Medical Reasons

Medicare Denied Claim as Experimental Treatment

Name: Medicare Denied Claim as Experimental Treatment
Creator: Barley Billing Team
Published: 2026-03-26

Written by Barley Billing Team, Medicare Billing Experts | Last reviewed March 26, 2026

Does your notice say something like this?

"This service is not a covered benefit under Medicare"

"Medicare does not cover experimental or investigational services"

"This item or service is not covered because it has not been approved"

If so, you're in the right place. Here's what it means and what to do.

What This Means

Medicare reviewed your claim and determined that the service or treatment is considered experimental or investigational. In Medicare’s view, the treatment has not yet been proven safe and effective through enough research to be considered a standard, accepted medical practice.

This does not necessarily mean the treatment is unsafe or will not help you. It means Medicare’s coverage rules do not yet include it.

Why This Happens

The treatment is not FDA-approved for your condition. A drug or device may be approved for other uses but not for the condition listed on your claim.
Medicare has no National or Local Coverage Determination for the service. Medicare relies on coverage policies (NCDs and LCDs) to decide what is covered. If a service is not addressed in these policies, or is explicitly excluded, it may be denied as experimental.
The treatment is part of an ongoing clinical study. Services that are still being evaluated in clinical trials are generally not covered, though routine care costs during a qualifying trial may be.
There is not enough published evidence. Even if some doctors support the treatment, Medicare may consider it experimental if it lacks large-scale peer-reviewed studies.

Should You Appeal?

Appeal outlook: Weak

Experimental or investigational denials are among the hardest to overturn. Medicare’s exclusion of experimental services is written into the law (Social Security Act, Section 1862(a)(1)(A)), and appeals require showing that the service is actually accepted by the broader medical community despite Medicare’s classification.

That said, appeals can succeed in specific situations – for example, if the service was miscategorized as experimental when it is actually an accepted standard of care, or if the denial was for routine costs associated with a qualifying clinical trial that Medicare should have covered.

What To Do Next

Read your denial notice carefully. Look for the specific reason the service was called experimental. This will help you understand whether the denial might be based on a coding error or a genuine coverage exclusion.
Talk to your doctor. Ask whether published peer-reviewed studies or clinical practice guidelines support this treatment as a standard of care. If so, your doctor’s help will be critical for any appeal.
Check if you qualify for a clinical trial exception. Medicare covers routine care costs in qualifying clinical trials. If your treatment is part of such a trial, the routine costs (like lab tests, imaging, and doctor visits) should be covered even if the experimental treatment itself is not.
Consider filing an appeal if there is a reasonable basis. If your doctor believes the service is standard care that was mislabeled, or if routine clinical trial costs were wrongly denied, submit an appeal with supporting medical literature.
Look into other coverage options. Some treatments may be covered under a manufacturer’s compassionate use program or a clinical trial at no cost to you. Ask your doctor about these options.

Sources

Want us to review your denial for free? Send us your notice and we'll tell you if it's worth appealing →

Appeal Deadlines — Check Your Notice for Exact Dates

Original Medicare

120 days from the date on your MSN

Medicare Advantage

At least 60 days (check your denial notice for exact deadline)

Not sure which you have? Check the top of your denial notice. If it names a private insurance company (like Humana, UnitedHealthcare, or Aetna), you have Medicare Advantage. If it says "Centers for Medicare & Medicaid Services," you have Original Medicare.

Frequently Asked Questions

What does 'experimental or investigational' mean?

It means Medicare has determined that the treatment or service has not been proven safe and effective through enough scientific evidence to be considered standard medical care. This can include new drugs, devices, or procedures that are still being studied.

Does Medicare cover anything related to clinical trials?

Yes. While Medicare generally does not cover the experimental treatment itself, it does cover routine patient care costs in qualifying clinical trials. This includes doctor visits, hospital stays, and tests you would have needed even without the trial. If you were denied for costs related to a qualifying clinical trial, you may have grounds to appeal.

Can my doctor help me appeal?

Yes. Your doctor can provide published medical literature, peer-reviewed studies, or clinical guidelines showing the treatment is accepted by the medical community. This evidence is the strongest basis for an appeal, though overturning experimental denials remains difficult.

What if my condition is life-threatening and no other treatments are available?

If you have a terminal illness and standard treatments have not worked, you may have additional options. Some Medicare Advantage plans are required to cover experimental treatments for terminal conditions under certain circumstances. Ask your doctor about qualifying clinical trials, which Medicare may help cover.

Want Us to Check Your Denial?

Send us your denial notice and we'll review it for free. We'll tell you if it's worth appealing and exactly how to do it.

This information is for educational purposes only and is not legal or medical advice. Always verify with your doctor's office and insurance company.