What Is a Medicare Set-Aside (MSA)?

A Medicare Set-Aside (MSA) is a financial arrangement that reserves a portion of a liability or workers' compensation settlement to pay for future medical services related to the injury. The Centers for Medicare and Medicaid Services (CMS) requires this allocation so that Medicare does not pay for treatment that another party has already funded.

How the MSA Process Works

The Triggering Event

An MSA becomes relevant when a Medicare beneficiary, or someone with a reasonable expectation of becoming one within 30 months, settles a claim that includes future medical exposure. The threshold is not the size of the settlement alone. It is the intersection of Medicare status and future medical need.

The defense, the carrier, or the self-insured employer typically initiates the MSA discussion. Plaintiffs' counsel responds. The allocation is either submitted to CMS for review or handled as a non-CMS-approved arrangement. CMS review is voluntary for liability settlements but mandatory for workers' compensation cases that meet certain criteria: the claimant is a Medicare beneficiary, the settlement exceeds $25,000, or the claimant has a reasonable expectation of Medicare enrollment within 30 months and the settlement exceeds $250,000.

Building the Allocation

The MSA amount is not negotiated like pain and suffering. It is calculated from medical records, physician opinions, and life expectancy tables. A professional administrator or allocation vendor reviews the last two years of treatment, identifies injury-related care, and projects future costs at Medicare payment rates.

A typical allocation for a 55-year-old construction worker with a lumbar fusion might include:

• Annual physical therapy: 24 visits at Medicare rates
• MRI every two years
• Medication management: opioid taper, muscle relaxants, anti-inflammatories
• Possible revision surgery at year ten

The total is discounted to present value and placed in the MSA. The settlement check is then split: the MSA portion goes to a segregated account, and the remainder goes to the claimant as usual.

Administration and Exhaustion

Post-settlement, the MSA funds must be used exclusively for Medicare-allowable, injury-related expenses. The administrator pays providers directly, submits annual accounting reports to CMS, and maintains documentation for audit. Once the MSA is properly exhausted, Medicare resumes primary payment for those services.

Improper use is a problem. If the claimant spends MSA funds on non-qualifying expenses, Medicare may deny coverage for injury-related care until the improper expenditure is restored.

Why the MSA Matters to Your Firm

If you handle personal injury, workers' compensation, or liability settlements, the MSA is not a formality. It is a compliance point that can delay closing, invite CMS rejection, or expose your client to future coverage gaps.

For plaintiff firms, an understated MSA leaves the client vulnerable. Medicare denies payment later, and the client returns asking why the settlement did not protect them. For defense firms and carriers, an overstated MSA inflates settlement cost and extends negotiation. Both sides have incentive to get the number right.

The administrative burden also matters. Your firm does not manage the MSA post-settlement, but you do explain it to the client. You do review the allocation report for reasonableness. You do decide whether to seek CMS approval or proceed without it. Each choice carries risk and documentation requirements.

MSA vendors are not neutral. They work for the party that hired them. A plaintiff-retained vendor may project conservative treatment. A defense-retained vendor may project aggressive utilization review. Understanding the methodology lets you challenge the opposing allocation with specificity.

Where Practitioners Misstep

Confusing the MSA with the Total Settlement

Some attorneys treat the MSA as a separate negotiation. It is not. The MSA is a subset of the total settlement. If the MSA calculation comes back at $180,000 and the carrier offered $400,000, the claimant still receives $220,000 in non-MSA funds. The settlement does not increase because the MSA exists. The MSA is carved from it.

This confusion leads to client disappointment. The client sees a $400,000 settlement, then learns $180,000 is restricted. Clear explanation early prevents this.

Ignoring Conditional Payment Recovery

Before the MSA is even addressed, Medicare may have paid for injury-related treatment under its conditional payment rules, 42 U.S.C. section 1395y(b)(2). These payments must be repaid from the settlement. Some practitioners negotiate the MSA while the conditional payment demand sits unresolved. The settlement closes, the client receives funds, and the Medicare Secondary Payer Recovery Contractor (MSPRC) issues a demand. The client has spent the money.

Resolution: resolve conditional payments before finalizing the MSA, or escrow the disputed amount.

Failing to Document the Rationale

CMS approval is not required for all MSAs. Many liability settlements proceed without submission. But the decision not to submit needs a file. If Medicare later challenges the arrangement, the firm must show that the MSA was reasonably calculated and that the client was advised of the risks. A memo to the file, signed by the client, is minimum documentation.

Related Terms in Legal and Claims Recovery

Practitioners working with MSAs should also understand Subrogation, the insurer's right to recover from a third party, which runs parallel to Medicare's conditional payment recovery. Structured Settlement arrangements often pair with MSAs to stretch the non-MSA portion over time. Waiver of Subrogation clauses in construction or commercial contracts can affect whether a carrier even has standing to pursue the claim that later generates an MSA. Proof of Loss timelines inform how quickly the medical record foundation must be built for the allocation. Public Adjuster work in property claims occasionally intersects with Medicare exposure when elderly homeowners suffer injury on damaged premises.