QMB Protection Ends When Medicaid Ends. Check the Date of Service Before You Bill a Dual-Eligible Patient.

In today's MLN Connects, CMS published a short item for every practice that sees Medicare patients who also have Medicaid. If a dually eligible patient's loss of Medicaid includes removal from the Qualified Medicare Beneficiary (QMB) group, that patient "will no longer be eligible for the cost sharing protections required for QMBs." Medicaid also stops paying as the secondary payer.

CMS's instruction is simple. Before you bill or collect cost sharing, check three things: current Medicaid eligibility, current QMB status and the coverage that applies. The reason is a federal law change that took effect on October 1, 2026.

What changed on October 1

Section 71109 of Public Law 119-21, which CMS calls the Working Families Tax Cut legislation, added section 1903(v)(5) to the Social Security Act. From October 1, 2026, federal Medicaid funding for noncitizens is generally limited to three groups: lawful permanent residents (green card holders), Cuban/Haitian entrants and Compact of Free Association (COFA) migrants. U.S. citizens and nationals are not affected.

Other qualified noncitizens, such as refugees, asylees, parolees and victims of trafficking, lose federal funding for full Medicaid unless they hold another status that qualifies. Emergency Medicaid continues.

The limit is not only about full Medicaid. CMS's April 8, 2026 letter to state Medicaid directors says it also covers partial benefits, and it names the Medicare Savings Programs. QMB is one of those programs. A dual-eligible patient in one of the affected groups can therefore lose QMB status while keeping Medicare.

The change does not happen on one day

States must first try to re-verify each affected person's immigration status electronically. If they cannot, they ask the patient for information and give a reasonable time to answer. Before ending coverage, they must send advance notice of at least 10 days, with the right to a fair hearing.

That means QMB status will end on different dates for different patients, in different months, and some patients will keep it because they hold a qualifying status. A patient's status in September tells you nothing about November. Medicare entitlement itself is a separate step: CMS says Medicare terminations under the new rules come later, after this Medicaid change is in place.

What the QMB rule still requires

The billing prohibition has not changed. Every Original Medicare and Medicare Advantage provider, not only those enrolled in Medicaid, must not bill a QMB for Part A or Part B deductibles, coinsurance or copayments. That holds even when Medicaid pays nothing, and a QMB cannot choose to pay. Billing a QMB breaks your Medicare provider agreement and can lead to sanctions.

The protection follows the date of service. CMS's fact sheet says the protections "apply to all dates of service on which a patient is a QMB." So when a patient's QMB status ends, cost sharing for services after the end date may be billable. Cost sharing for services before it is not, even if the claim is still open, even if the patient has since lost Medicaid.

Where practices get this wrong

Four mistakes are likely in the coming months:

• Billing old balances after the status ends. A November eligibility check that shows no QMB does not make an August coinsurance balance collectable.
• Assuming everyone lost coverage. Lawful permanent residents keep federal Medicaid, and some patients will keep QMB under another status. Check each patient; never decide from a patient's country of origin or a guess about their status.
• Checking once a year. With states ending coverage on a rolling basis, the check has to happen at each visit for dual-eligible patients.
• Leaving the crossover claim alone. When Medicaid is no longer secondary, a claim that used to cross over to the state will come back unpaid, and the balance needs a new decision, not an automatic statement.

A front-desk check for this month

This is general information, not legal advice. A practice can start here:

• Pull a list of patients flagged as QMB or dual eligible in your practice management system.
• At each visit, check Medicare eligibility through HETS, your MAC's portal or your clearinghouse, and confirm the QMB indicator and dates, not just Medicare Part B.
• Check the state Medicaid eligibility system for the same date of service.
• Record the date QMB ended in the patient's account, and set your system so cost sharing is held for any service before that date.
• Before sending a statement to a former QMB, compare each line's date of service with the QMB end date.
• For Medicare Advantage patients, ask each plan how it reports QMB status to you; CMS leaves that to the plan.
• If a QMB was billed or paid by mistake, recall the bill or the collection account and refund the patient.

Patients who receive a notice from their state may ask your staff what it means. The kind answer is to point them to the state Medicaid office or their local State Health Insurance Assistance Program, not to guess.

Check the date, then the balance

This change will produce two kinds of errors: balances billed to patients who are still protected, and cost sharing written off for patients who no longer are. Both come from the same missing step, a check of QMB status for the actual date of service. If you want a second view of how your dual-eligible balances are handled, a revenue review is a place to start.