | What triggered it |
|---|---|---|
| Corrected claim | CO-11, CO-16, CO-18 | A fixable submission error: diagnosis and procedure mismatch, missing information or modifier, or a duplicate. |
| Appeal letter | CO-50, CO-97, CO-151, CO-197 | A decision worth contesting: medical necessity, bundling, service-count, or a missing prior authorization. |
| Reprocessing request | CO-45, PR-204 | A pricing or coverage adjustment: charge exceeds the fee schedule, or the service falls outside plan coverage. |
A corrected claim is exactly that: fix the error and resubmit. An appeal letter argues the decision was wrong and asks the payer to reconsider. A reprocessing request asks the payer to re-adjudicate under the right pricing or coverage. Same denial pile, three different actions.
The payer profile decides the how
Knowing the remedy is only half of it. Each payer also has its own filing window, its own channel (portal, fax, mail), and its own required form. Miss the window and a winnable denial is simply dead, no matter how strong the argument. So every appeal is really two questions: what to say, and where and by when to send it.
Why so few appeals get written
See it run
The output routing described here (denial code in, corrected claim or appeal letter out) is the part that is live today. You can run it on a sample denial on the homepage, or see how the claim data gets there in how Yeam connects.
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