What to Do When Your Health Insurance Claim Is Denied

Receiving a health insurance claim denial is a frustrating experience that many insured people respond to by accepting the outcome and paying the bill themselves. This response is understandable but often unnecessary. Claims that are denied on initial processing are appealed successfully in a meaningful proportion of cases, and the tools available to fight a denial, from internal appeals to independent external review to state insurance commissioner complaints, are more accessible than most people realize.

The reasons for claim denials are varied, and understanding the specific reason for any particular denial is essential to determining the right response. Some denials involve clerical or billing errors that can be corrected with a phone call. Others involve coverage determinations that require a medical justification appeal. Still others may represent violations of parity law or other legal requirements that support a regulatory complaint.

This guide walks through the denial response process systematically, from understanding the denial notice through internal appeal, external review, and escalation options, giving you a complete picture of the tools available at each stage.

Understanding Your Denial: The First Step

The Explanation of Benefits or denial notice from your insurer must state the specific reason for the denial in language that is meaningful rather than purely generic. Common reasons for denial include claims for non-covered services, services that require prior authorization that was not obtained, claims submitted by out-of-network providers in plans that do not cover out-of-network care, services determined to be not medically necessary, services the insurer considers experimental or investigational, and administrative errors in the claim submission.

The specific denial reason matters because it determines the right response strategy. A denial for lack of prior authorization may be resolved differently than a denial for medical necessity, which is different from a denial based on a plan exclusion, which is different from an administrative error. Read the denial notice carefully and identify the precise stated reason before deciding on a response.

Request the full clinical guidelines and coverage policies that the insurer used to make the determination. Insurers are required to provide the specific criteria they applied upon request. This information is essential for a medical necessity appeal because it tells you exactly what standard you need to meet and what evidence would satisfy that standard.

The Internal Appeal Process

ACA-compliant health plans must offer at least one level of internal appeal. For claims denials, you must file an internal appeal within 180 days of receiving the denial notice for most plans. The deadline matters; missing it can eliminate some future options. File promptly even if you are still gathering supporting documentation, which can be submitted as the appeal proceeds.

A strong internal appeal includes a cover letter that specifically addresses the reason for the original denial, clinical documentation from your treating provider supporting the medical necessity or appropriateness of the service, relevant medical literature supporting the treatment, and any applicable insurance company clinical coverage criteria that the service meets.

Your physician is your most important ally in a medical necessity appeal. A letter from the treating physician that addresses the insurer's specific stated criteria for medical necessity, not a generic letter of medical necessity but one that specifically rebuts the insurer's clinical rationale, is the most powerful component of an internal appeal. Ask your physician to review the insurer's denial rationale and address it directly.

External Review: Independent Assessment of Your Denial

When an internal appeal fails, federal law grants the right to an independent external review for most health plan types. An accredited independent review organization reviews the clinical and coverage question without deference to the insurer's determination and issues a binding decision. Insurers must comply with external review decisions.

For urgent medical situations, an expedited external review is available and must be completed within 72 hours. For standard external reviews, the process takes up to 45 days. You can initiate external review simultaneously with the internal appeal in some situations, or after exhausting internal appeals.

External review is free for the consumer. The cost is borne by the insurer. The decision of the independent reviewer is binding: if they conclude the service should have been covered, the insurer must pay. This binding nature makes external review one of the most powerful tools available for coverage disputes.

Escalation: State Complaints and Regulatory Resources

State insurance commissioners regulate fully insured health plans and have enforcement authority over coverage denials, parity violations, and other insurance law requirements. Filing a complaint with your state insurance commissioner triggers an investigation that the insurer must respond to and that can produce coverage decisions, refunds, and regulatory action.

The Department of Labor's Employee Benefits Security Administration handles complaints about self-insured employer plans that are not regulated by state insurance commissioners. For parity violations specifically, both HHS and the Department of Labor share enforcement authority. Filing complaints with multiple agencies simultaneously is permissible.

For Medicare Advantage coverage disputes, the appeals process runs through the plan and then through independent review by the Qualified Independent Contractor program. Medicare beneficiaries have specific appeal rights and timelines that differ from commercial health plan appeal processes.

An attorney specializing in insurance law or health law can be valuable when a denial involves significant amounts, when the denial appears to violate federal law such as parity requirements, or when the appeals process has been exhausted without success. Many health insurance attorneys offer initial consultations at no charge and take cases on contingency.

Final Thoughts

A health insurance denial is not a final answer. It is the beginning of a process that, when navigated with the right information and the right documentation, results in reversal in a meaningful proportion of cases. The appeal system exists specifically because initial determinations are not infallible, and the external review process provides an independent check on insurer decisions that has real binding force.

The key to a successful appeal is understanding specifically why the claim was denied, building the appeal around the specific criteria the insurer applied, engaging your physician as a clinical advocate for the appeal, and escalating through all available mechanisms when internal appeals are unsuccessful.

Do not accept a denial that seems wrong without appealing it. The process is accessible, the tools are available, and the outcomes justify the effort.