When your insurer denies a medical procedure, you have a legal right to appeal that decision, and a surprising number of appeals succeed. The process takes time and paperwork, but knowing the exact steps keeps you from giving up on a claim that might be overturned.
Why insurers deny procedures in the first place
Most denials fall into a handful of categories. The insurer says the procedure is not medically necessary, that you did not get prior authorization, that an out-of-network provider was used, or that the service is listed as experimental or investigational. Understanding the exact reason matters because your appeal has to address that specific objection, not just argue that you need the procedure.
Your denial letter is the starting document for everything. Under the Affordable Care Act, insurers are required to send a written denial that names the reason, cites the specific plan provision used, and explains how to appeal. If your letter is vague, you can call your insurer and ask for the clinical criteria used to make the decision. They are required to give it to you.
According to the Kaiser Family Foundation, insurers on the ACA marketplace denied roughly 17% of in-network claims in 2021, and consumers appealed fewer than 1% of those denials. Most people walk away from cases they might have won.
The internal appeal process, step by step
An internal appeal goes back to your insurance company. You are asking them to have a different reviewer look at the decision. For most plans, you have 180 days from the date of the denial letter to file, though your specific plan documents may set a shorter window, so check that first.
Start by gathering these documents before you write a single word of your appeal letter.
- The denial letter with the specific reason and plan provision cited
- A letter from your doctor explaining why the procedure is medically necessary, written to address the insurer’s exact objection
- Relevant medical records, test results, and imaging that support the diagnosis
- Peer-reviewed clinical guidelines or published treatment protocols that back your doctor’s recommendation
- Any prior authorization reference numbers if authorization was denied or allegedly not obtained
Your appeal letter should be direct. State the procedure, the denial date, your member ID, and then make the medical case using your doctor’s letter and the clinical evidence. If the denial cited a plan exclusion, quote the plan language back and explain why it does not apply to your situation. Keep it to one or two pages and attach everything as labeled exhibits.
Send the appeal by certified mail or through your insurer’s secure member portal so you have a timestamp. Insurers are required by federal law to decide most internal appeals within 30 days for pre-service claims and 60 days for post-service claims. Urgent care appeals have a 72-hour turnaround requirement.
What an external appeal is and when to use it
If the internal appeal fails, you can take your case to an independent external reviewer. This is a major protection added by the ACA. The external reviewer is a medical professional with no financial relationship to your insurer, and their decision is binding on the insurance company in most states.
You can request an external appeal after your internal appeal is denied, or in some situations, you can skip the internal process entirely if your insurer agrees or if the denial involves urgent care. Which process applies depends on your plan. Most individual and fully insured plans go through your state insurance department, while many self-funded employer plans use a federal process instead. HealthCare.gov explains how to tell which one covers you.
External reviewers overturn insurer decisions at a meaningful rate. A Kaiser Family Foundation review of state external review programs found that reviewers overturned insurer denials about 45% of the time on average, with wide swings from state to state. That is not a guarantee, but it is a real number worth knowing before you give up.
When the appeal process takes too long or fails
Some procedures are time-sensitive. An appeal can take months, and a failed external review can leave you back at square one with a condition that has not been treated. At that point, many patients start looking at the actual out-of-pocket cost of paying directly.
Self-pay pricing in the US is often high, but the same procedures in Mexico, Costa Rica, and Panama can cost 40-70% less than US out-of-pocket rates across dental work, hair restoration, fertility treatments, and aesthetic procedures. Our treatment cost comparison table shows the ranges side by side. The savings are large enough that some patients come out ahead financially compared to paying US cost-sharing amounts even on a plan that covers part of the bill.
If your US out-of-pocket after insurance would be $8,000 and the same procedure abroad with a reputable provider runs $2,500 to $3,500, the math is straightforward. Travel costs are real, but they are one-time and often modest next to the price difference. We cover that side of the decision in what going abroad for care looks like after a denial.
If you are at the point of weighing that option, MedEscape connects US and Canadian patients with screened providers in Mexico, Costa Rica, and Panama across dental, hair restoration, fertility, and aesthetic medicine categories.
Practical moves that improve your odds at every stage
Get your doctor involved early and specifically. A letter that says “this procedure is medically necessary” rarely wins. A letter that says “this patient has failed two prior conservative treatments documented in the attached records, and the published guidelines from the relevant specialty society recommend this intervention at this stage” is a different document entirely.
Use your state insurance commissioner. Every state has one, and most have consumer assistance programs that will review your denial letter, help you understand your rights, and sometimes intervene directly with the insurer. This service is free. The federal government’s HealthCare.gov and CMS resources can point you to your state’s program.
Document every phone call. Write down the date, the name of the representative, and a summary of what was said. Ask for a reference number for each call. This record can matter if you later need to show that the insurer gave you incorrect information about the appeal process.
If the dollar amount is large and the denial seems clearly wrong, a patient advocate or healthcare attorney is worth considering. Private patient advocates usually charge hourly or flat fees, and some nonprofit legal organizations assist with insurance disputes at no cost. The Patient Advocate Foundation is one place to start that search.
Frequently asked questions
How long do I have to appeal an insurance denial?
For most plans covered by the ACA, you have 180 days from the date of the denial letter to file an internal appeal. Some employer-sponsored plans may set a shorter deadline in the plan documents, so read your Summary Plan Description carefully. Missing the deadline typically means losing your right to appeal under that claim.
Can my doctor appeal on my behalf?
Yes. A physician or other authorized representative can file an appeal for you with your written consent. In some cases, particularly when the denial is based on medical necessity, having your doctor file directly and attach their clinical reasoning can carry more weight than a patient-filed appeal alone.
What happens if I lose the internal appeal?
You can request an external appeal through an independent review organization. Depending on your plan, that review runs through your state insurance department or a federal process. The external reviewer’s decision is legally binding on the insurer.
Is it worth appealing if the procedure is only partially covered?
Sometimes. If the denial is about a specific service within a larger treatment plan, or if the insurer miscoded the procedure, an appeal can fix the coverage determination. If the procedure simply falls below your deductible, an appeal may not change your out-of-pocket cost and it makes more sense to focus on negotiating the provider’s cash-pay rate or exploring lower-cost alternatives.
When does medical tourism make more financial sense than continuing to fight a denial?
When the procedure is time-sensitive, the appeal timeline is long, and the out-of-pocket cost in the US exceeds what you would pay abroad for comparable care. For procedures in dental, hair restoration, fertility, and aesthetic medicine categories, patients traveling to Mexico, Costa Rica, or Panama routinely save 40-70% compared to US self-pay rates. That savings can exceed what insurance would have covered anyway after deductibles and cost-sharing.