An insurance appeal is your formal right to challenge a claim denial, and it is one of the most underused consumer protections in American healthcare. When an insurer denies a claim for a medical service, procedure, or medication, the denial is not final. Federal and state laws guarantee you the right to a structured review process, and the data consistently shows that a well-prepared appeal overturns the denial far more often than most people expect.
According to a HealthCare.gov analysis, internal appeals succeed in overturning denials in roughly half of all cases where they are filed. Yet the vast majority of denied claims are never appealed. If you have received a denial from your health insurance company, understanding the insurance appeal process is the first step toward getting the coverage you are entitled to.
How the Insurance Appeal Process Works
The appeal process has two main stages: the internal appeal and the external review. Each stage has specific rules, deadlines, and protections that vary depending on whether your plan is governed by ERISA (most employer-sponsored plans), state law (individual and small group plans), or Medicare/Medicaid regulations.
Internal Appeal
The internal appeal is reviewed by the insurer itself, but it must be handled by a different reviewer than the one who made the original denial decision. Under ERISA, you have 180 days from the date of the denial to file an internal appeal. The insurer must respond within 30 days for pre-service claims (services not yet provided) and 60 days for post-service claims (services already received).
During the internal appeal, you have the right to submit new evidence, provide arguments in writing, and request access to your complete claim file. The reviewer must consider all the information you submit, along with the original claim information, and issue a written decision explaining their reasoning.
External Review
If the internal appeal is denied, the ACA gives you the right to an external review by an independent review organization. External reviewers are clinical experts who are not affiliated with the insurer. Their decision is based on your medical records, the insurer’s criteria, and current medical standards. In most cases, the external reviewer’s decision is binding on the insurer.
You generally have four months after receiving the final internal appeal denial to request an external review. Standard external reviews must be completed within 45 days, while expedited reviews for urgent cases must be completed within 72 hours.
Types of Denials You Can Appeal
Almost any claim denial can be appealed, but the approach and evidence required vary by denial type.
Medical necessity denials occur when the insurer determines that a treatment is not clinically necessary. These are among the most commonly overturned denials because they often involve a disagreement between the insurer’s utilization review criteria and the treating physician’s professional judgment. Appeals for medical necessity should include detailed clinical evidence supporting the treatment.
Coverage denials occur when the insurer says the service is not covered under the plan terms. These require careful review of your plan documents to determine whether the insurer is correctly interpreting the coverage provisions. If there is ambiguity in the plan language, appeal based on the most favorable reasonable interpretation.
Administrative denials result from errors in the claims process, such as incorrect coding, missing information, or failure to obtain prior authorization. These are often the simplest to resolve, either through a corrected resubmission or a brief appeal letter explaining the error.
Network-related denials occur when you receive care from an out-of-network provider. If you had no reasonable access to an in-network provider, received emergency care, or were treated at an in-network facility by an out-of-network provider, you may have strong grounds for appeal, particularly under the No Surprises Act.
Building Your Insurance Appeal
A successful insurance appeal requires preparation, organization, and attention to detail. Follow these steps to build the strongest possible case.
Read the denial letter thoroughly. The denial must explain the reason for the decision, cite the plan provisions or clinical criteria applied, and describe your appeal rights including deadlines and procedures. If the denial letter is vague or incomplete, that itself may be a regulatory violation you can raise in your appeal.
Request your claim file. Under ERISA and the ACA, you have the right to review all documents and information relevant to your claim. This may include the reviewer’s notes, clinical criteria used, and internal correspondence. Understanding exactly how the insurer reached its decision helps you address the specific weaknesses in their rationale.
Gather your evidence. The most effective appeals include a letter from the treating physician explaining the clinical rationale, relevant medical records, peer-reviewed studies, clinical practice guidelines from recognized medical organizations, and a detailed response to the insurer’s stated denial reason. For guidance on structuring your letter, visit our how to write an appeal letter guide.
Submit before the deadline. Track your filing deadline carefully and submit with enough time to confirm receipt. Use certified mail, fax, or the insurer’s electronic submission portal. Keep copies of every document you send.
Expedited Appeals for Urgent Situations
If delaying a decision could seriously jeopardize your life, health, or ability to regain maximum function, you can request an expedited appeal. Under the ACA, insurers must decide expedited appeals within 72 hours. For Medicare plans, expedited appeals must be decided within 24 to 72 hours depending on the plan type.
To request an expedited appeal, contact the insurer’s appeals department by phone and follow up immediately in writing. Include a statement from your physician certifying that the standard appeal timeline would pose a serious risk to your health. The insurer may not require you to complete a standard internal appeal before granting access to an expedited external review in genuinely urgent cases.
What Makes Appeals Succeed
The most successful insurance appeals share several characteristics. They directly address the insurer’s stated reason for denial rather than making general arguments about the importance of the treatment. They include specific clinical evidence, not just assertions that the physician recommends the treatment. And they are organized in a clear, professional format that makes it easy for the reviewer to evaluate the case.
A detailed letter of medical necessity from the treating physician is consistently one of the most persuasive pieces of evidence. Peer-to-peer reviews, where the treating physician speaks directly with the insurer’s medical director, can also be highly effective and are available for most medical necessity denials.
Citing specific plan language that supports coverage is another powerful strategy. If your plan document lists the denied service as a covered benefit or if the insurer’s own clinical policy bulletin includes criteria that your case meets, pointing to that language directly can be decisive.
Regulatory Protections and Resources
Several regulatory bodies provide oversight and assistance for insurance appeals. The Department of Labor oversees ERISA plans and provides model appeal letters and educational resources. The Centers for Medicare and Medicaid Services administers the federal external review process and oversees marketplace plans.
State insurance departments regulate individual and small group plans and often provide consumer assistance programs that can help you prepare and file appeals. The NAIC maintains a directory of state insurance departments with contact information and complaint filing procedures.
Patient advocacy organizations, healthcare attorneys, and benefits consultants can provide professional assistance for complex or high-value appeals. Many offer free consultations or work on a contingency basis for insurance disputes. Our healthcare policy guide provides additional resources for navigating the regulatory landscape.
Frequently Asked Questions
How much does it cost to file an insurance appeal?
Filing an insurance appeal is free. There are no fees for internal appeals or external reviews. Your only costs are the time required to prepare the appeal, any postage or delivery costs, and any fees if you choose to hire a professional representative, which is optional for most appeals.
Can I appeal a denial from any type of insurance?
Yes. Health insurance denials can be appealed under the ACA, ERISA, Medicare, and Medicaid regulations. The specific procedures and deadlines vary by plan type, but the right to appeal is universal for health insurance in the United States. Dental, vision, and other supplemental insurance plans may also offer appeal rights, depending on the plan terms and applicable state law.
What if I missed the appeal deadline?
If you have missed the internal appeal deadline, you may still have options depending on your plan type and state law. Some states allow late appeals under certain circumstances, such as good cause for the delay. For ERISA plans, you may be able to proceed directly to legal action, although this forfeits the advantages of the administrative appeal process. Contact your state insurance department to explore your options.
How many times can I appeal the same denial?
Most plans allow at least one internal appeal. Some plans offer two levels of internal review. After exhausting internal appeals, you can request an external review. If the external review is unfavorable, further options may include filing a complaint with your state insurance department, requesting a second external review in some states, or pursuing legal action.
Is an insurance appeal worth the effort?
Statistically, yes. With roughly half of appealed denials being overturned, the odds are strongly in your favor when you file a well-prepared appeal. The financial value of a successful appeal can range from hundreds to hundreds of thousands of dollars depending on the denied service. Considering that the process is free and primarily requires your time, an insurance appeal is almost always worth pursuing.
Start Your Insurance Appeal Today
Every denied claim comes with an expiration date for your appeal rights, so acting promptly is essential. Review your denial letter, understand the specific reason, gather your evidence, and file a formal written appeal before the deadline. For templates and detailed guidance, explore our appeal letter resources and appeal letter sample page. The insurance appeal process is designed to protect your rights as a policyholder, and the data proves that using it is one of the most effective steps you can take to secure your healthcare coverage.