How to Appeal a Health Insurance Denial: Your Rights and Steps

1. Why Claims Get Denied

Insurance companies deny claims for a variety of reasons. Understanding the most common ones helps you avoid preventable denials and build a stronger appeal if one does occur:

• Lack of prior authorization: The procedure required advance approval that was not obtained. This is the single most common denial reason for outpatient services.
• Medical necessity: The insurer determined the service was not medically necessary based on its clinical guidelines.
• Out-of-network provider: You received care from a provider outside your plan's network without a referral or exception.
• Coding errors: The provider used an incorrect diagnosis or procedure code, causing a mismatch with what the insurer expects.
• Incomplete information: Missing documentation, unsigned forms, or insufficient clinical notes.
• Benefit exclusion: The service is not covered under your specific plan.

2. Know Your Rights

The Affordable Care Act (ACA) guarantees your right to appeal any coverage denial. Under federal law, every health plan must provide at least one level of internal appeal and, if the internal appeal is denied, access to an independent external review. Your insurer is required to send you a written explanation of why the claim was denied, including the specific plan provisions and clinical criteria used.

If your situation is urgent, meaning a delay could seriously jeopardize your health, you can request an expedited appeal. Insurers must respond to urgent internal appeals within 72 hours and urgent external reviews within 72 hours as well.

3. Internal Appeal

The internal appeal is your first formal challenge to a denial. You typically have 180 days from the date of the denial letter to file. During the internal appeal, the insurer must have a reviewer who was not involved in the original denial decision re-examine your case.

Steps for an effective internal appeal:

• Read the denial letter carefully and note the specific reason(s) and plan section(s) cited.
• Call the insurer to confirm the appeal process, deadline, and where to send your appeal.
• Write a clear, factual appeal letter that directly addresses each denial reason.
• Include supporting documentation: a letter of medical necessity from your doctor, relevant medical records, peer-reviewed studies, and clinical guidelines that support the treatment.
• Send everything by certified mail or the insurer's electronic portal and keep copies of everything.

4. External Review

If your internal appeal is denied, you have the right to an external review by an Independent Review Organization (IRO) that has no financial connection to your insurer. You generally have four months after receiving the internal appeal denial to request external review.

The IRO's decision is binding on the insurance company. External reviews have a meaningful success rate, particularly for medical necessity denials where the treating physician provides strong clinical justification. The external review process is free for the consumer; the insurer pays the IRO.

5. What to Include in Your Appeal

A well-organized appeal package makes it easy for the reviewer to rule in your favor. Include:

• Your appeal letter: State your name, policy number, claim number, date of denial, and the specific relief you are requesting. Explain why the denial was incorrect, referencing your plan's benefits and the clinical evidence.
• Letter of medical necessity: Your treating physician explains why the service is medically necessary for your specific situation, citing clinical criteria and guidelines.
• Medical records: Relevant office notes, test results, imaging reports, and treatment history that support the necessity of the care.
• Supporting literature: Peer-reviewed studies, medical society guidelines, or FDA approvals that establish the treatment as standard of care for your condition.
• Plan documents: Highlight the specific sections of your plan that cover the service, especially if the denial contradicts the plan language.

6. State DOI Complaints

If you believe your insurer acted in bad faith or violated state insurance law, you can file a complaint with your state's Department of Insurance (DOI). While the DOI cannot overturn a denial directly, it can investigate whether the insurer followed proper procedures, applied the correct clinical criteria, and complied with state regulations.

State DOI complaints are free to file and can trigger regulatory action against insurers that systematically deny valid claims. Many states have online complaint portals that make filing straightforward. Filing a DOI complaint does not replace the appeal process, but it can be pursued simultaneously and sometimes prompts the insurer to reconsider.