People who qualify for both Medicare and full-benefit Medicaid are known as dually eligible, and the combination changes who pays for what at nearly every point of care. Medicare pays first for anything it covers, and Medicaid pays second, picking up the state’s share of costs based on the level of Medicaid a person qualifies for. The result, for many dual-eligible households, is a Part B premium paid by the state, drug costs capped through automatic Extra Help enrollment, and little or nothing left to pay out of pocket.
What Full Medicaid Adds On Top Of Medicare
The Centers for Medicare & Medicaid Services describes this arrangement as being dually eligible, and it means that for a person with full-benefit Medicaid, the state pays the Medicare Part B premium every month. Depending on the level of Medicaid approved, the state may also cover the person’s share of Medicare deductibles, coinsurance and copayments, and it can cover a Part A premium too if one applies because someone didn’t earn enough work credits for premium-free coverage.
The order the two programs pay in is fixed and does not depend on which state a person lives in: Medicare pays first when a dual-eligible enrollee gets a Medicare-covered service, and Medicaid pays last, after Medicare and any other health insurance the person carries. Medicaid can also pay for services Medicare doesn’t cover at all, such as long-term nursing home care and personal care services, which sit outside the payment order entirely because Medicare never covers them in the first place.
Dual eligibility also triggers automatic enrollment in Extra Help for prescription drugs, and anyone additionally enrolled in the Qualified Medicare Beneficiary program cannot be billed at all by a Medicare provider for Medicare-covered services, items, deductibles, coinsurance or copayments, according to Medicare’s own description of dual eligibility.
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How Prescription Drugs Work For A Dual-Eligible Enrollee
Even though someone is enrolled in Medicaid, Medicare — not Medicaid — pays for prescription drugs once a person is dually eligible, and enrollment in a Medicare drug plan happens automatically if the person doesn’t already have one. If Medicare’s Part D plan doesn’t cover a specific prescription, Medicaid can sometimes still cover it, which keeps a gap from opening for drugs that fall outside the standard formulary.
Dual-eligible enrollees who are also in the Qualified Medicare Beneficiary program pay no more than $4.90 for each covered drug in 2026, a lower ceiling than the $12.65 that applies to Extra Help recipients who aren’t in QMB, based on Medicare’s 2026 cost-sharing limits for the Medicare Savings Programs.
Not everyone who gets some help from Medicaid reaches the broader protections described here. Someone enrolled only in a Medicare Savings Program such as QMB, SLMB or QI, without separately qualifying for full-benefit Medicaid, still gets real help — the state pays certain Medicare costs — but doesn’t receive the wider Medicaid benefits, like nursing home care or personal care services, that come with full Medicaid coverage. The distinction between a Medicare Savings Program alone and full-benefit Medicaid on top of Medicare is what separates partial relief from the fuller cost-sharing wipeout this article describes.
Choosing Coverage And What Stays Optional
Dual-eligible status doesn’t take away the choice of how to receive Medicare coverage — a person can keep Original Medicare or switch to a Medicare Advantage plan. Some Medicare Advantage plans are built specifically for dual-eligible enrollees, including Dual Eligible Special Needs Plans, Medicare-Medicaid Plans available only in certain states, and Program of All-Inclusive Care for the Elderly plans that can help someone get care outside of a nursing home.
Because Medicaid eligibility rules differ by state, the exact level of help — and which costs beyond the Part B premium get covered — depends on where a person lives and which category of Medicaid they qualify under. A state Medical Assistance office makes that determination and can explain which costs are covered before a person picks a Medicare plan for the year.
Some states also let a person “spend down” income above the Medicaid limit by paying qualifying medical expenses, including Medicare premiums and deductibles, until income falls low enough to qualify. That option means a person who appears over the income limit at first glance may still become dually eligible after documenting enough medical spending in a given period, even without a change in actual income, though the paperwork for a spend-down typically has to be repeated each time the qualifying period resets.
For a household living on Social Security alone, the combined effect of a paid Part B premium, waived cost-sharing under QMB, and a $4.90 drug ceiling can turn a fixed income that barely covers medical bills into one with almost no unpredictable medical costs left in it.
None of this is automatic simply because someone is old or has a low income — Medicaid eligibility still has to be established through a state application, and the level of Medicaid approved determines exactly which Medicare costs disappear. Medicare’s own guidance is direct on this point: the protections apply to people who have full-benefit Medicaid coverage, not to people who assume they qualify without ever applying.
The Paperwork Gap Between Qualifying For Medicaid And Seeing It Pay Medicare Bills
Knowing that dual eligibility can erase most Medicare cost-sharing doesn’t say which Medicaid category a household falls under, which state office handles the application, or what to do if a provider bills incorrectly after approval. Those specifics vary by state and rarely appear in the same place as the federal rules that describe the benefit.
The Medicare Cost & Coverage Protection Kit includes the 51 state Medicare cost-help packs and the prior-authorization appeal steps, covering both the state-level contacts and what to do if a provider bills incorrectly after approval.
Open a state’s Medicare cost-help pack in The Medicare Cost & Coverage Protection Kit.
This article was researched and drafted with the assistance of AI and reviewed by The Money Overview editorial team.
