How to Appeal a Denied Health Insurance Claim

A health insurance denial is not always the insurer’s last word. You may be entitled to ask the plan to reconsider through an internal appeal and, if the denial is upheld, ask an independent organization to conduct an external review. The strongest appeals identify the precise denial reason, answer it with plan language and clinical evidence, and meet the deadline stated in the denial notice.

For many plans subject to federal Affordable Care Act appeal protections, you generally have 180 days from receiving the denial notice to file an internal appeal. If the insurer issues a final internal adverse benefit determination, a request for external review is generally due within four months after you receive it.

Those are general federal timeframes, not a universal rule for every claim. Deadlines and procedures can vary by state, plan type, and governing rules. Individual and group coverage may follow different state or federal processes; a self-funded employer plan may be governed primarily by federal law. Medicare, Medicaid, short-term coverage, grandfathered plans, and other programs may use different appeal systems. Always follow the deadline and instructions in your denial notice and plan documents, and verify them with your insurer, employer benefits administrator, or state insurance department.

First, identify what was denied and why

Start with the denial notice—often called an adverse benefit determination. It should explain the service or claim affected, the reason for denial, the plan provision involved, and how to appeal. Common reasons include:

the service was considered not medically necessary;
the treatment was classified as experimental or investigational;
prior authorization or a referral was missing;
the provider was outside the network;
the service was described as excluded or not covered;
eligibility or coverage had ended;
information was missing; or
a billing or coding problem prevented correct claim processing.

Compare the notice with your explanation of benefits (EOB), the actual provider bill, and the relevant section of your plan’s Summary Plan Description, Evidence of Coverage, or certificate. An EOB is not itself a bill. It shows how the insurer processed the claim and is often the best place to find the denial code and stated patient responsibility.

Make sure you are pursuing the right dispute. If the provider submitted the wrong code, charged twice, or billed for a service you did not receive, ask for correction and use the guide to dispute a medical bill error. If the insurer received an accurate claim but refused coverage under the plan, an insurance appeal is the appropriate path. Sometimes both issues must be handled in parallel.

Step 1: get the complete record

Call the member-services number on your insurance card and ask the representative to explain the exact denial basis. Take notes, including the date, representative’s name or ID, reference number, and what was said. Then request the material needed to assess the decision:

the full denial notice and appeal instructions;
the plan language, medical policy, or coverage guideline relied upon;
the claim form and codes submitted by the provider;
any clinical-review criteria used in the decision;
the name and credentials of the reviewer when disclosure is required;
copies of records or other documents relevant to the claim; and
confirmation of the filing deadline and submission method.

Ask the provider’s billing office whether it will correct and resubmit a simple clerical claim, supply medical records, or conduct a clinician-to-clinician review. A corrected claim is not necessarily an appeal, so confirm whether it preserves the appeal deadline. Do not let informal phone calls consume the time available to file.

Step 2: build the internal appeal

Your appeal should make it easy for a reviewer to connect the plan’s coverage terms to the medical facts. Follow the denial notice exactly. If the plan supplies a form, complete it, but include a focused appeal letter and supporting documents when permitted.

What to include

Include:

your name, member ID, group or policy number, and contact information;
the claim number, dates of service, provider, procedure, and amount at issue;
the denial date and the exact reason given;
a clear statement that you are requesting an internal appeal;
a short explanation of why the decision should be reversed;
the plan provisions that support coverage;
clinical records, test results, treatment history, and prior treatments that failed;
a letter of medical necessity from the treating clinician, when relevant;
credible clinical guidelines or studies if medical necessity or experimental status is disputed; and
a numbered list of every enclosure.

Address the insurer’s actual rationale rather than simply saying the service was necessary. For example, if the denial says a less intensive treatment had to be tried first, identify any prior therapies, outcomes, contraindications, and the plan language governing that requirement. If the dispute concerns prior authorization, attach the authorization number, portal confirmation, fax receipt, or call record.

Send the appeal through an approved method and retain proof of submission. Save a complete copy of the packet exactly as sent. For postal submissions, consider tracked delivery. For a portal or fax, save the confirmation screen or transmission report.

Internal appeal timing

HealthCare.gov states that you generally must file an internal appeal within 180 days—six months—after receiving notice that the claim was denied. For plans governed by the federal rules, the insurer generally must complete its internal review within:

72 hours for an urgent-care claim;
30 days for a denial involving a service you have not yet received; or
60 days for a denial involving a service already received.

Different rules may apply to your coverage. Use the timeframe in your notice, especially if it gives you more time, and verify any ambiguity promptly.

Urgent cases and expedited review

If waiting through the ordinary process could seriously jeopardize your life, health, or ability to regain maximum function, ask the insurer for an expedited appeal. Your clinician’s explanation of the urgency can be important. In qualifying urgent situations, federal rules may allow an external-review request at the same time as the expedited internal appeal rather than requiring you to finish the ordinary internal process first.

Do not postpone urgently needed care solely to assemble paperwork. Contact the insurer and treating clinician immediately and follow emergency medical advice. The hospital emergency-treatment rights guide explains the separate EMTALA protections that apply to screening and stabilizing care in covered emergency departments.

Step 3: review the insurer’s response

If the insurer overturns the denial, request written confirmation and check the next EOB and provider statement to ensure the claim was reprocessed correctly. An approval does not automatically mean the account balance has already been updated.

If the insurer upholds the denial, it should issue a final internal adverse benefit determination. Read it closely. The notice should explain the decision and describe any right to external review, including where and when to file. Note whether the decision introduced a new reason; if so, preserve your right to respond under the applicable process.

Step 4: request an external review

An external review moves the covered dispute outside the insurance company. An independent review organization examines the plan terms and relevant medical evidence. Under the applicable process, the insurer must follow the independent reviewer’s decision.

External review is commonly available for denials involving medical judgment—such as medical necessity, appropriateness, level of care, or whether treatment is experimental—as well as certain rescissions of coverage. It is not available for every disagreement. For example, a plan may contend that a benefit is categorically excluded without requiring medical judgment. The final denial notice should state whether external review is available and how to request it.

HealthCare.gov says that, under the federal process, you generally must request external review within four months after the date you receive the final notice. If the last filing day falls on a weekend or federal holiday, the deadline generally extends to the next business day. States may run their own external-review processes with different forms or timing, and the route may depend on whether a plan is fully insured or self-funded. Treat the notice’s date as controlling unless the appropriate regulator confirms otherwise.

A standard external review generally must be decided no later than 45 days after the request is received under the federal process. An expedited external review generally must be decided as quickly as the medical condition requires and no later than 72 hours after receipt. These are review timeframes, not extensions of your filing deadline.

Include the final denial, your prior appeal, supporting records, and any focused response to the insurer’s final reasoning. Follow the notice to submit the request to the correct state agency, federal external-review process, or independent review organization.

Special plan types and where to get help

The name on your insurance card does not necessarily tell you who regulates the plan. An employer may hire an insurance company to administer a self-funded plan while the employer bears the claim risk. Ask the benefits office whether the plan is fully insured or self-funded and request the Summary Plan Description.

For fully insured individual or group coverage, your state department of insurance can explain state appeal and external-review rights.
For many private-sector self-funded employer plans, the U.S. Department of Labor’s Employee Benefits Security Administration may be the appropriate source of assistance.
Medicare and Medicaid have program-specific appeal instructions; use the notice issued by the program or managed-care plan.
Your employer’s human-resources or benefits team may help obtain plan documents but does not replace a timely formal appeal.

The National Association of Insurance Commissioners maintains a directory linking consumers to their state insurance department. A state consumer-assistance program, health-law advocate, or qualified attorney may also help with a high-value or medically urgent dispute.

Keep the appeal separate from other remedies

An ordinary coverage appeal is different from the federal independent dispute resolution process used for certain payment disputes under the No Surprises Act. Read what changed under the No Surprises Act to identify protections against qualifying surprise bills. Do not assume that opening a billing dispute, asking a provider to resubmit a claim, or negotiating a payment plan preserves your insurance appeal deadline.

For a wider map of billing, financial-assistance, negotiation, price-transparency, and insurance remedies, use the complete hospital bills and patient rights guide.

Final appeal checklist

Before submitting, confirm that you have:

identified the denial reason and the plan provision at issue;
verified your specific deadline and appeal address or portal;
requested the insurer’s criteria and relevant claim records;
included a clear request for reversal and evidence answering the denial;
obtained a clinician’s letter when medical judgment is central;
kept a complete copy and proof of timely delivery; and
calendared the expected decision date and possible external-review deadline.

A persuasive appeal is specific, documented, and timely. Start with the plan’s exact reason, match every argument to evidence, and preserve the next level of review even while the provider or insurer is informally trying to resolve the claim.

Sources

This article provides general educational information, not legal, medical, or insurance advice. Plan terms and applicable law control.