Your Medigap Claim Got Denied — Here’s What That Actually Means
Most Medigap denials aren’t really Medigap denials. That sounds confusing, but bear with me, because this is the thing I see trip people up more than anything else.
When you have a Medicare supplement plan, the way the billing works is: Original Medicare pays first, then your Medigap insurer pays its share of whatever Medicare approved. So if your Medigap carrier denies a claim, there are really two different problems that could be causing it, and they require two completely different fixes.
Problem one: Medicare denied the underlying claim first, and your Medigap insurer is just following suit. Problem two: Medicare approved it, but your Medigap insurer is still refusing to pay their portion. The second situation is rarer and usually involves an administrative error. The first situation is where almost everyone’s energy should go, because if you fix the Medicare denial, the Medigap payment typically follows automatically.
So before you do anything else, pull your Medicare Summary Notice (MSN) if you’re on Original Medicare, or check your Explanation of Benefits (EOB) from your Medigap insurer. Figure out which of these two problems you’re actually dealing with. That one step will save you weeks of wasted effort.
The Medicare Appeals Process: Five Levels and Real Deadlines
Medicare has a formal five-level appeals process. Most people never make it past level two, and honestly, most valid claims get resolved by level one or two. Here’s what the process looks like and where you’re most likely to win.
| Level | Who Reviews It | Deadline to File | Decision Timeline |
|---|---|---|---|
| 1 — Redetermination | Your Medicare contractor | 120 days from denial | 60 days |
| 2 — Reconsideration | Qualified Independent Contractor (QIC) | 180 days from Level 1 denial | 60 days |
| 3 — ALJ Hearing | Administrative Law Judge | 60 days from Level 2 denial | 90 days |
| 4 — Appeals Council | Medicare Appeals Council | 60 days from Level 3 denial | 90 days |
| 5 — Federal Court | Federal district court | 60 days from Level 4 denial | Varies |
The 120-day window at Level 1 feels generous, but don’t sit on it. I’d recommend filing within 30 days if you can. You want this resolved, not hanging over you.
For a Level 1 Redetermination, you’re submitting a written request to the Medicare Administrative Contractor (MAC) that processed the original claim. You can find their contact information on your MSN. Include the claim number, the date of service, the reason you believe the claim should be paid, and any supporting documentation your doctor can provide. That last part matters a lot. A letter from your physician explaining why the service was medically necessary is worth more than almost anything else you can submit at this stage.
Level 2 is where things get more serious. The Qualified Independent Contractor is a separate entity from Medicare, specifically set up to provide a fresh review. At this point, if your case has any real merit, you want a paper trail that would convince a stranger who knows nothing about your health history. Think detailed clinical notes, test results, referral letters, and anything that shows the service wasn’t just reasonable, it was medically necessary for your specific situation.
Level 3, the ALJ hearing, has a dollar threshold. As of 2026, the amount in controversy must be at least $180 to request a hearing. For most people disputing a hospital stay or specialist visit, you’ll easily clear that bar. But if you’re fighting over a $40 lab charge, this is where the math starts to matter.
The Most Common Mistake People Make (and It Kills Their Appeal)
Here it is: people submit an appeal with no new information. They write a letter saying they disagree with the denial, include maybe a copy of the original claim, and wait. Then they’re shocked when it gets denied again.
I’ve seen this happen over and over. The appeals reviewer isn’t going to look at the same paperwork and suddenly decide differently. You need to give them a reason to change the outcome. That means new documentation, a medical opinion they didn’t have before, or a clear explanation of why the denial reason doesn’t apply to your situation.
Let’s say you’re a 67-year-old in Ohio who had a hospital stay after a fall, and Medicare denied part of it as “not medically necessary.” You write a letter saying you disagree. That’s not enough. What you need is a letter from your orthopedic surgeon explaining the complexity of your injury, documentation showing why inpatient care was required rather than outpatient observation, and ideally your discharge notes. That’s the kind of evidence that moves appeals forward.
The other big mistake is not involving your doctor early enough. Your physician has the most credibility in this process. They can write letters, provide clinical documentation, and sometimes even call the reviewer directly. A lot of patients feel awkward asking their doctor to help with a billing appeal, but most physicians do this regularly. Don’t hesitate to ask.
When the Problem Is Actually With Your Medigap Insurer
Okay, so let’s say Medicare paid their share and your Medigap insurer is still refusing to pay. This is a separate situation and needs a separate approach.
First, call the insurer and get them to explain the denial in writing if they haven’t already. Common reasons at this stage include: they claim the service isn’t covered under your plan, there’s a coordination of benefits issue, or there’s an administrative error on their end (wrong policy number, missing information, etc.). The administrative errors are actually pretty common and are usually the easiest to fix with a single phone call and a fax.
If it’s a coverage dispute, look at your Medigap policy document. Not the marketing brochure. The actual policy. Find the section that describes what your plan covers and compare it to what they’re denying. Plans like Plan G cover Medicare Part A coinsurance and hospital costs, Part B coinsurance, the first three pints of blood, Part A hospice care coinsurance, skilled nursing facility coinsurance, and the Part A deductible (which is $1,676 per benefit period in 2026). If what you’re being denied is clearly listed as a covered benefit, you have a straightforward case.
Every Medigap insurer is required by law to have an internal appeals process. Request a formal internal appeal in writing. If that fails, you can file a complaint with your state’s insurance commissioner. This is actually one of the more effective escalation paths people underuse. State insurance departments take complaints seriously, and insurers know it. A complaint filed through your state’s insurance department website often moves things faster than continuing to fight with the company directly.
You can also contact your State Health Insurance Assistance Program (SHIP). SHIP counselors are free, they’re independent, and they’ve seen every kind of denial situation. If you’re feeling overwhelmed by this process, a SHIP counselor is the first call I’d tell you to make.
Expedited Appeals: When You Need an Answer Fast
There’s one scenario that changes everything: you need care now, and it’s being denied in advance (called a prior authorization denial or a pre-service denial). In that case, you can request an expedited appeal, and the timelines collapse dramatically. For urgent situations, Medicare is required to give you a decision within 72 hours. For truly life-threatening situations, you can sometimes get a decision within hours.
This applies if you’re still in the hospital and they want to discharge you but you don’t think you’re ready. You have the right to request an expedited review from your Medicare Quality Improvement Organization (QIO) before you leave. If you’re discharged and then appeal, your options narrow. So if this is your situation, act immediately. Don’t wait until you’re home.
The phone number for your QIO should be in your hospital discharge paperwork, and Medicare’s website (medicare.gov) has a QIO locator by state. Keep that number handy if someone you care about is in the hospital and things aren’t going smoothly.
Bottom Line
If your Medicare supplement claim was denied, don’t just accept it and don’t just write a frustration letter with no new evidence attached. Figure out first whether Medicare or your Medigap insurer is the actual problem, then attack that specific issue with documentation, your doctor’s support, and a clear written argument. Most valid claims that get denied at the first level win on appeal when people come back with the right paperwork. And if you’re ever unsure, call your state’s SHIP counselor before you do anything else. That call is free, and it’s almost always worth it.
Frequently Asked Questions
Can my doctor help me appeal a Medicare claim denial?
Yes, and they should. Your physician’s documentation is often the most powerful evidence in an appeal, especially if the denial is based on medical necessity. Ask your doctor for a letter specifically addressing why the service was required for your condition. Most practices deal with this regularly and have a process for it.
What if I miss the appeal deadline?
Missing the deadline doesn’t automatically end your options, but it makes things harder. You can request a deadline extension if you have “good cause” for the delay, such as a serious illness or not receiving the denial notice. You’ll need to explain the reason in writing. That said, don’t count on leniency. Hit the deadlines if you possibly can.
Does appealing a denial affect my Medigap coverage?
No. Filing an appeal cannot result in your Medigap policy being cancelled or your premiums being raised. Those protections are built into federal law. Appeal without hesitation if you believe the denial is wrong.
What’s the difference between an MSN and an EOB?
Your Medicare Summary Notice (MSN) comes from Medicare and shows what Original Medicare paid or denied. Your Explanation of Benefits (EOB) comes from your Medigap insurer and shows what they paid on top of Medicare. If Medicare denied a claim, you’ll see it first on the MSN. If Medicare approved it but your Medigap insurer isn’t paying, the discrepancy shows up when you compare the two documents side by side.
