Blog/Education

How to Appeal a Health Insurance Claim Denial

January 11, 2026

Receiving a health insurance claim denial can be stressful and confusing, but it's important to know that a denial is not the final word. According to industry data, a significant percentage of denied claims are overturned on appeal, yet most people never file one. Understanding the appeals process and your rights can help you get the coverage you're entitled to.

Common Reasons for Claim Denials

Before you begin the appeals process, it helps to understand why your claim was denied. Common reasons include:

  • The service was deemed not medically necessary. Your insurer may disagree with your doctor's recommendation for a particular treatment or procedure.
  • Prior authorization wasn't obtained. Some services require advance approval from your insurance company before they're performed.
  • The provider was out of network. If you received care from an out-of-network provider, your plan may deny or reduce coverage.
  • Coding or billing errors. Incorrect procedure codes or missing information on the claim form can trigger a denial.
  • The service isn't covered. Some treatments or procedures may be explicitly excluded from your plan's coverage.

Step-by-Step Appeal Process

  1. Review your denial letter carefully. Your insurer is required to provide a written explanation of why the claim was denied and instructions for how to appeal. Note the deadline for filing your appeal, which is typically 180 days.
  2. Gather supporting documentation. Collect medical records, your doctor's notes, letters of medical necessity, and any relevant clinical guidelines that support your case. Your doctor's office can be a valuable ally in this process.
  3. File an internal appeal. Submit a written appeal to your insurance company following their specific instructions. Include all supporting documentation and a clear explanation of why you believe the denial should be reversed. Keep copies of everything you send.
  4. Request an external review if needed. If your internal appeal is denied, you have the right to an external review by an independent third party. Under the ACA, all marketplace and most employer plans must offer this option. The external reviewer's decision is typically binding on the insurance company.
  5. Contact your state's Department of Insurance. If you're struggling with the process, your state's insurance regulator can provide guidance and may intervene on your behalf.

The appeals process can feel overwhelming, but persistence pays off. Having an advocate who understands the system can make a significant difference in the outcome. Reach out to Resilience Health Advisors for guidance on navigating claim denials and getting the coverage you deserve.

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