How to Appeal a Health Insurance Denial (And Win)

BySubramani

Getting a health insurance denial feels like the end of the road. It’s not. Insurance companies deny claims for many reasons — and many of those denials are wrong, incomplete, or reversible.

The appeals process exists because regulators know insurers make mistakes (and sometimes make decisions that prioritize cost over care). Here’s how to use it.

Why Claims Get Denied

  • Missing or incorrect information on the claim
  • Service deemed “not medically necessary”
  • Out-of-network provider
  • Pre-authorization not obtained
  • Treatment considered “experimental”
  • Coverage limitations or exclusions

Step 1: Understand Exactly Why You Were Denied

Request the Explanation of Benefits (EOB) and the denial letter. The denial letter must state the specific reason and cite the policy language used to deny the claim. Read it carefully — the reason for denial tells you exactly what to address in your appeal.

Step 2: File an Internal Appeal

You have the right to an internal appeal — a review by the insurance company itself. You must file within the timeframe stated in your denial letter (typically 180 days).

Your appeal should include:

  • A clear letter explaining why the denial was wrong
  • A letter of medical necessity from your doctor
  • Relevant medical records supporting the treatment
  • Scientific evidence or clinical guidelines supporting the treatment
  • Reference to your specific policy language

Step 3: Request an External Review

If your internal appeal is denied, you have the right to an independent external review by a third-party organization not affiliated with your insurer. Under the ACA, insurers must comply with external review decisions.

External reviews overturn insurer decisions about 40% of the time — significantly better odds than people expect.

Step 4: File a Complaint

If external review fails, file a complaint with your state insurance commissioner. Regulators have authority to investigate and overturn improper denials.

Key Tips for Winning Appeals

  • Be specific — vague appeals rarely succeed
  • Get your doctor involved — their letter carries significant weight
  • Cite scientific evidence — show the treatment is standard of care
  • Keep copies of everything
  • Meet every deadline

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