QMB vs. SLMB: What's the Difference? (2026 Guide)
If you are looking for help paying your Medicare costs, you have likely come across both QMB (Qualified Medicare Beneficiary) and SLMB (Specified Low-Income Medicare Beneficiary). While both are official Medicare Savings Programs (MSPs) administered by state Medicaid agencies, they differ dramatically in what they cover, income limits, and retroactive benefits.
Full Cost-Sharing Shield
Covers Part B premium ($202.90/mo), Part A premium, plus all deductibles, coinsurance, and copays. Providers are federally barred from billing you.
Savings: Up to $6,975/year
Part B Premium Relief
Covers your Medicare Part B premium only ($202.90/mo). You still pay regular Medicare deductibles and copayments.
Savings: $2,435/year
Side-by-Side Comparison: QMB vs. SLMB
| Feature | QMB | SLMB |
|---|---|---|
| 2026 Monthly Income Limit (Single) | $1,350/mo | $1,616/mo |
| 2026 Monthly Income Limit (Couple) | $1,824/mo | $2,184/mo |
| Federal Poverty Level (FPL) | Up to 100% FPL + $20 | 100% – 120% FPL + $20 |
| Asset Limit (States with Asset Test) | $9,950 single / $14,910 couple | $9,950 single / $14,910 couple |
| Medicare Part B Premium ($202.90/mo) | ✓ Yes (Paid by State) | ✓ Yes (Paid by State) |
| Medicare Part A Premium (if applicable) | ✓ Yes | ✗ No |
| Part A & Part B Deductibles | ✓ 100% Covered ($0 owed) | ✗ You pay standard deductibles |
| Doctor & Hospital Copays / Coinsurance | ✓ 100% Covered ($0 owed) | ✗ You pay standard 20% coinsurance |
| Federal Billing Protection | ✓ Yes (42 U.S.C. § 1396a(n)) | ✗ No protection against cost-sharing |
| Extra Help for Part D Rx Drugs | ✓ Auto-enrolled | ✓ Auto-enrolled |
| Retroactive Coverage | Starts month after approval | ✓ Up to 3 months retroactive |
1. Income Differences: The 100% vs. 120% FPL Rule
The primary gateway between QMB and SLMB is your countable monthly income:
- QMB is for incomes up to 100% FPL: For 2026, an individual with unearned income (such as Social Security or a pension) can earn up to $1,350/month ($1,824/month for a married couple) after factoring in the standard $20 general income disregard.
- SLMB is for incomes between 100% and 120% FPL: If your monthly income exceeds $1,350 but is below $1,616/month ($2,184/month for a married couple), you qualify for SLMB.
2. Cost-Sharing and Provider Billing: The Biggest Practical Distinction
While both programs relieve you of the $202.90/month Medicare Part B premium, QMB goes much further:
Under federal law (42 U.S.C. § 1396a(n)), doctors, hospitals, and medical equipment suppliers are strictly prohibited from billing a QMB patient for Medicare-covered deductibles, coinsurance, or copayments. Even if a provider does not participate in Medicaid, they cannot charge a QMB enrollee.
With SLMB: You do not receive cost-sharing protection. You must still satisfy the annual Part B deductible ($283 in 2026) and pay your standard 20% Medicare coinsurance when seeing specialists, unless you have supplemental insurance (such as a Medigap plan or Medicare Advantage).
3. Retroactive Benefits: An Advantage of SLMB
One area where SLMB is more flexible than QMB is retroactive reimbursement:
- SLMB allows up to 3 months of retroactive coverage: If you were eligible in the three months preceding your application, your state Medicaid agency will reimburse the Medicare Part B premiums deducted from your Social Security checks during that window.
- QMB never applies retroactively: By federal statute, QMB coverage strictly begins on the first day of the month following the month in which your application is officially approved.
Can You Choose Between QMB and SLMB?
No. You do not apply specifically for "QMB" or "SLMB." You apply for the Medicare Savings Program with your state Medicaid department. The state will calculate your countable income and automatically place you in the highest tier you qualify for.
Frequently Asked Questions
What is the main difference between QMB and SLMB?
QMB covers Medicare Part B premiums, Part A premiums, and all deductibles, coinsurance, and copays (saving up to $6,975/year). SLMB only pays the Part B premium ($2,435/year), but has higher income thresholds ($1,616/mo single vs $1,350/mo for QMB).
Does SLMB pay doctor copays and deductibles like QMB?
No. SLMB only pays your monthly Medicare Part B premium. It does not pay your Part A or Part B deductibles, coinsurance, or copayments. Only QMB provides complete cost-sharing coverage.
Do both QMB and SLMB include Extra Help for prescription drugs?
Yes. Anyone approved for either QMB or SLMB automatically qualifies for full Extra Help (Low-Income Subsidy) for Medicare Part D prescription drugs, which caps prescription copays.
Is SLMB coverage retroactive?
Yes. SLMB benefits can be retroactive up to 3 months prior to the application month if you were eligible during that period. QMB coverage is not retroactive and begins the month after approval.
Find Out Which Tier You Qualify For in 90 Seconds
Our free eligibility checker calculates your state disregard rules and tells you whether you qualify for QMB, SLMB, or QI.