A denied health insurance claim isn't necessarily final. Insurers are generally required to provide an appeals process, and a meaningful share of appealed denials are ultimately overturned, particularly when the appeal is supported by clear documentation addressing the specific denial reason.

Understanding the actual denial reason first

Before appealing, get a clear, specific explanation of why the claim was denied — common reasons include a service deemed not medically necessary, a provider considered out-of-network, or missing prior authorization. The appeal strategy differs significantly depending on which of these applies, so understanding the specific reason is the essential first step.

Worth knowing

Insurers are generally required to provide a written explanation for a denial that includes specific appeal rights and deadlines — if this information wasn't clearly provided, requesting it explicitly is a reasonable and often necessary first step.

Building a strong internal appeal

An internal appeal, submitted directly to your insurer, generally benefits from a letter addressing the specific denial reason directly, along with supporting documentation from your treating physician explaining medical necessity where relevant. Vague or general appeals that don't address the specific stated denial reason are less likely to succeed than ones that directly counter the insurer's stated rationale.

Pursuing an external review if the internal appeal fails

If an internal appeal is denied, most plans are required to offer access to an external review process, where an independent third party not affiliated with your insurer reviews the decision. This external review's decision is often binding on the insurer, providing a genuinely independent check on the original denial.

  • Obtain a clear, written explanation of the specific denial reason before starting any appeal
  • Gather supporting documentation from your treating physician that directly addresses the stated denial reason
  • Track and meet all stated appeal deadlines carefully, since missing them can forfeit your appeal rights
  • Pursue external review if an internal appeal is unsuccessful, since this provides an independent decision-maker

Frequently asked questions

How long does an appeal typically take?

Timelines vary by plan and the urgency of the underlying medical situation, with expedited review processes generally available for urgent cases requiring a faster decision than standard appeal timelines allow.

Can a patient advocate or ombudsman help with an appeal?

Yes, many states and some employers offer patient advocacy resources or insurance ombudsman services that can provide guidance through the appeals process, particularly for complex or high-stakes denials.

MindfulMoney is an independent comparison platform. We may earn a commission when you click certain partner links in this article — this never affects what we cover or how we explain it. Rates and terms mentioned are illustrative examples current as of June 2026 and can change; always confirm current terms directly with the provider.