A Medicare Set-Aside (MSA) is a portion of a legal settlement that’s set aside in a separate account to pay for future medical costs related to your injury, so those costs don’t get shifted to Medicare. It most commonly comes up in workers’ compensation cases, where it’s formally called a Workers’ Compensation Medicare Set-Aside Arrangement (WCMSA). The basic idea: if you’re settling a case that involves ongoing medical care, and you’re either on Medicare now or expect to be soon, the government wants to make sure your settlement dollars cover that care first, before Medicare picks up the tab.
Why Medicare Set-Asides Exist
Medicare is what’s known as a “secondary payer.” Under federal law (specifically Section 1862(b) of the Social Security Act), Medicare doesn’t pay for medical treatment when another party, like a workers’ compensation insurer, is responsible. This principle extends to settlements. If you receive a lump sum to resolve your workers’ compensation claim, that money is supposed to cover the injury-related medical care you’ll need going forward. Medicare shouldn’t have to step in and pay for something your settlement was designed to cover.
The MSA is the mechanism that enforces this. By setting aside a calculated amount of the settlement in a dedicated account, the arrangement ensures Medicare’s interests are protected. CMS (the Centers for Medicare & Medicaid Services) advises that parties to a workers’ compensation settlement should consider Medicare’s interest in future medical services and whether the settlement should include an MSA.
Who Needs a Medicare Set-Aside
MSAs are most relevant if you fall into one of two categories: you’re already a Medicare beneficiary at the time of your settlement, or you have a “reasonable expectation” of becoming one within 30 months. That second group includes people who are approaching age 65, who have applied for Social Security Disability, or who have a condition like end-stage renal disease that qualifies them for Medicare regardless of age.
CMS has established review thresholds for workers’ compensation MSAs. If you’re already on Medicare and your settlement is over $25,000, or if you reasonably expect to enroll in Medicare within 30 months and your settlement exceeds $250,000, CMS will review the proposed MSA amount to confirm it’s reasonable. Settlements below those thresholds don’t require CMS review, but that doesn’t necessarily mean an MSA isn’t appropriate. The obligation to protect Medicare’s interests exists regardless of the dollar amount.
How the Amount Is Calculated
The MSA amount is determined on a case-by-case basis. It represents an estimate of what your future injury-related medical care will cost, limited to services Medicare would otherwise cover. A typical calculation considers your current treatment plan, prescription medications, any expected surgeries or procedures, and your life expectancy. If you’re receiving physical therapy twice a week and taking two prescription medications for a back injury, for example, those costs get projected out over your expected remaining lifespan.
Most people hire a specialized vendor or consultant to prepare the MSA allocation report. This report details every anticipated medical expense, prices each one using Medicare fee schedules, and produces a total figure. Once prepared, the allocation can be submitted to CMS for review and approval, a process that typically takes several months. CMS will either approve the proposed amount, suggest a different figure, or request additional medical documentation.
How the Account Works in Practice
Once your settlement is finalized and the MSA is funded, the money goes into a separate, interest-bearing account. You can receive the funds in a lump sum or through a structured settlement that makes annual deposits. Either way, you use this account to pay for Medicare-covered medical treatment related to your injury. That includes doctor visits, surgeries, imaging, prescription drugs, physical therapy, and durable medical equipment, as long as they’re connected to the original injury and are the type of service Medicare covers.
You cannot use MSA funds for treatments Medicare wouldn’t cover, like experimental procedures or services unrelated to your injury. If you spend the money on non-covered items, you risk having Medicare refuse to pay for your injury-related care until you’ve spent an equivalent amount out of pocket.
Any interest earned on the account stays in the account and can be used for the same covered expenses. The money in your MSA is specifically yours for medical care. It doesn’t count as income for tax purposes in most situations, though taxes on interest earned do get paid from the account.
Annual Reporting Requirements
Managing an MSA isn’t just about spending the money correctly. You also have to prove it each year. Within 30 days of the anniversary of your workers’ compensation settlement, you must submit an attestation to Medicare’s Benefits Coordination and Recovery Center (BCRC) confirming the funds were used properly.
The attestation requires you to report several things: the amount spent on medical expenses and prescription drugs during the reporting period, any taxes paid on interest earned, the interest earned on the account, and the remaining account balance. You can submit supporting documentation alongside the attestation. This annual reporting continues for as long as there’s money in the account.
Some people manage their MSA accounts themselves. Others hire a professional administrator to handle the payments, record-keeping, and annual attestations. Professional administration adds a cost, but it reduces the risk of making a mistake that could jeopardize your Medicare coverage.
What Happens When the Money Runs Out
If you use your MSA funds correctly and the account is eventually exhausted, Medicare begins covering your injury-related medical care as it normally would. This is the intended outcome. The MSA was never meant to replace Medicare permanently, just to ensure your settlement dollars were spent on medical care before Medicare had to contribute.
The risk comes if the account runs out because funds were misspent. If you used MSA money on non-covered expenses, vacations, or unrelated medical bills, Medicare can refuse to pay for your injury-related care. In practical terms, this means you’d be responsible for those medical costs out of pocket until you’ve effectively “repaid” the amount that was improperly spent. This is why careful record-keeping matters so much.
Workers’ Compensation vs. Liability Cases
The formal CMS review process applies specifically to workers’ compensation settlements. For liability cases, like car accident lawsuits or slip-and-fall claims, the landscape is less defined. CMS has not established a formal review or approval process for Liability Medicare Set-Asides (LMSAs), and there are no published thresholds for when one is required.
That said, the underlying legal obligation to protect Medicare’s interests still applies to liability settlements. Many attorneys and insurers voluntarily set up LMSAs in larger liability cases to reduce the risk of Medicare pursuing reimbursement later. The lack of formal CMS guidance in this area creates uncertainty, and legal opinions vary on how aggressively Medicare enforces its interests in liability settlements. If your case involves a liability claim rather than workers’ compensation, this is an area where legal advice specific to your situation becomes particularly important.
Common Points of Confusion
People sometimes confuse a Medicare Set-Aside with a Medicare Medical Savings Account (also abbreviated MSA). They’re completely different things. A Medical Savings Account is a type of Medicare Advantage plan with a high deductible and a savings account for routine costs. A Medicare Set-Aside is a settlement allocation tool used in legal cases. The shared abbreviation causes no end of confusion, but they have nothing to do with each other.
Another common misunderstanding is that CMS “requires” an MSA in every settlement. There’s no statute that explicitly mandates a Medicare Set-Aside. What the law requires is that Medicare’s interests be protected. The MSA is the most widely accepted way to do that, and CMS has built an entire review infrastructure around it for workers’ compensation cases, but the legal requirement is the broader principle of protecting Medicare, not the MSA itself. In practice, though, setting up an MSA is how most people satisfy that obligation.