If you already have Medicaid and you become eligible for Medicare, yes, you need to enroll in Medicare. Medicaid is built to be the payer of last resort, so when you qualify for Medicare it expects Medicare to be in place and paying first. Enroll in both, and Medicare covers its share of a service while Medicaid picks up the deductibles, copays, and coinsurance Medicare leaves behind, plus services Medicare doesn’t cover at all. Skip Medicare and you lose that structure: Medicaid generally won’t step in to pay what Medicare would have covered, and you’ll owe a Part B late-enrollment penalty on top of it.
What Happens If You Skip Medicare
The trap is assuming Medicaid alone is enough. It usually isn’t, because Medicaid coordinates around Medicare rather than replacing it. For services both programs cover, Medicaid typically will not pay what Medicare would have paid had you enrolled. You end up with narrower coverage than you’d have with both.
There’s also a permanent price tag on delay. For every 12-month period you could have had Part B but didn’t sign up, your monthly premium rises by 10%, and that surcharge lasts as long as you have Medicare. With the standard 2026 Part B premium at $202.90 per month, a two-year delay adds roughly $40 per month, forever.1Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
If you qualify for a Medicare Savings Program, the late enrollment penalty generally goes away, and you get a special enrollment period to sign up for Part B without waiting for the annual open enrollment window.2Medicare.gov. Avoid Late Enrollment Penalties So a delay isn’t permanent damage if you can get into an MSP. But the cleanest path is to enroll in Medicare as soon as you’re eligible.
How the Two Programs Pay Together
People with both programs are called dually eligible beneficiaries. Medicare pays first for any service it covers. Medicaid then pays second, covering the deductibles, copayments, and coinsurance Medicare leaves.3Medicare.gov. How Medicare Works With Other Insurance
Medicaid also fills gaps Medicare doesn’t touch. The biggest is long-term custodial care. Medicare covers a skilled nursing facility stay only up to 100 days after a qualifying hospital stay and doesn’t cover ongoing help with bathing, dressing, or eating. Medicaid covers extended nursing home stays and home-and-community-based services for people who need long-term help.4Medicare.gov. Medicaid
Prescription Drugs
Once you have Medicare, your drug coverage moves to Medicare Part D rather than Medicaid. You’re automatically enrolled in a Medicare drug plan so there’s no gap during the transition. If Medicare doesn’t cover a particular prescription, Medicaid may still cover it in certain situations, giving you a layer of drug coverage people with Medicare alone don’t have.4Medicare.gov. Medicaid
Dual eligibles also qualify for Extra Help, which cuts Part D costs sharply. In 2026, if you’re institutionalized or receiving home-and-community-based services, you pay $0 for all drugs. With full Medicaid benefits and income at or below 100% of the federal poverty level, copays are $1.60 for generics and $4.90 for brand-name drugs. Between 100% and 150% of the poverty level, copays are $5.10 for generics and $12.65 for brand-name drugs. Once your total out-of-pocket drug spending reaches $2,100 in a calendar year, you pay nothing more for covered prescriptions for the rest of the year.5Centers for Medicare & Medicaid Services. Calendar Year 2026 Resource and Cost-Sharing Limits
Help Paying Medicare Costs Through Medicare Savings Programs
Medicare Savings Programs are state-run Medicaid programs that help low-income Medicare beneficiaries pay Medicare costs. They’re the main path to dual eligibility for many people. Which one you fit into depends on your income.
- Qualified Medicare Beneficiary (QMB) covers Part A premiums if you owe them, Part B premiums, and all deductibles, coinsurance, and copayments for Medicare-covered services. The 2026 income limit is $1,350 per month for individuals and $1,824 for married couples. The resource limit is $9,950 for individuals and $14,910 for couples.
- Specified Low-Income Medicare Beneficiary (SLMB) covers Part B premiums only. The 2026 income limit is $1,616 per month for individuals and $2,184 for married couples, with the same resource limits as QMB.
- Qualifying Individual (QI) also covers Part B premiums, at a slightly higher income cap. The 2026 income limit is $1,816 per month for individuals and $2,455 for married couples, with the same resource limits.
All three automatically qualify you for Extra Help on prescription drugs.6Medicare.gov. Medicare Savings Programs Alaska and Hawaii use slightly higher limits, and some states set their limits above the federal floor.
QMB Balance Billing Protection
If you’re in QMB, federal law bars all Medicare providers and suppliers from billing you for Part A and Part B cost-sharing. That covers deductibles, copayments, and coinsurance. A provider who accepts Medicare cannot send you a balance bill for those amounts. If a bill shows up anyway, your State Health Insurance Assistance Program (SHIP) can help you push back.7Centers for Medicare & Medicaid Services. Prohibition on Billing Qualified Medicare Beneficiaries
How to Apply
Applications go through your state Medicaid agency, not through Medicare. Most states accept them online, by mail, by fax, or in person. Bring proof of income (benefit statements or pay stubs), proof of assets (bank statements or life insurance policies), your Medicare card, and proof of where you live. Expect a decision within 45 days. If you don’t hear back, follow up with your state Medicaid office.8Centers for Medicare & Medicaid Services. Medicare Savings Program Application Instructions
If Your Income Looks Too High
Some people assume they earn too much for Medicaid and never apply. The picture is more nuanced than a single cutoff. The 2026 federal poverty level is $15,960 per year for an individual and $21,640 for a two-person household.9U.S. Department of Health and Human Services. 2026 Poverty Guidelines Medicaid limits for older adults and people with disabilities are often tied to these guidelines, but the specific numbers vary by state and program.
Even if your income exceeds standard limits, many states offer a medically needy or spend-down pathway. You subtract your medical expenses from your countable income, and if what’s left falls at or below the state’s medically needy income level, you qualify. Expenses that count toward the spend-down include health insurance premiums (Medicare premiums included), deductibles, copayments, and out-of-pocket costs for medical care recognized under state law.10Medicaid.gov. Medicaid State Plan Eligibility Handling of Excess Income – Spenddown
States set their own budget periods, from one to six months. In a one-month period, you have to meet the spend-down each month to stay eligible. In a longer period, the state multiplies both your income and the income standard by the number of months and calculates the difference; once your medical expenses cover that difference, Medicaid kicks in for the rest of the period. Not every state offers this pathway, so ask your state Medicaid agency whether it’s available.
Plan Options Once You Have Both
Dual Eligible Special Needs Plans
D-SNPs are Medicare Advantage plans built for people who have both Medicare and Medicaid. They combine both sets of benefits into a single plan with one card and a single care coordinator, which cuts down on the confusion of running two programs in parallel.11Centers for Medicare & Medicaid Services. Dual Eligible Special Needs Plans Nearly all D-SNPs include dental, vision, and hearing coverage and tend to offer more supplemental benefits than standard Medicare Advantage plans.
PACE
The Program of All-Inclusive Care for the Elderly is an option for people 55 and older who need a nursing-home level of care but want to stay in the community. As of early 2026, 200 PACE programs operate across 33 states and the District of Columbia. If you have both Medicare and Medicaid, you pay no monthly premium, no deductible, and no copayments for any drug or service your PACE care team approves.12Medicare.gov. Program of All-Inclusive Care for the Elderly PACE covers everything Medicare and Medicaid cover plus additional services the team determines you need, including adult day care, transportation, home care, dental work, physical therapy, and prescription drugs. Two catches: you must live in a PACE service area and your state must certify that you need nursing-home-level care. If you enroll in a separate Medicare drug plan after joining PACE, you’ll be disenrolled, so keep drug coverage inside the program.
Switching Plans During the Year
Dual eligibles get more room to change plans than typical Medicare beneficiaries. Starting in 2025, dual eligible individuals can switch Medicare Advantage or Part D plans once per month, replacing the old quarterly enrollment period. A separate Integrated Care enrollment period lets full-benefit dual eligibles move into a fully integrated D-SNP once per month as well.13Centers for Medicare & Medicaid Services. New Special Enrollment Periods for Dually Eligible and Extra Help-Eligible Individuals If a plan isn’t working, you don’t have to wait for fall open enrollment.
One Boundary Worth Knowing
Medicaid estate recovery is a separate issue from Medicare enrollment, but it matters for many dual eligibles because Medicaid often pays for long-term care. Federal law requires every state to seek repayment from the estates of deceased Medicaid beneficiaries who were 55 or older when they received benefits, or who were permanently institutionalized at any age.14Medicaid.gov. Estate Recovery Recovery applies to Medicaid spending, not Medicare. If you own a home and expect to need nursing home care through Medicaid, an elder law attorney can walk you through how your state handles it before any assets are at risk.