Insurance Denied Your Claim? Here's Exactly What to Do
Getting a denial letter can feel overwhelming — but it's not the end. Appeal outcomes vary widely, but in many real-world datasets a meaningful share of appealed denials are overturned. This guide walks you through what to do right now, step by step.
Step 1: Don't Panic — and Don't Pay Yet
A denial doesn't mean you owe the full amount. Before paying anything:
- Read your Explanation of Benefits (EOB) carefully
- Note the specific reason for the denial
- Check the appeal deadline (usually printed on the denial letter)
- Do NOT ignore it — deadlines are real and enforceable
Step 2: Call Your Insurance Company
Sometimes denials are caused by simple errors — wrong codes, missing information, or processing mistakes. Call the number on your insurance card and:
- Ask for a detailed explanation of the denial
- Confirm whether it's a coding error that can be resubmitted
- Ask what documentation they need for an appeal
- Write down the representative's name, date, and reference number
Step 3: Talk to Your Doctor's Office
Your provider's billing department deals with denials every day. They can:
- Correct and resubmit claims with proper codes
- Write a letter of medical necessity
- Provide medical records to support your appeal
- Sometimes handle the appeal process on your behalf
Step 4: File a Formal Appeal
If the denial wasn't a simple error, you'll need to file a formal appeal. You have two levels:
- Internal Appeal — Your insurer reviews the decision again (required first step)
- External Review — An independent third party reviews your case (if internal appeal fails)
Your appeal should include a clear letter explaining why the denial was wrong, supported by medical documentation. See our appeal letter templates →
Step 5: Know When to Escalate
If your appeals are exhausted, you still have options:
- File a complaint with your state's Department of Insurance
- Contact a patient advocate — organizations like the Patient Advocate Foundation offer free help
- Consult an attorney — especially for large claims or bad-faith denials
- Contact your employer's HR — if you have employer-sponsored insurance, they may be able to intervene
Common Denial Reasons and How to Respond
| Denial Reason | What It Means | What to Do |
|---|---|---|
| Not medically necessary | Insurer doesn't think you needed the treatment | Get a letter of medical necessity from your doctor; cite clinical guidelines |
| No prior authorization | Treatment wasn't pre-approved | Request retroactive auth; argue urgency if applicable |
| Out of network | Provider wasn't in your plan | For emergencies (and certain facility-based situations), federal protections may apply (e.g., No Surprises Act). Otherwise, ask for a network adequacy or continuity-of-care exception and document lack of in-network options |
| Coding error | Wrong procedure or diagnosis code | Have your provider correct and resubmit — no appeal needed |
| Experimental | Insurer considers the treatment unproven | Cite FDA approval, clinical guidelines, peer-reviewed studies |
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