Medicare and Medicaid work together by splitting responsibilities: Medicare acts as the primary payer for medical bills, covering hospital stays, doctor visits, and prescriptions, while Medicaid picks up costs that Medicare leaves behind, including premiums, copays, deductibles, and services Medicare doesn’t cover at all (like long-term nursing home care). People enrolled in both programs are called “dual eligibles,” and for them, the two programs coordinate so that out-of-pocket costs drop to near zero.
Who Pays First
When you have both Medicare and Medicaid, Medicare always pays first. This is called coordination of benefits. Your healthcare provider submits the claim to Medicare, which pays its share. Whatever Medicare doesn’t cover, the remaining balance goes to Medicaid for potential payment. You generally owe nothing or close to nothing out of pocket.
The system is enforced on the back end by Medicare Administrative Contractors, which process claims and check federal databases to verify payer order. If their systems show that another insurer (including Medicaid) should be billed differently, the claim gets routed accordingly. For dual eligibles, though, the sequence is straightforward: Medicare first, Medicaid second.
What Medicaid Covers That Medicare Doesn’t
Medicare has real gaps, and Medicaid fills the biggest ones. The most significant is long-term custodial care. Medicare covers skilled nursing facility stays only for a limited period after a hospital admission, and it doesn’t cover ongoing nursing home residence for people who need help with daily activities like bathing, dressing, and eating. Medicaid does. For dual eligibles who need years of nursing home care, Medicaid is the program that pays for it.
Medicaid also covers personal care services, which include in-home aides who help with daily tasks. Many state Medicaid programs add dental, vision, hearing, and transportation benefits that Medicare either doesn’t cover or covers only in limited circumstances. The exact package varies by state, since each state runs its own Medicaid program within federal guidelines.
How Medicaid Helps Pay Medicare’s Costs
Even for services Medicare does cover, dual eligibles often face premiums, deductibles, and copays. Medicaid can pick up those costs through Medicare Savings Programs, which come in four tiers based on income.
- Qualified Medicare Beneficiary (QMB): The most comprehensive. Medicaid pays your Part A premiums (if applicable), Part B premiums, and all deductibles, coinsurance, and copays for Medicare-covered services. Income limit for an individual is $1,350 per month (2026), or $1,824 for a married couple, with assets up to $9,950 individually or $14,910 for couples.
- Specified Low-Income Medicare Beneficiary (SLMB): Covers Part B premiums only. Income can be up to $1,616 per month individually ($2,184 for couples), with the same asset limits as QMB.
- Qualifying Individual (QI): Also covers Part B premiums only. Income ranges from 120% to just under 135% of the federal poverty level, up to $1,816 monthly for an individual ($2,455 for couples).
- Qualified Disabled and Working Individual (QDWI): Covers Part A premiums only, for working disabled people with income up to $5,405 per month individually. Asset limits are lower: $4,000 for an individual, $6,000 for a couple.
These are federal floor amounts. States can raise them using income disregards, so your state may allow slightly higher income or assets than what’s listed here. All MSP income limits include a standard $20 monthly disregard.
Prescription Drug Benefits for Dual Eligibles
Prescription drugs are covered through Medicare Part D, but dual eligibles automatically qualify for Extra Help, a federal subsidy that eliminates most drug costs. Under Extra Help in 2026, you pay no monthly premium for your Part D plan and no deductible. Your copays are capped at $5.10 for generic drugs and $12.65 for brand-name drugs. Once your total drug spending reaches $2,100 for the year, you pay nothing for covered prescriptions.
If you’re in the QMB program and also have full Medicaid coverage, your copays are even lower: no more than $4.90 per covered drug. For people managing multiple chronic conditions with several daily medications, this benefit alone can save thousands of dollars a year.
Dual Eligible Special Needs Plans
One of the most practical ways Medicare and Medicaid work together is through Dual Eligible Special Needs Plans, or D-SNPs. These are Medicare Advantage plans designed specifically for people who have both programs. Instead of navigating two separate systems with different rules, provider networks, and paperwork, a D-SNP coordinates your Medicare and Medicaid benefits under one plan.
D-SNPs include built-in care coordination, meaning a team helps manage your appointments, specialists, and prescriptions. They tailor their covered drug lists and provider networks to the needs of dual eligibles. Many D-SNPs also offer supplemental benefits you wouldn’t get through original Medicare, such as transportation to medical appointments, extra hospital days for serious conditions like cancer or heart failure, and over-the-counter health product allowances. Integrated D-SNPs go further by combining Medicare and Medicaid benefits into a single, streamlined experience.
How to Qualify for Both Programs
You don’t apply for dual eligibility as a single status. You qualify for Medicare and Medicaid separately, and if you’re enrolled in both, you’re automatically considered dual eligible.
Medicare eligibility is federal and fairly uniform: you qualify at age 65, or earlier if you have a qualifying disability or end-stage kidney disease. Medicaid eligibility, by contrast, is managed at the state level. Income and asset limits vary by state, and some states have expanded Medicaid to cover more adults. For the Medicare Savings Programs specifically, each tier has its own income and asset thresholds, all tied to percentages of the federal poverty level.
To enroll in a Medicare Savings Program, you apply through your state Medicaid office. CMS provides a model application for Medicare premium assistance, but the process and forms differ by state. If you’re already receiving Medicaid and you turn 65 or become eligible for Medicare through disability, your state should coordinate the transition, though it’s worth confirming your enrollment status directly. If you’re already on Medicare and your income drops or your circumstances change, you can apply for Medicaid through your state at any time.
What Dual Eligibility Looks Like in Practice
For someone enrolled in both programs, the day-to-day experience of healthcare becomes significantly simpler and cheaper than having Medicare alone. You visit a doctor or hospital, and Medicare covers the bulk of the bill. The copay or coinsurance that would normally come to you gets picked up by Medicaid. If you need a prescription, you pay a few dollars at most. If you need long-term care that Medicare won’t touch, Medicaid steps in.
The complexity is mostly administrative, happening behind the scenes between the two programs. Providers submit claims to Medicare first, then bill Medicaid for the remainder. If you’re in a D-SNP, even that coordination is handled for you. The most important thing for dual eligibles is making sure both enrollments stay active, since losing Medicaid coverage means those cost protections disappear, and you become responsible for all the premiums, deductibles, and copays Medicare normally passes along to patients.