QMB Protection: When Medicare Providers Can't Bill You
If you're in the Qualified Medicare Beneficiary (QMB) program, a bill for a Medicare deductible or copay usually shouldn't exist at all. Federal law says Medicare providers, suppliers and even pharmacies can't charge you for Part A or Part B cost sharing on covered care. Yet CMS says QMB enrollees still get billed, and many pay because they don't know the rule or don't want to upset a doctor. Here's what the protection covers, what it doesn't, and how to get a wrong bill cancelled or refunded.
QUICK FACTS
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What QMB pays for
QMB is a Medicaid eligibility group. Through it, your state pays your Medicare premiums and your Medicare cost sharing. Medicare.gov says QMB helps pay Part A premiums (if you don't have premium-free Part A) plus Part B premiums, deductibles, coinsurance and copayments for services and items Medicare covers. CMS says more than 8 million people, over 1 in 8 people on Medicare, were in the QMB group in 2023.
There are two flavors, and the difference matters later:
QMB Only: your state covers your Medicare premiums and cost sharing, but you don't get other Medicaid benefits.
QMB Plus (QMB+): you get the QMB help and full Medicaid coverage.
Either way, CMS's dual-eligible fact sheet says that even if Medicaid doesn't fully cover a Medicare charge, the QMB enrollee "isn't liable for them."
The 2026 limits
These are the federal monthly limits Medicare.gov lists for 2026. Income limits are slightly higher in Alaska and Hawaii, and some states use higher limits or don't count certain income or resources, so apply even if you're a bit over.
Program | What it helps pay | Income limit, individual | Income limit, couple | Resource limit, individual / couple |
|---|---|---|---|---|
QMB | Part A and B premiums, plus deductibles, coinsurance, copays | $1,350 | $1,824 | $9,950 / $14,910 |
SLMB | Part B premium only | $1,616 | $2,184 | $9,950 / $14,910 |
QI | Part B premium only (apply every year) | $1,816 | $2,455 | $9,950 / $14,910 |
Only QMB comes with the billing protection. SLMB and QI pay your Part B premium, but you still owe the usual deductibles and coinsurance. Everyone in these three programs also gets Extra Help with drug costs, which caps each covered drug at $12.65 in 2026.
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The billing rule, in plain terms
CMS's provider fact sheet (MLN7936176, September 2025) puts it bluntly: providers and suppliers, including pharmacies, "must not bill" QMB patients for Part A or Part B cost sharing. A few details people often miss:
It covers every Medicare provider. The rule applies to all Original Medicare and Medicare Advantage providers and suppliers, "not only those that accept Medicaid." A doctor who doesn't take Medicaid patients still can't bill you.
It applies even when Medicaid pays nothing. Many states limit how much they pay toward Medicare cost sharing. The provider may get less, but that shortfall isn't yours. CMS says Medicare and Medicaid payments, plus any Medicaid copay, are treated as payment in full.
You can't opt in to paying. CMS says QMB enrollees "may not elect to pay" Medicare deductibles, coinsurance and copays. If an office asks you to sign something agreeing to pay your 20%, that doesn't change the rule.
State lines don't matter. A provider can't charge you even if your QMB benefit comes from a different state than the one where you got care.
Part B drugs are included. CMS's billing FAQ says the protection covers Part B-covered prescription drugs.
Medicare Advantage counts too. Federal law has protected QMB enrollees in Medicare Advantage and other Part C plans since 1997, according to a 2024 CMS memo to plans.
Medicare beneficiaries enrolled in the QMB group have no legal obligation to pay Part A or Part B deductibles, coinsurance, or copayments for any Medicare-covered items and services. (CMS, Qualified Medicare Beneficiary Program page)
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What you can still be charged
The protection is broad, but it has edges. Knowing them helps you spot which bills are wrong.
Charge | Can a provider bill you? | Why |
|---|---|---|
Part A or B deductible, coinsurance or copay for covered care | No | This is exactly what the QMB rule bans |
Small Medicaid copayment | Yes, if your state has one | CMS and Medicare.gov both say QMB enrollees may owe a small Medicaid copay |
Part D prescription copays at the pharmacy | Yes | The ban covers Parts A and B only; pharmacies can collect the Low Income Subsidy copay |
Service Medicare never covers (QMB Only) | Yes, the full cost | CMS says a provider could bill a QMB Only enrollee for statutorily excluded services |
Service Medicare never covers (QMB Plus) | Only if Medicaid also won't cover it | Medicaid may pay if your state covers it and the provider takes Medicaid |
Care Medicare denies as not medically necessary, after you signed an ABN | Only after Medicare and Medicaid both decide | See below |
The Advance Beneficiary Notice (ABN) wrinkle
Sometimes a provider expects Medicare to deny a service as not medically necessary and asks you to sign an ABN. CMS has special rules for people with QMB or Medicaid:
The provider must tell you to check Option Box 1, so the claim goes to Medicare.
Even though the form says you may be asked to pay now, the provider can't bill you when the ABN is given. It must wait until both Medicare and Medicaid process the claim.
Only then can it shift the cost to you, and only in narrow cases. For QMB Only, that's when Medicare denies the claim. For full Medicaid, Medicaid must also deny or not pay, subject to any state law limiting what you owe.
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Make sure every office knows you're a QMB
Many wrong bills happen because the front desk or billing vendor never flagged your status. Medicare.gov's advice is simple:
Show both cards every time. Bring your Medicare card and your Medicaid card (or QMB card) to every visit.
Carry a Medicare Summary Notice (MSN). If you have Original Medicare, your MSN states that you're in the QMB program and shouldn't be billed. Since July 2018, CMS says, MSNs show QMB status and $0 cost sharing for the months you're enrolled.
Go electronic. If you log into (or create) your Medicare.gov account and sign up for electronic MSNs, you'll get an email link any month you have a processed claim, instead of waiting 4 months for a paper copy.
In a Medicare Advantage plan? Ask your plan how it shows QMB status. CMS urges plans to put it on member ID cards, provider portals and Explanation of Benefits statements, but it doesn't require a specific method.
Providers have their own tools, too. CMS tells offices to check QMB status through Medicare's eligibility system (HETS), their contractor's portal, Medicare remittance notices, or the state Medicaid eligibility system. Billing staff may recognize the remittance alert codes N781 (deductible) and N782 (coinsurance), which say the patient is a QMB.
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Got a bill anyway? Do this
STEPS TO STOP A WRONG BILL
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Keep copies of everything: the bill, your letter, your card, your MSN and notes from each call (date, name, what they said). If you're in a Medicare Advantage plan, call the plan too. CMS's 2024 memo says plans may face compliance action if they don't make sure wrongly collected amounts are refunded, and they must act to stop improper QMB billing that's brought to their attention.
Providers can't turn you away for being a QMB
CMS's memo to Medicare Advantage plans reminds them to teach network providers about "their obligation not to discriminate against QMBs by refusing service because they are protected from paying cost sharing." If a plan provider refuses to see you for that reason, report it to the plan and to 1-800-MEDICARE.
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How providers get paid instead
It helps to know the provider isn't simply out of luck, because it gives you something to point to. Providers can bill your state Medicaid program for Medicare cost sharing, even if they don't otherwise take Medicaid. CMS says states must let any Medicare-enrolled provider enroll just to process these claims. In nearly all states, Original Medicare claims "cross over" to Medicaid automatically. Some hospitals and other facilities can also claim unpaid amounts as Medicare bad debt once the state has processed the claim.
So the polite version of your message to a billing office is: "I'm a QMB. Please bill Medicaid for the cost sharing and remove the balance from my account."
Not in QMB yet?
If your income is near the limits in the table, apply through your state Medicaid office. Medicare.gov says your state decides which Medicare Savings Program you qualify for, and you should apply even if you don't think you'll qualify. Our guide to Medicare Savings Programs explains the application.
Related guides
Official sources
Last checked: October 30, 2026. Facts come from CMS's QMB page, MLN fact sheets, billing FAQ and 2024 plan memo, and Medicare.gov's Medicare Savings Programs page and QMB tip sheet.
Income and resource limits change every year, and states can set higher ones. Confirm your status and limits with your state Medicaid office.
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