If you have been hurt at work in California and you are approaching a settlement, two words can stop the process cold: Medicare Set-Aside. Insurance adjusters bring it up. Your employer's attorney brings it up. Sometimes nobody brings it up at all, and that silence can cost you your future medical coverage.
This article explains what a Workers' Compensation Medicare Set-Aside Arrangement (WCMSA) is, when it applies in a California workers' comp case, how the money must be handled, and what happens if you get it wrong.
Quick answer: An MSA is a protected account within your settlement that pays for future injury-related medical care so Medicare does not end up footing a bill it was never supposed to cover. Whether you need one, how large it should be, and how it affects your overall settlement number are the three questions this article answers.
What You Need to Know at a Glance
- A WCMSA is required when your settlement closes out future medical care and Medicare's interests are involved.
- Two CMS thresholds trigger the need for a formal analysis: a settlement over $25,000 for current Medicare beneficiaries, or over $250,000 when Medicare enrollment is reasonably expected within 30 months.
- California Compromise and Release settlements are the most common situation where MSA questions arise, because they extinguish the right to future employer-funded treatment.
- Spending MSA funds on the wrong things can cause Medicare to refuse future injury-related claims until the money is replenished.
- MSA projections from insurance carriers are not always accurate. They can be challenged.
- If you have questions about whether an MSA affects your settlement, call (818) 794-9947 for a free consultation. No fee unless we win.
Why Future Medical Care Is Part of a Workers' Comp Settlement
Under California Labor Code §4600, your employer (through its workers' comp insurer) is required to provide all medical treatment that is reasonably required to cure or relieve the effects of your work injury. That obligation does not automatically end when you settle your wage-loss and disability claims. It continues as long as you need injury-related care, unless you voluntarily give it up.
The two ways a California workers' comp case typically closes are:
- Stipulation with Request for Award (Stip): You and the insurer agree on your level of permanent disability, but the employer keeps paying for ongoing authorized medical treatment. Future medical care stays open.
- Compromise and Release (C&R): You accept a lump-sum payment and release all claims, including future medical treatment. The employer pays nothing for your injury-related care after the settlement check clears.
When you close your case with a C&R, you are giving up the right to have the insurer pay your doctors for the rest of your life. That is a significant trade. If you are on Medicare, or will be soon, the government has a direct interest in what happens next, because Medicare may end up covering the bills the workers' comp carrier no longer has to pay.
That is where the MSA comes in.
What a Medicare Set-Aside Is and Why Medicare Requires It
A Workers' Compensation Medicare Set-Aside Arrangement is a portion of your settlement that must be reserved exclusively to pay for future injury-related medical care that Medicare would otherwise cover.
Medicare is a secondary payer under the Medicare Secondary Payer (MSP) Act, 42 U.S.C. §1395y(b). That means Medicare is not supposed to pay for medical costs that another party, like a workers' comp insurer, is responsible for paying. When you settle a workers' comp case and close out future medical benefits, you effectively remove the primary payer from the picture. If Medicare later pays for your injury-related care without an MSA in place, it is arguably paying a bill that your settlement proceeds were supposed to cover. Federal law requires you to protect Medicare from that outcome.
The Centers for Medicare and Medicaid Services (CMS) administers the MSA program. CMS does not have a formal regulation that mandates an MSA in every workers' comp settlement. What CMS does require is that you consider Medicare's interests whenever Medicare is, or soon will be, in the picture.
In plain English: If you are settling a case that closes out future medical care, and Medicare has a reasonable chance of being your health insurer after the settlement, federal law says you cannot simply pocket all the money and then let Medicare pay for your injury treatment. A portion of the settlement has to be set aside first.
When an MSA Comes Into Play in a California Settlement
CMS voluntary review thresholds require a settlement over $25,000 if you are already on Medicare, or over $250,000 if you have a reasonable expectation of enrolling within 30 months.
Two thresholds determine whether CMS will voluntarily review an MSA allocation:
| Your Medicare Status | Settlement Threshold |
|, |, |
| Currently enrolled in Medicare | Total settlement over $25,000 |
| Reasonable expectation of enrollment within 30 months | Total settlement over $250,000 |
A "reasonable expectation" of Medicare enrollment within 30 months means you are 62.5 years old or older (approaching Medicare eligibility at 65), you have applied for Social Security Disability Insurance (SSDI), or you have been denied SSDI but are appealing.
You do not have to submit your MSA to CMS for formal review unless you choose to. Submission is voluntary. However, getting CMS approval gives you a safe harbor: if you follow the approved MSA and spend the funds correctly, Medicare will not later come back and say you did not protect its interests adequately.
Many California workers' comp cases settle below the CMS review thresholds. Even then, if you are a Medicare beneficiary and you are closing out future medical care, you and your attorney should document the analysis showing why Medicare's interests were considered. This is not a checkbox formality. It is a federal compliance issue.
The California-specific wrinkle: Because California is a relatively high-wage and high-cost-of-care state, C&R settlements that involve serious injuries often exceed both thresholds. Construction injuries, back and spine injuries, repetitive stress claims, and industrial disease cases frequently produce settlement values where an MSA analysis is mandatory as a practical matter.
In California, the moment your workers' comp settlement closes out future medical benefits, you and your attorney should analyze whether Medicare's interests need to be protected in the agreement.
How Set-Aside Funds Must Be Managed and Spent
Once an MSA is established, the funds must be placed in a separate, interest-bearing account. They are not yours to use for any purpose you choose. They are earmarked for one thing: paying Medicare-covered medical expenses related to your work injury.
Here is what that means in practice:
Proper uses of MSA funds:
- Doctor visits related to the work injury
- Prescription medications for the injury
- Physical therapy and rehabilitation
- Diagnostic imaging (MRI, X-ray) for the injury
- Surgery or procedures that Medicare would cover for the injury
Improper uses of MSA funds:
- Medical care that is unrelated to the work injury
- Non-Medicare-covered treatments (some alternative medicine, for example)
- Living expenses, bills, or anything personal
If you spend MSA funds on anything other than covered, injury-related medical care, Medicare can deny payment for your future treatment until you restore those funds out of your own pocket.
When the MSA account is exhausted because you spent it correctly on injury-related care, Medicare steps in as the primary payer for your ongoing injury-related treatment. That is exactly how the system is supposed to work.
Reporting requirements: If CMS approved your MSA, you are required to submit annual attestation reports showing how the funds were spent. If your balance runs out, you report that too, which triggers Medicare's primary-payer obligation. Missing these reports can create compliance problems.
Who holds the account: MSA funds can be self-administered or professionally administered. Self-administration means you manage the account, keep records, and file the annual reports yourself. Professional administration means a third-party company handles the account and reporting for a fee, which is typically taken from the MSA funds themselves. For larger MSAs, professional administration reduces the risk of compliance errors.
Balancing a Lump-Sum Settlement Against Ongoing Treatment Needs
This is where the real negotiating happens, and where having an experienced California workers' comp attorney matters most.
An MSA allocation reduces the "spendable" portion of your settlement. If your total C&R is $300,000 and the MSA projection is $80,000, you walk away with $220,000 in unrestricted funds and $80,000 locked in the MSA account. The insurer knows this. So does your attorney. The question is whether the $80,000 MSA projection is accurate.
California workers' comp settlements that include a Compromise and Release are the most common situation where an MSA analysis becomes necessary, because the worker is trading away the right to lifetime employer-funded treatment.
MSA projections are typically prepared by third-party allocators hired by the insurer. They use your medical records, your treating physician's opinion about future care needs, and Medicare reimbursement rates to calculate how much you will likely spend on injury-related care in the future. This process involves judgment calls, and those judgment calls are not always in your favor.
An insurer-generated MSA may:
- Project treatments you would never realistically need
- Use aggressive cost assumptions that inflate the number
- Fail to account for the fact that some of your current treatment will end as your condition stabilizes
- Not properly apply Medicare fee schedule rates instead of actual billed charges
Your attorney can hire an independent MSA allocator to review the insurer's projection, challenge assumptions that are not supported by your medical record, and negotiate a lower MSA figure. A lower MSA means more money in your hands at settlement.
You do not have to accept a lowball settlement just because an insurer claims a large MSA is required, because an experienced attorney can challenge inflated MSA projections the same way they challenge any other part of a settlement offer.
There is also a broader strategic question: Should you settle with a C&R at all, or is a Stipulation with Request for Award better for your situation? If your injury requires ongoing treatment that is currently well-managed under the workers' comp system, closing out future medical care in exchange for a lump sum may not serve your long-term interests, especially if your projected future medical costs are high. That analysis is fact-specific and depends on your age, your diagnosis, your Medicare status, and the quality of care you have been receiving.
Why Getting the Future-Medical Piece Right Matters So Much
Workers' comp settlements are final. Under Cal. Lab. Code §5003, once a Workers' Compensation Appeals Board (WCAB) judge approves a C&R, it is very difficult to reopen. You cannot go back to the insurer and ask for more money because your injury got worse or your MSA ran out faster than projected. The only narrow exception under Cal. Lab. Code §5803 is a petition to reopen for new and further disability within five years of the date of injury, and even that is limited.
This is why the future-medical analysis, including any MSA calculation, has to be done correctly before the settlement is signed, not after. Errors made at the negotiation table follow you for the rest of your life.
A few scenarios that illustrate the stakes:
Scenario 1, The inflated MSA: An insurer projects an $120,000 MSA for a lumbar spine injury. Your attorney hires an independent allocator who reviews your medical records and concludes that $55,000 is the appropriate figure based on your actual treatment history and stabilized condition. The difference of $65,000 stays in your pocket. Without representation, you would have signed the original number.
Scenario 2, The missing MSA: A worker settling a C&R is 63 years old and approaching Medicare eligibility. The insurer does not raise the MSA issue and the worker, unrepresented, signs a C&R with no MSA allocation. Two years later the worker is on Medicare and needs surgery related to the original injury. Medicare investigates, determines the settlement failed to protect Medicare's interests, and declines to pay, directing the worker to use settlement funds that were already spent. The worker is left with no coverage and no money.
Scenario 3, The wrong type of settlement: A worker with a serious spinal cord injury is offered a C&R with a generous lump sum. The future medical costs for that injury, including ongoing nursing care and durable medical equipment, are projected to be substantial. A Stip might keep those costs on the insurer indefinitely. Closing out future medical care in exchange for a lump sum that would run out in three years is not a good trade, regardless of what the upfront number looks like.
These are not hypotheticals invented to scare you. They are the kinds of outcomes that experienced California workers' comp attorneys see and prevent every day.
FAQ
What is a Medicare Set-Aside in workers' comp?
A Workers' Compensation Medicare Set-Aside Arrangement (WCMSA) is a portion of your workers' comp settlement that is reserved in a separate account to pay for future injury-related medical care that Medicare would otherwise cover. It exists because Medicare is a secondary payer under federal law and cannot be left to pay bills that your settlement was supposed to cover.
Do I need an MSA in my California workers' comp settlement?
Not every California workers' comp settlement requires an MSA. An MSA analysis is most important when you are settling with a Compromise and Release that closes out future medical benefits, and when you are either currently on Medicare or have a reasonable expectation of Medicare enrollment within 30 months. If neither condition applies, an MSA may not be necessary, but the analysis should still be documented.
Who controls the money in a Medicare Set-Aside?
You control the MSA account, either personally (self-administered) or through a professional MSA administrator you hire. The funds belong to you, but they can only be spent on Medicare-covered, injury-related medical expenses. You are also required to keep records and submit annual reports to CMS if your MSA was formally approved by CMS.
What happens if I spend MSA funds on something else?
If you spend MSA funds on anything other than covered, injury-related medical care, Medicare can refuse to pay for your future injury-related treatment until you replenish the amount you spent improperly, out of your own personal funds. This can be financially devastating, especially for older workers with serious injuries.
Can I challenge the MSA amount the insurer proposes?
Yes. MSA projections prepared by insurer-hired allocators are not automatically correct. Your attorney can retain an independent allocator to review the projection, challenge assumptions that are not supported by your actual medical records, and negotiate a lower figure. A lower MSA means more money available to you from the overall settlement.
What is the difference between a Compromise and Release and a Stipulation for MSA purposes?
A Compromise and Release closes out your future medical benefits in exchange for a lump-sum payment. This is the settlement type where MSA questions are most critical. A Stipulation with Request for Award keeps future medical care open and payable by the insurer, so Medicare's interests are generally not at stake in the same way, because the insurer remains the primary payer for your ongoing treatment.
Does California law specifically require an MSA?
California state law does not have a separate MSA statute. The obligation to protect Medicare's interests comes from federal law, specifically the Medicare Secondary Payer Act (42 U.S.C. §1395y(b)). California workers' comp law governs the settlement process itself, including WCAB approval under Cal. Lab. Code §5003. Both frameworks apply simultaneously.
What if my settlement is below the CMS review thresholds?
CMS voluntary review thresholds are not the same as legal requirements. Even if your settlement is below the $25,000 or $250,000 thresholds, if you are a Medicare beneficiary settling a case that closes out future medical care, federal law still requires you to consider Medicare's interests. Working with an attorney who documents that analysis protects you even when formal CMS review is not triggered.
Talk to a California Workers' Comp Attorney Before You Sign
An MSA can be the difference between a settlement that funds your future care and one that leaves you unable to access Medicare benefits when you need them most. Getting the allocation right, and knowing whether a C&R is even the right settlement structure for your situation, requires someone who knows California workers' comp law and has handled these negotiations before.
We have recovered over $150,000,000 for injured workers across Southern California. We take every case personally, and we never let an insurer's paperwork determine what your future is worth.
If you have a workers' comp settlement on the table, or if you are trying to understand your options before you get there, call (818) 794-9947 for a free consultation. No fee unless we win.
Reviewed by Minas Nordanyan, CA Bar No. 296806. Last updated July 2026. This article is for general educational purposes and does not constitute legal advice for your specific situation. California workers' comp law is complex and fact-specific. Contact a licensed California workers' compensation attorney to evaluate your case.