What Is a Medicare Set-Aside? A Plain-English Guide for Injury Settlements
A Medicare Set-Aside (MSA) is a portion of your injury settlement placed in a separate account to pay for future injury-related medical care that Medicare would otherwise cover. It's carved out of your own settlement money, and it exists because of a federal rule called the Medicare Secondary Payer Act. Despite how it sounds, an MSA is not a government account, and creating one isn't automatically forced on you.
That's the short version. If your lawyer or claims adjuster mentioned a “set-aside” and you're worried Medicare is quietly taking a slice of your settlement, take a breath. The money stays yours. A workers' compensation Medicare Set-Aside (WCMSA) is the most common form, and the Centers for Medicare & Medicaid Services (CMS) oversees the process. Below, we'll walk through why these accounts exist, whether one applies to you, how the amount gets set, and how you manage it without risking your future Medicare coverage.
The myth | The reality |
|---|---|
Medicare holds the money | You hold it, in a separate account |
An MSA is legally required | Protecting Medicare's interest is required; the account and CMS review are not automatic |
It covers all your medical bills | It covers only future, injury-related, Medicare-covered care |
To see why this account has to exist at all, start with one federal rule.
Why Medicare Set-Asides Exist: the Medicare Secondary Payer Rule
Medicare Set-Asides exist because federal law, the Medicare Secondary Payer Act, makes Medicare the last payer, not the first, for injury care that a settlement is meant to cover. When you settle a workers' comp or injury claim that includes money for future treatment, that settlement money is supposed to pay for your injury care before Medicare steps in.
The rule lives in the U.S. Code at 42 U.S.C. § 1395y(b). In plain terms, it says Medicare shouldn't foot the bill for care that someone else, like a workers' compensation insurer or a settlement, is already responsible for. So when a settlement sets money aside for future medical expenses, Medicare expects you to spend that money first. Every party in the case shares a duty to protect Medicare's interests, and a set-aside is the standard way to do it.
Here's the logic in one line: your settlement funds future care, the law says spend those funds first, and Medicare pays only after they're gone.
That rule raises the obvious next question: is an MSA something you're actually forced to do?
Whose Money Is It, Really?
The funds in a Medicare Set-Aside are your own settlement dollars held in a separate account for your future care, not money paid to or kept by Medicare. Nobody at CMS is holding your cash. You are.
Think of it as a dedicated pocket inside your own settlement. The money is segregated, meaning it's kept apart from your general funds so it's clear those dollars are earmarked for injury-related, Medicare-covered treatment. As long as you use it that way and keep good records, you preserve your right to have Medicare cover your care later. Spend it on unrelated things and you can jeopardize that coverage, which is the one real risk to watch. This is different from Medicaid planning, which involves separate tools we'll touch on shortly.
So the money is yours. The next worry most people have is whether they're required to set it up at all.
Are Medicare Set-Asides Required?
No statute forces you to create or submit a Medicare Set-Aside, but federal law does require every settlement to protect Medicare's interest in future care, which is why set-asides are the standard method. This is the single point that confuses people most, so it's worth separating cleanly.
- Mandatory: Considering and protecting Medicare's interest under the Medicare Secondary Payer rules. This duty applies in every qualifying settlement.
- Optional: Submitting your set-aside to CMS for review and approval. CMS itself calls submission a recommended, voluntary process, not a legal requirement.
In other words, you can't ignore Medicare's interest, but you're not legally obligated to file paperwork with CMS for every case. The set-aside is simply the cleanest, most widely accepted way to show you protected that interest.
Whether CMS will even review your set-aside comes down to two dollar thresholds.
The $25,000 and $250,000 Review Thresholds
CMS will review a workers' comp set-aside only if you're already a Medicare beneficiary and your total settlement tops $25,000, or you'll likely enroll in Medicare within 30 months and the settlement exceeds $250,000. These are the two workload review thresholds CMS uses to decide which cases it will look at.
You are... | CMS reviews if your settlement is... |
|---|---|
A current Medicare beneficiary | Greater than $25,000 |
Reasonably expected to enroll in Medicare within 30 months | Greater than $250,000 (counting future medical, disability, and lost wages) |
One important caveat: CMS describes these as workload thresholds, not a safe harbor. Settling below them doesn't erase your duty to consider Medicare's interest. It just means CMS won't formally review your allocation. The thresholds limit CMS review, not your underlying obligation.
There's also a recent change that surprises people, so let's cover what shifted in 2025.
What Changed in 2025: Mandatory Section 111 Reporting
Since April 4, 2025, settlements involving Medicare beneficiaries must be reported to CMS under Section 111, including zero-dollar set-asides, even when the settlement falls below the $25,000 review threshold. This is reporting, not approval, and it's easy to mix the two up.
Reporting means the responsible insurer discloses the settlement details to CMS. Review means CMS actually evaluates and approves an allocation amount. The 2025 change expands disclosure: even a zero-dollar MSA, one that allocates nothing because no future injury-related care is projected, now gets reported. CMS put this in place to see how many below-threshold settlements are quietly allocating money for future care.
None of this tells you how the dollar figure itself gets built, so that's next.
When a Set-Aside Applies to You: Workers' Comp vs. Liability
Set-asides apply most clearly to workers' compensation settlements, which have a formal CMS review process; liability, or personal injury, settlements can also require protecting Medicare's interest but have no formal CMS review program. Knowing which bucket you're in matters, because the rules are firm on one side and fuzzier on the other.
A workers' compensation Medicare Set-Aside (WCMSA) follows a well-defined CMS track, with published thresholds and a submission portal. It's one of the biggest factors that can shape a workers comp settlement, since the set-aside comes straight out of the money on the table. A liability Medicare Set-Aside (LMSA), tied to a personal injury settlement, is a real concept, but CMS has never built the same formal review program for it. The underlying Medicare Secondary Payer duty still applies to both. The process around it is just less settled for liability.
Vehicle | What it protects | Formal CMS review? | Typical context |
|---|---|---|---|
WCMSA | Future Medicare-covered injury care | Yes | Workers' compensation settlements |
LMSA | Future Medicare-covered injury care | No formal program | Personal injury / liability settlements |
Special needs trust | Means-tested benefits like Medicaid | No (different purpose) | Preserving benefit eligibility |
Once you know a set-aside applies, one more comparison tends to come up, because people confuse it with a different tool.
Medicare Set-Aside vs. Special Needs Trust
A Medicare Set-Aside protects Medicare by funding future injury care, while a special needs trust protects means-tested benefits like Medicaid, so many settlements use them for different, sometimes overlapping, reasons. They aren't competitors. They guard different programs.
An MSA is about Medicare and future medical expenses from your injury. A special needs trust is about keeping benefits that depend on your income and assets, such as Medicaid or SSI, which a large settlement could otherwise disrupt. Some people need one, some need both, and which applies depends entirely on your benefits and your settlement. That's a question for a qualified professional, not a rule of thumb.
With the “what applies to me” part sorted, the next worry is how big the set-aside will be.
How the Set-Aside Amount Is Determined
A Medicare Set-Aside amount is built by projecting the lifetime cost of your future, injury-related, Medicare-covered care, using your medical records, treatment plan, prescription drugs, and life expectancy. It's not a flat percentage of your settlement, and it's not a number Medicare hands you. A specialist builds it from your actual medical picture.
Here's how that allocation usually comes together:
- A vendor or allocation expert gathers your medical records and treatment history.
- They project what injury-related, Medicare-covered care you'll likely need going forward.
- They price that care, including future prescription drugs, at Medicare-approved rates.
- They factor in your life expectancy, sometimes using a rated age that reflects your health.
- They produce a recommended allocation, the dollar figure to set aside.
Because the goal is to fund your real future care, the amount can't be lowballed. An under-funded set-aside can run dry too soon and put your Medicare coverage at risk, while an over-funded one ties up settlement money you could have used. Getting it right is genuinely technical, which is why most people don't do it alone. If your case involves future medical care, it's worth working with an attorney who handles workers' comp settlement planning to make sure the allocation holds up and your interests are protected. Running the numbers early also helps, and a workers comp settlement calculator can give you a rough sense of how future medical care fits into the overall figure before you commit.
Once the amount is set, you'll decide how to fund it.
Lump-Sum vs. Structured Funding
You can fund a Medicare Set-Aside two ways: one lump-sum payment that fills the account at once, or a structured annuity that refills it with a set amount each year. Both are valid. They just behave differently if your care runs ahead of schedule.
Funding method | How it fills | If funds run short in a year |
|---|---|---|
Lump sum | The full allocation goes in at settlement | You draw from the whole balance as needed |
Structured annuity | A set amount is added each year | Medicare may cover injury care temporarily until the next annual deposit refills the account |
The structured option often costs less up front because it spreads funding over time, but it caps how much sits in the account in any single year. That tradeoff is worth discussing before you commit.
After it's funded, the account needs ongoing care of its own.
Managing the Account: Spending, Reporting, and Running Out
Once your Medicare Set-Aside is funded, you may spend it only on Medicare-covered, injury-related care, keep records and receipts, report your spending each year, and once the account is properly exhausted, Medicare resumes paying. Those are the rules in a nutshell, and following them is what protects your coverage.
Here's the spending checklist:
- Use funds only for treatment that is both injury-related and Medicare-covered.
- Keep every receipt and record for each expense.
- Complete an annual attestation, a yearly report of what you spent, when required.
- Don't dip into the account for unrelated medical bills or personal costs.
When you follow those rules and the account is properly spent down, or exhausted, Medicare steps back in as the primary payer for your injury-related care. That's the whole point of the arrangement: spend the set-aside first, then Medicare covers you. Mismanaging the account is the main thing that can break that promise.
Not everyone wants to handle that paperwork themselves, which raises one last practical choice.
Self-Administration vs. Professional Administration
You can administer a Medicare Set-Aside yourself or hire a professional administrator; both must follow the same spending and reporting rules, but a professional handles the paperwork and compliance for you. The rules don't change based on who's managing the account. Only the workload does.
Self-administration saves money and works well for organized people with straightforward care. Professional administration costs more but offloads the record-keeping, the annual attestation, and the compliance details to someone who does it daily. If your treatment is complex or you'd rather not track every receipt, professional help can be worth it. The right choice depends on your comfort with paperwork and the complexity of your care.
There's one more distinction that trips almost everyone up, and it's worth clearing up before you go.
Set-Aside vs. Medicare Lien: A Distinction That Trips People Up
A Medicare Set-Aside pays for your future injury care, while a Medicare conditional payment, or lien, repays Medicare for injury care it already covered before your settlement, so they are two separate obligations, not the same thing. People assume the set-aside handles everything Medicare-related. It doesn't.
A conditional payment happens when Medicare pays your injury bills while your claim is still being resolved, on the condition it gets paid back once you settle. That repayment is the Medicare lien, and it's about the past. The set-aside is about the future. You can owe both in the same case: one repaying Medicare for care it already gave, the other funding care still to come.
Obligation | Covers | Timing |
|---|---|---|
Medicare Set-Aside | Future injury-related care | After settlement |
Conditional payment / lien | Injury care Medicare already paid | Before settlement |
With the mechanics clear, here are the questions people ask most.
Frequently Asked Questions
Is a Medicare Set-Aside mandatory?
No law forces you to create or submit one. What's mandatory is protecting Medicare's interest in your future injury care under the Medicare Secondary Payer rules. A set-aside is simply the standard, widely accepted way to meet that duty, and submitting it to CMS for review is a voluntary, recommended process rather than a legal requirement.
Is the set-aside money mine or the government's?
It's yours. A Medicare Set-Aside holds your own settlement dollars in a separate account earmarked for future injury-related care. Medicare never takes or holds the funds. You control the account, spend it on qualifying care, and keep records, which is exactly what preserves your future Medicare coverage.
What happens when the funds run out?
Once you've properly spent the account down on Medicare-covered, injury-related care and reported it correctly, Medicare resumes paying as your primary coverage for that injury. Proper exhaustion is the trigger. If the account was mismanaged or spent on the wrong things, that resumption of coverage can be delayed or denied.
What can I spend Medicare Set-Aside funds on?
You can spend the funds only on future medical care that is both related to your injury and covered by Medicare, including qualifying prescription drugs. You cannot use them for unrelated health costs or personal expenses. Keep receipts for everything, because documentation is what proves the account was used correctly.
Do I need a set-aside for a personal injury settlement?
Possibly. Liability and personal injury settlements still carry a duty to protect Medicare's interest, but CMS has no formal review program for liability set-asides the way it does for workers' comp. Whether you need one depends on your situation, so this is a question for a qualified attorney rather than a fixed rule.
What is a zero-dollar Medicare Set-Aside?
A zero-dollar MSA allocates nothing to future care because no future injury-related, Medicare-covered treatment is projected, often when a doctor certifies none is needed. Since April 4, 2025, these still must be reported to CMS under Section 111, even below the usual review thresholds, so “zero-dollar” no longer means “invisible.”
How is the set-aside amount calculated?
A specialist projects the lifetime cost of your future, injury-related, Medicare-covered care using your medical records, treatment plan, prescription drugs, and life expectancy, then recommends an allocation. It isn't a flat percentage of your settlement. The goal is an amount large enough to cover real future care without over-funding the account.
What if I don't set one up?
Skipping proper protection of Medicare's interest can put your future Medicare coverage for the injury at risk and create compliance problems. The Medicare Secondary Payer duty applies whether or not you formalize a set-aside. That's why most settlements involving future medical care use one, even when CMS review isn't required.
Can I administer the account myself?
Yes. Self-administration is allowed, and many people manage their own set-aside. You'll follow the same spending and reporting rules a professional would, including keeping receipts and completing any required annual attestation. If your care is complex or the paperwork feels heavy, a professional administrator can handle it for you.
Will a set-aside affect my regular Medicare benefits?
Handled correctly, it protects them. The set-aside only governs injury-related care tied to your settlement. Your other Medicare benefits continue as usual. The account exists specifically so Medicare will keep covering your injury care after the set-aside funds are properly spent down.
How long does CMS review take?
Review timelines vary by case and by how the submission is filed, and CMS updates its process periodically. The electronic WCMSA portal is generally faster than mailing paper. Because timeframes change, check the current CMS guidance or ask the professional handling your submission rather than relying on a fixed estimate.
This guide is general information about Medicare Set-Asides, not legal or financial advice. Whether you need a set-aside, and how it should be structured, depends on your specific settlement and benefits. Consult a qualified attorney or a Medicare compliance professional about your situation. Thresholds and CMS procedures are current as of 2026 and are subject to change; verify details against CMS.gov.