Nobody checks whether you qualify. You have to ask.

There are four programs whose entire purpose is to pay Medicare costs for people whose income is below a line. Between them they can cover the Part B premium, the Part A premium, deductibles, coinsurance and copays, and they open a separate door to help with drug costs.

They share one feature that decides everything else. For almost everyone, none of them begins automatically. No agency compares a household's income against the thresholds and writes to them. Eligibility is established by applying, and an application not made is indistinguishable, from the outside, from not qualifying.

There is one clear exception, and it runs the other way. Federal law requires that people receiving supplemental security income, and people who already have full Medicaid alongside Medicare, are treated as eligible for the drug subsidy in Part 5 without applying for it separately. Some states also enroll people they already have on file. Neither of those covers the four programs below for the ordinary case, which still needs an application.

The structure is federal and the administration is not. Federal law defines the four categories and sets the tests as percentages of the official poverty line. Each state then runs the program, sets the operative figures inside those limits, decides how to take applications, and in some cases counts income more generously than federal law requires or drops the resource test entirely. That is why this guide gives percentages rather than dollar amounts: the dollar figure that matters is the one your state is using this year, and it is the only one worth writing down.

This guide is educational information. It is not legal, tax or financial advice.

Federal law creates four categories. They are usually described together, which hides how differently they behave.

Three things in that table are worth pulling out.

The first program is far more valuable than the others. It pays the premiums and it also covers the deductibles, the coinsurance and the copays, which is the whole of what Medicare leaves a patient to pay. The next two pay one premium and nothing else.

The third has a condition the others do not: it is only available to someone not otherwise eligible for Medicaid, and it is funded from a limited allocation rather than as an open entitlement. In practice that means applying early in a year matters in a way it does not for the others.

The fourth exists for a narrow group and is almost never mentioned: someone under 65 who lost premium-free hospital coverage because they returned to work while still disabled. It carries its own income and resource conditions, and it does not reach someone who went back to work but kept their disability payments.

Someone in the first category is protected by a rule that operates on the provider rather than on the patient.

Where a state's payment toward the person's Medicare cost sharing is reduced or eliminated, which happens routinely because states are not required to pay more than their own rate, federal law provides that:

• Medicare's payment plus whatever the state paid is treated as payment in full for the service.
• The person has no legal liability to pay the provider anything further.
• The sanctions that apply to a provider for excess charges apply to charging that person.

So a bill arriving for a deductible or a coinsurance amount is not a bill that has to be paid. It is a bill that should not have been sent.

One thing this does not do is oblige a provider to treat you. It governs what you can be charged, not who has to take you as a patient.

The practical failure is a different one. The provider most likely to send a bill anyway is one who does not deal with the state program at all and has no reason to think the rule reaches them. That is precisely the situation in which the letter and the sentence in the callout above do the work, because the alternative is paying something that was not owed.

Eligibility turns on two separate questions.

Income

Federal law sets the first program's income line at not more than 100 percent of the official poverty line for the family size, with the other categories stacked above it at the percentages in Part 2. The poverty line is revised annually, and it is higher in Alaska and Hawaii.

What counts as income is drawn from the rules used for supplemental security income, which is a narrower definition than a tax return uses. Some money that appears on a tax return is not counted here, and states may disregard more than federal law requires.

Resources

The resource test for the first program is tied to the level used for drug cost help, which federal law sets at three times the standard used for supplemental security income. Certain things sit outside it entirely, and the exclusions are why the two common assumptions in Part 1 are usually wrong.

The two tests are not equally open to state generosity, and the difference matters. On income, federal law sets a ceiling as well as a floor: the level for the first program must be at least a specified percentage of the poverty line and not more than 100 percent of it. A state cannot simply raise that percentage. What it can do is change how income is counted, and several states disregard more than federal law requires, which reaches the same place by a different route.

On resources the position is genuinely open. Some states have removed the resource test for these programs altogether. A state can be more generous there and cannot be less.

A separate federal subsidy reduces what someone pays for prescription drug coverage. It is a different program with a different application, and the two are linked in a way that makes the order of operations matter.

The subsidy is available to a person who is enrolled in a Part D or Medicare Advantage drug plan, has income below 150 percent of the poverty line, and meets a resource test. That income line sits well above the thresholds for the four programs in Part 2, so a household can be over the line for premium help and still qualify for drug help.

It runs the other way too, and this is the part worth acting on. Federal law lets someone found eligible for the first, second or third of the four programs be treated as eligible for the drug subsidy rather than having to establish it from scratch, so one application can reach both.

The fourth program is not on that list. Someone qualifying only under it has to apply for the drug subsidy separately, which is easy to miss precisely because everything else about these programs is described as though the four were interchangeable.

A great deal of medical assistance can be granted retrospectively, for care provided in months before the application, which is why people are often told there is no harm in applying late. How far back that reaches is set by federal law, has been legislated to narrow for applications filed in future years, and is worth checking rather than assuming.

That does not hold here. For Medicare cost sharing under the first of the four programs, federal law provides that assistance covers care provided after the month in which the individual becomes such a beneficiary. There is no three month reach back for it.

The consequence is worth stating plainly, because it inverts the usual advice. Every month between qualifying and applying is a month of premiums, deductibles and coinsurance that nobody will reimburse. A person who was eligible for two years before applying does not receive two years of anything. They begin from the point the paperwork catches up.

That carve-out is written for the first program specifically. This guide does not assert the same limit for the others, which is a question worth putting to the state rather than assuming in either direction.

Two provisions sit in the statute specifically to stop people losing help at the moment it is least affordable to lose.

The raise that does not count

Social Security payments rise most Januaries, and the poverty line is revised on its own schedule. Left alone, that would knock people over the income line every year for a few months until the new figures caught up. Federal law handles it by disregarding, for a defined transition period, the amount attributable to the increase in the monthly benefit.

Practically, an annual cost of living increase should not by itself end eligibility during that window, and someone told it has is worth asking again with the timing named. What it is not is a permanent exemption. Once the new figures are in force the increase counts like any other income, so it is a bridge across a few months rather than protection from the arithmetic.

The year after a death

Where someone's spouse dies during the effective period of a determination for the drug subsidy, federal law as it currently stands extends that period by a year beyond when it would otherwise have ended.

The reason is plain once stated. A household's income and circumstances change completely at a death, the survivor is dealing with everything else at once, and the last thing that should happen in that year is a redetermination that removes help with drug costs. It is an unusually humane provision and it is almost never mentioned.

Nothing here costs anything, and the only way to establish that you do not qualify is to be told so by the people who decide.

• Find your own state's current income and resource figures for these programs. Your state, this year. No other figure is the one that will be applied.
• Apply now rather than when you are certain. Cost sharing help does not reach backwards, so every month of delay is money nobody refunds.
• Apply even where the figures look marginal. Some states disregard more income than federal law requires, and some have removed the resource test entirely.
• Apply even if you own your home. The resource test does not work the way people assume.
• Note the third program is funded from a limited allocation. Where your income falls in that band, applying early in the year matters.
• Ask specifically whether the application also covers help with drug costs, so that one application reaches both. If you qualify only under the fourth program, apply for the drug subsidy separately, because that one does not carry across.
• If there is no drug plan at all, sort that out at the same time. The subsidy needs a plan to apply to.
• Once enrolled in the first program, keep the confirmation letter and take a copy to appointments.
• Where a bill arrives for a deductible or coinsurance after that, say you are enrolled and that federal law treats what has been paid as payment in full.
• If eligibility ends shortly after a January increase, ask about the transition rule that disregards it.
• If eligibility ends in the year after a spouse's death, ask about the extension that applies in exactly that case.

The first program: entitlement to Part A, a state-set income level, and the resource test
42 U.S.C. 1396d(p)(1). Retrieved September 5, 2026.

That income level is not more than 100 percent of the official poverty line for the family size
42 U.S.C. 1396d(p)(2)(A). Retrieved September 5, 2026.

The transition rule that disregards an increase in a monthly benefit
42 U.S.C. 1396d(p)(2)(D). Retrieved September 5, 2026.

Medical assistance may reach back three months, except that cost sharing for the first program covers care after the month the person becomes eligible
42 U.S.C. 1396d(a). Retrieved September 5, 2026.

The four categories and the income bands: full cost sharing, the Part A premium, the Part B premium below 120 percent, and the Part B premium between 120 and 135 percent for people not otherwise eligible
42 U.S.C. 1396a(a)(10)(E). Retrieved September 5, 2026.

Payment in full, no legal liability to the provider, and the excess charge sanctions
42 U.S.C. 1396a(n)(3). Retrieved September 5, 2026.

Supplemental security income recipients and full-benefit dual eligibles are treated as subsidy eligible automatically, and the first three programs may be deemed across while the fourth is not
42 U.S.C. 1395w-114(a)(3)(B)(v). Retrieved September 5, 2026.

The drug subsidy: enrolled in a plan, income below 150 percent of the poverty line, and a resource test
42 U.S.C. 1395w-114(a)(3)(A). Retrieved September 5, 2026.

The full subsidy resource standard is three times the supplemental security income standard
42 U.S.C. 1395w-114(a)(3)(D). Retrieved September 5, 2026.

The one year extension where a spouse dies during the effective period
42 U.S.C. 1395w-114(a)(3)(B)(vi). Retrieved September 5, 2026.