Medicare Balance Billing Rules: Who Can Charge You?
Not all providers are treated equally under Medicare billing rules. Your first step when you get a surprise bill is to figure out which category your provider falls into.
| Provider Type | Can They Balance Bill You? |
|---|
| Participating provider (accepts assignment) | No. They must accept Medicare's approved amount as payment in full. |
| Non-participating provider | Yes, but only up to 15% above the Medicare-approved amount (the "limiting charge"). |
| Opt-out provider | Yes, they can charge any amount, but must give you written notice before your visit. |
| Provider billing a QMB beneficiary | No. Balance billing QMB members is prohibited by federal law, regardless of the provider's status. |
If your provider accepts Medicare assignment, any bill above the Medicare-approved amount plus your standard copay or coinsurance is illegal. You do not owe it.
The No Surprises Act and Medicare: What It Covers
The No Surprises Act took effect January 1, 2022, and added an extra layer of protection for people with private insurance and Medicare Advantage plans. Key protections include:
- You cannot be billed more than your in-network cost-sharing amount for emergency services, even from out-of-network providers
- Out-of-network providers at in-network facilities (like anesthesiologists or radiologists) cannot bill you more than your in-network rate without your written consent in advance
- Air ambulance providers that participate in Medicare cannot balance bill you beyond your cost-sharing
In May 2026, the federal government finalized major reforms to strengthen the No Surprises Act's Independent Dispute Resolution (IDR) process, making it more efficient and transparent. These changes primarily affect disputes between insurers and providers, but they result in stronger enforcement and faster resolution of billing disputes that flow down to patients.
If you have Original Medicare (not a private plan), the No Surprises Act's private insurance provisions may not apply directly, but Original Medicare already has its own balance billing protections built into the program.
Step-by-Step: What to Do When You Get a Medicare Surprise Bill
Step 1: Do Not Pay the Bill Immediately
Wait before writing a check or entering a payment online. Paying the bill can be interpreted as accepting the charge, which may limit your ability to dispute it later. Give yourself time to review and verify.
Step 2: Review Your Medicare Summary Notice (MSN) or Explanation of Benefits (EOB)
Your Medicare Summary Notice (for Original Medicare) or Explanation of Benefits (for Medicare Advantage) shows exactly what Medicare was billed, what it approved, and what your share should be. Compare the bill you received to this document. If the provider is charging more than your MSN or EOB shows as your responsibility, you have grounds for a dispute.
You can access your MSN at MyMedicare.gov or by calling 1-800-MEDICARE (1-800-633-4227).
Step 3: Check Whether the Provider Accepts Medicare Assignment
Go to Medicare's online provider directory at Medicare.gov/care-compare and look up the provider. If they accept assignment, they agreed to accept Medicare's approved amount. They cannot charge you above your standard cost-sharing.
Step 4: Contact the Provider's Billing Department
Call the billing department directly and ask them to verify:
- Whether they accept Medicare assignment
- What their billing code is for the service provided
- Whether they submitted the claim to Medicare first before billing you
Many surprise bills are the result of billing errors, not intentional overcharges. A simple phone call resolves a significant number of cases. Ask for an itemized bill if you do not already have one.
Step 5: File a Complaint or Appeal
If the provider insists the bill is correct and you believe it is wrong, file a formal complaint.
For Original Medicare: Call 1-800-MEDICARE or submit a complaint through Medicare.gov. You can also contact your State Health Insurance Assistance Program (SHIP) for free counseling. Find your SHIP at shiphelp.org.
For Medicare Advantage: File an appeal with your plan directly. Your plan is required to review the bill and respond within set timeframes. If you disagree with the plan's decision, you can escalate to an Independent Review Entity (IRE).
For No Surprises Act violations: Contact the No Surprises Help Desk at 1-800-985-3059 (available 24 hours a day, 7 days a week, including holidays). You can also submit a complaint online at CMS.gov.
Step 6: Request a Good Faith Estimate (If Uninsured or Self-Pay)
If you are uninsured or paying out of pocket, the No Surprises Act requires providers to give you a Good Faith Estimate before scheduled services. If your final bill is more than $400 above the estimate, you can request a patient-provider dispute resolution through CMS.
Step 7: Ask for Financial Assistance or a Payment Plan
If the bill is legitimate but you cannot afford it, ask the provider's billing department about:
- Financial hardship programs or charity care
- A no-interest payment plan
- A reduced settlement offer
Most hospitals and large medical practices have financial assistance programs that are not widely advertised.
QMB Protection: The Strongest Medicare Billing Shield Available
If you have low income and are enrolled in Medicare, the Qualified Medicare Beneficiary (QMB) program is one of the most powerful protections available. Under federal law, every Medicare provider and supplier is prohibited from billing QMB members for any Medicare Part A or Part B cost-sharing. This includes deductibles, copayments, and coinsurance.
This prohibition is absolute. Even if a provider does not participate in Medicaid, even if the state does not reimburse the provider for cost-sharing, they still cannot bill you. If a provider bills a QMB member and that member pays, the provider must refund the money.
2026 Medicare Savings Program Income Limits
| Program | Who It Covers | Monthly Income Limit (Single) | Monthly Income Limit (Married) | What It Pays |
|---|
| QMB (Qualified Medicare Beneficiary) | People at or below 100% FPL | $1,350 | $1,824 | Part A and B premiums, deductibles, copays, coinsurance |
| SLMB (Specified Low-Income Medicare Beneficiary) | People at 100 to 120% FPL | $1,616 | $2,184 | Part B premium ($185.00/month in 2026) |
| QI (Qualifying Individual) | People at 120 to 135% FPL | $1,820 | $2,458 | Part B premium |
| QDWI (Qualified Disabled and Working Individuals) | Working disabled people | $4,945 | $6,659 | Part A premium only |
Income limits shown are for the 48 contiguous states and DC. Alaska and Hawaii have higher limits. Asset limits also apply: $9,950 for individuals and $14,910 for couples.
Many states have eliminated or increased asset limits, so even if your savings exceed the federal thresholds, check your state's rules.
If You Are a QMB Member and a Provider Bills You
Report it immediately. You can:
- Call 1-800-MEDICARE
- Contact your State Medicaid office
- Submit a complaint to the No Surprises Help Desk at 1-800-985-3059
- Contact the Consumer Financial Protection Bureau (CFPB), which coordinates enforcement actions with CMS against providers who improperly bill QMB members
You are entitled to a refund. Do not accept the charge as your responsibility.
How to Apply for a Medicare Savings Program
If you are not already enrolled in a Medicare Savings Program and you think you might qualify, apply through your state Medicaid office. The process is separate from enrolling in Medicare itself.
Steps to apply:
- Gather your documents: Social Security card, Medicare card, proof of income (pay stubs, Social Security award letter), and bank statements for asset verification if your state requires it.
- Find your state Medicaid office at Medicaid.gov/state.
- Submit an application online, by mail, or in person at your local Medicaid office.
- If approved, your enrollment is retroactive to the month you applied in most states.
You can also use the Benefits Navigator free screener to check whether you may qualify for QMB or other Medicare Savings Programs before you apply.
Check Your Medicare Savings Program Eligibility
Common Medicare Billing Mistakes to Watch For
Billing errors are more common than most people realize. Before disputing a bill as intentional overcharging, check for these common mistakes:
- Duplicate billing: The same service billed twice
- Upcoding: A procedure coded at a higher level than what was actually performed
- Unbundling: Services that should be billed together billed separately to increase the total
- Services not rendered: Charges for tests or services you did not receive
- Incorrect patient information: Wrong Medicare ID number leading to claim denials that circle back to you as the patient
An itemized bill (not just a summary) will show each charge line by line. You have the right to request one.
When to Get Outside Help
Some surprise bill situations are complicated enough to warrant professional help. Consider contacting:
- State Health Insurance Assistance Program (SHIP): Free, unbiased Medicare counseling at shiphelp.org
- Medicare Rights Center: Free hotline at 1-800-333-4114, with counselors who specialize in billing disputes
- Legal aid organizations: Many offer free assistance for low-income Medicare beneficiaries dealing with improper billing
- State Insurance Commissioner: For Medicare Advantage disputes, your state insurance regulator can investigate plan conduct
Frequently Asked Questions
What is a Medicare surprise bill?
A Medicare surprise bill is an unexpected charge from a provider or facility after a Medicare-covered visit, often because the provider did not accept Medicare assignment, was out-of-network, or billed for services separately from the main facility charge. It can also refer to balance billing, where a provider charges more than Medicare's approved amount.
Can a Medicare provider balance bill me?
It depends on their status. Providers who accept Medicare assignment cannot balance bill you at all. Non-participating providers can charge up to 15% above Medicare's approved rate (the "limiting charge"). Providers who have opted out of Medicare can charge any amount, but must disclose this to you in writing before your visit.
What should I do first when I get an unexpected Medicare bill?
Do not pay immediately. Get your Medicare Summary Notice or Explanation of Benefits to compare what Medicare approved to what the provider is charging. Call the billing department to ask about the charge and whether they accept Medicare assignment. If the bill is incorrect, file a complaint with Medicare or your plan.
Does the No Surprises Act apply to Medicare?
The No Surprises Act's private insurance protections primarily apply to people with group or individual health plans and Medicare Advantage plans. Original Medicare has its own separate balance billing protections. Medicare Advantage members are protected under both sets of rules for emergency services and out-of-network providers at in-network facilities.
What is QMB and how does it protect me from surprise bills?
QMB stands for Qualified Medicare Beneficiary, a Medicare Savings Program for people with low incomes. Federal law prohibits any Medicare provider from billing QMB members for Part A or Part B cost-sharing, including deductibles, copays, and coinsurance. If you are billed as a QMB member, the provider must refund you and may face sanctions from Medicare.
How do I know if I qualify for QMB?
In 2026, the monthly income limit for QMB is approximately $1,350 for individuals and $1,824 for married couples (in most states), with asset limits of $9,950 for individuals and $14,910 for couples. Many states have more generous rules. Apply through your state Medicaid office or use the Benefits Navigator screener to check your eligibility.
Where do I file a complaint about an improper Medicare bill?
Call 1-800-MEDICARE (1-800-633-4227) for Original Medicare complaints. For No Surprises Act violations, contact the No Surprises Help Desk at 1-800-985-3059 or submit a complaint at CMS.gov. For Medicare Advantage disputes, file an appeal with your plan first, then escalate to an Independent Review Entity if needed.
Can I negotiate a Medicare bill down?
If the bill is legitimate and you cannot afford it, yes. Ask for an itemized bill, ask about financial assistance or charity care programs, and request a payment plan. Some providers will also accept a reduced lump-sum payment to close the account. This is separate from a formal dispute.
What if I already paid a surprise bill I should not have owed?
If you are a QMB member and paid a provider who was prohibited from billing you, the provider is legally required to refund that payment. Contact 1-800-MEDICARE to report the situation. If you have private insurance and paid a bill that should have been covered under the No Surprises Act, file a complaint with CMS and request a refund from the provider.
How long do I have to dispute a Medicare bill?
For Medicare Advantage plan decisions, you typically have 60 days from the date of the decision to file an appeal. For Original Medicare billing disputes, there is no strict deadline for contacting the provider, but formal appeals of claim decisions generally have a 120-day window. Do not wait. Start the dispute process as soon as you identify the problem.
