If you're staring at a denial letter and wondering what to do next, you're not alone. But the part most people miss is this: there isn't one appeal. There are four. Filing the wrong one first can cost you weeks you may not have.
Knowing how to appeal an insurance denial starts with knowing which type fits your situation. Each one has its own deadline and its own job. We'll walk through all four, tell you when to use each, and give you one clear rule for what to file first.
Worth knowing before we get into it: almost no one appeals at all. Federal data on marketplace plans shows fewer than 1% of denied claims are ever appealed. The fact that you're looking into this puts you ahead.
Type 1: The internal appeal, your default first step
An internal appeal is a formal request asking your insurer to look at the denial again. It's the standard first move, and for most denials, it's where you start.
You have 180 days (six months) from the date you got the denial notice to file. That's the deadline that matters most, so check your letter for the date it was sent. Miss it, and you can lose the right to appeal at all.
Your appeal should include your name, claim number, and insurance ID, a clear statement that you're appealing the denial, and any supporting proof, like a letter from your doctor explaining why the care is needed.
Federal rules set the response clock. If you're appealing a service you haven't gotten yet, the insurer has 30 days to decide. For a service you've already received, it's 60 days. You'll get the decision in writing.
We don't cover the wording of the letter itself on this page. If you want help drafting it, read our guide to responding to your insurance coverage denial letter.
Type 2: The expedited appeal, when waiting is dangerous
An expedited appeal is a faster version of the internal appeal, built for situations where waiting could hurt you. Use it when waiting 30 or 60 days for a standard decision could seriously threaten your health or your ability to recover.
Think of someone waiting on a cancer treatment approval, or a patient denied a hospital stay they're in the middle of. In those situations, days matter.
Federal rules say a final decision must arrive as quickly as your condition requires, and no later than four business days of your request. You can also file your internal appeal and ask for an outside review at the same time, so you don't lose time waiting for one to finish before starting the next.
To request one, tell your insurer that your situation is urgent. A note from your doctor confirming the medical risk helps move things along.
Type 3: The external review, when someone outside your insurer decides
An external review puts the denial in front of an independent reviewer, not your insurer. This is the step that carries the most weight. The reviewer's decision is binding, so your insurer has to follow it.
You reach this step after your internal appeal comes back denied. Your final denial letter has to tell you how to request one.
Timelines here are firm. A standard external review is decided no later than 45 days after the request. An expedited one, for urgent cases, comes back within 72 hours. You generally have four months from your final internal denial to file.
This is often the step where a stalled claim finally moves. The decision is no longer up to the company that said no.
Type 4: The grievance, for service and conduct problems
A grievance is different from the other three. It's not about a coverage denial. It's a formal complaint about the quality of care or service you got.
File a grievance when the problem is how you were treated, not whether something is covered. A rude staff member, a clinic that won't return your calls, long waits for a callback, a doctor who dismissed your concerns. Those are grievances.
The line that trips people up: if your insurer refused to pay for something, that's an appeal. If your insurer treated you badly, that's a grievance. Same company, two different tracks.
A grievance won't reverse a denied claim. Filing one when you meant to appeal a coverage decision wastes the days you need. When you're unsure which situation you're in, an advocate can tell you fast, or a healthcare advocate can sort it with you.
Which appeal to file first
Start here: pull out your denial letter and answer two questions.
First, is your health at immediate risk? If waiting could seriously harm you, file an expedited appeal and request an outside review at the same time. Don't wait on the standard track.
Second, is this a coverage denial or a service complaint? If the insurer refused to pay or cover something, that's an internal appeal. If it's about how you were treated, that's a grievance.
For most people, the order is simple. Internal appeal first. If that's denied, external review next. Expedited appeal replaces the standard internal appeal only when health is on the line. A grievance runs on its own separate track, whenever a service problem comes up.
The mistake we see most: someone files a grievance about a bill or a coverage decision, waits weeks, then learns it was never the right form. Meanwhile the 180-day clock kept running. Getting the right appeal on the first try protects the time remaining on your appeal clock.
If you want the full step-by-step on responding to a denial, read our guide on what to do when your insurance denies your claim.
Frequently asked questions
How long do I have to appeal a denied health insurance claim?
You have 180 days (six months) from the date on your denial notice to file an internal appeal. That's the most common deadline. Check the letter for the date it was issued, then count from there. Some plans and situations differ, so read your specific notice. Your next step: find the denial date on your letter today and mark 180 days out on a calendar.
What's the difference between an appeal and a grievance?
An appeal challenges a coverage or payment decision, like a denied service or an unpaid claim. A grievance is a complaint about service or quality, like rude staff or long delays. A grievance won't overturn a denied claim, so filing the wrong one costs you time. If you're unsure which fits your situation, call your insurer's member services line and ask them to confirm which process applies.
Is an external review really binding on my insurer?
Yes. When an independent external reviewer rules in your favor, your insurer has to follow that decision. It's the strongest step in the process because the call no longer rests with the company that denied you. You reach it after your internal appeal is denied. Your final denial letter must include instructions for requesting an external review, so keep that letter and follow the steps it lists.
Can I file an appeal and an external review at the same time?
In urgent cases, yes. If your health is at serious risk, you can request an expedited internal appeal and an external review at the same time, so you're not waiting for one to finish before starting the next. For non-urgent denials, you generally complete the internal appeal first, then request external review if you're still denied. If your care is time-sensitive, tell your insurer directly and ask for expedited handling.
Your next step
Pull out your denial letter and look for two things: the appeal deadline, usually 180 days from the notice date, and whether your situation qualifies for expedited review. Those two answers decide which appeal you file first.
That's a lot to sort through when you're already stretched thin. Turnout takes this part off your plate. We read the denial, figure out which of the four appeals fits, and make sure the right one gets filed on time. You stay in the loop without carrying the whole process yourself.
Talk to an advocate today. You can also call us directly if you'd rather start with a conversation.
