A Denial Is a Starting Point, Not a Final Answer
Health insurance claim denials are extremely common. Insurers deny claims for a wide range of reasons — missing prior authorization, coding errors, out-of-network determinations, medical necessity disputes — and many denials are reversed on appeal. The appeals process exists precisely because initial processing is automated and error-prone. Most patients do not know this, so most denials are never challenged.
Reading the Explanation of Benefits
Your Explanation of Benefits (EOB) is the document your insurer sends after processing a claim. It is not a bill — it is a record of how the claim was handled. The EOB shows the total billed amount, the insurer's allowed amount, the amount the insurer paid, and the amount you owe. Critically, it includes a reason code and a brief explanation for why any portion was denied or adjusted. That reason code is the starting point for your appeal.
Common Denial Reasons and What They Mean
- Prior Authorization Required: The service needed pre-approval that was not obtained. Check whether the authorization was actually submitted — sometimes it was, and this is a processing error.
- Not Medically Necessary: The insurer's review concluded the service did not meet their clinical criteria. This is one of the most commonly reversed denial types when appealed with supporting documentation.
- Out-of-Network: The provider was not in your plan's network. If the service was urgent or no in-network provider was available, you may qualify for an exception.
- Coordination of Benefits: The insurer believes another plan should pay first. This often requires a simple correction if you do not have other coverage.
Writing an Effective Appeal
An appeal letter should be concise and factual. State the claim number, the service date, and the denial reason. Explain specifically why the denial was incorrect — referencing your plan documents, the provider's clinical notes, or the relevant coverage section. Include any supporting documentation: clinical notes, a letter of medical necessity from your provider, or EOBs from prior approved claims for the same service.
Using Your Health Records in an Appeal
FreeHealth.ai can help you read and understand the clinical documentation in your records that supports your appeal — visit notes, test results, and diagnoses written in clinical language that can be hard to parse when you are trying to build a case. Connect your MyChart and understand what your records actually say.
