How to Appeal a Health Insurance Denial, Step by Step

A health insurance denial can be upsetting, especially when you’re already managing appointments, paperwork, or a health condition. But a denial is not always the last word. You can ask the insurer to review its decision, and in some cases an independent reviewer can take a second look.

The process depends on what kind of coverage you have. Marketplace or other private insurance, employer plans, Medicare, and Medicaid each have different rules and deadlines. Use the instructions in your denial notice as your starting point, and get help promptly if the decision affects care you need soon.

A note before you start: This guide offers general information, not legal, medical, or insurance advice. Your plan documents, denial notice, and program rules determine which steps and deadlines apply.

Step 1: Read the denial notice and find the deadline

Start with the letter or Explanation of Benefits (EOB). Look for:

• What service, medication, or claim was denied
• The reason for the denial
• The plan rule or policy used to make the decision
• How to appeal, where to send the appeal, and the deadline
• Whether you can request an urgent review or an independent external review

A denial may say that a service is not medically necessary, isn’t covered under the plan, needs prior authorization, or requires more information. The reason matters: it helps you decide what evidence to gather and what questions to ask.

Deadlines vary. For many ACA-regulated plans, you generally have 180 days after receiving a denial to file an internal appeal. Some employer plans also provide at least 180 days, but check the plan’s appeal rules. Medicare and Medicaid use different processes. Don’t assume the same deadline applies to every kind of coverage.

If the notice is unclear, call the number on your insurance card and ask how to appeal, what deadline applies, and whether the deadline is based on the date the notice was sent or received. Write down the date, the name or ID of the person you spoke with, and what they told you. Follow up in writing when possible.

Step 2: Ask for the information behind the decision

You can ask the plan for the documents and policy language it relied on. Depending on your coverage, this may include the claim or authorization file, medical criteria, relevant plan provisions, and records from reviewers.

If you have an employer-sponsored plan, you can also request relevant claim records under the plan’s procedures. The U.S. Department of Labor explains appeal rights for many private-sector workplace plans in its guide to filing a claim for health benefits.

Read the denial reason alongside your records. For example, if the plan says it did not receive enough information, ask exactly what is missing. If it says the treatment does not meet medical-necessity criteria, ask for the criteria and discuss the denial with the treating clinician.

Step 3: Ask your clinician for supporting information

Your treating clinician may be able to explain why the requested service or medication is appropriate for your situation. Ask whether they can provide a letter or other documentation that responds directly to the plan’s reason for denial.

Helpful information may include:

• Your diagnosis and relevant history
• The treatment or service requested
• Why it is needed in your circumstances
• Treatments tried already and what happened
• How the requested care relates to the plan’s stated criteria

You do not need to write a medical argument on your own. Ask your clinician what they can provide and whether they can submit the appeal or support your submission. The insurer may require you to complete a form naming someone to act on your behalf.

Step 4: File an internal appeal

An internal appeal asks the insurance plan to reconsider its own decision. Follow the method and deadline in the denial notice. If the plan allows a written appeal, include:

1. Your name and member or policy number
2. The claim or authorization number
3. The service or medication at issue and relevant dates
4. The reason the plan gave for denying it
5. A clear statement that you are appealing the denial
6. Your explanation of why the decision should be reconsidered
7. Supporting records, clinician letters, and other relevant documents

Keep your explanation focused on the denial reason. If the plan says information is missing, identify the information you are submitting. If it says the service is not medically necessary, explain how the supporting documentation addresses the plan’s criteria.

Send copies, not irreplaceable originals. Keep a complete copy of your appeal and proof of delivery, such as a portal confirmation, fax receipt, or mailing record. HealthCare.gov’s guide to internal appeals explains the general process and record-keeping tips.

Step 5: Ask for an expedited decision if time matters

If waiting for a standard decision could seriously jeopardize your health or ability to regain maximum function, ask whether an expedited appeal is available. Tell the insurer clearly that you are requesting an urgent review, and ask your clinician to support the request if they consider it medically urgent.

For many ACA-regulated plans, urgent cases have faster timelines. The specific rules depend on your plan and circumstances. If the notice gives instructions for urgent appeals, follow them carefully. In some urgent situations, you may be able to request external review before completing every internal appeal step. HealthCare.gov describes this option on its internal appeals page.

An appeal does not guarantee that care will continue while the review is pending. Ask your provider and plan what to expect, including whether there are temporary options for maintaining care.

Step 6: Review the insurer’s answer and consider external review

The insurer should send a decision explaining whether it has changed its position. If it still denies the claim, read the next-step instructions in that decision. You may be able to ask for an external review, in which an independent reviewer examines certain kinds of denials.

External review is generally available for some denials involving medical judgment, such as medical necessity or whether a treatment is experimental. Eligibility and the process depend on the plan and state. The final denial notice should tell you how to request review and provide the contact information. For many ACA-regulated plans, the general federal timeframe to request external review is four months after receiving the final denial, but your notice and applicable rules control.

Learn more from HealthCare.gov’s guide to external review. If the decision concerns Medicare, Medicaid, or Marketplace eligibility rather than a private insurance claim, use the appeal process for that specific program instead.

Step 7: Keep the process organized, and get support

Appeals can involve several documents and multiple deadlines. A simple tracker can help. Record:

• The date of each notice and the deadline it lists
• Every call, message, and submission
• What you sent, how you sent it, and confirmation details
• The date you expect a response
• Any follow-up you still need to do

If the denial is urgent, the amount is significant, or you are unsure which rules apply, contact the relevant program or a qualified advocate. The U.S. Department of Labor’s Employee Benefits Security Administration can answer questions about many private-sector employer plans at 1-866-444-3272. For other plans, the denial notice may direct you to your state insurance department, Medicare, or your state Medicaid agency.

If sorting through forms, notices, and follow-up feels like too much, Ridgeline Care Network offers non-clinical support to help people organize paperwork, prepare questions, and identify next steps. Our benefits navigation and care coordination services are available virtually in North Carolina, South Carolina, Tennessee, Virginia, and Georgia. We can help make the process clearer, but we cannot determine coverage, provide legal or medical advice, or guarantee an appeal outcome. You don’t have to be neurodivergent to reach out; you can book a free initial consult or call (833) 732-6200.

A final checklist

Before you submit your appeal, make sure you have:

• Read the denial and confirmed the deadline
• Checked which appeal process applies to your type of coverage
• Asked for the policy information or records you need
• Gathered relevant supporting documents
• Followed the plan’s instructions and kept proof of submission
• Requested an urgent review if delay could seriously affect your health

A denial can feel like a dead end, but it may be a decision you can challenge. Taking one step at a time, and getting help when you need it, can make the process easier to manage.