What Is a Medicare Set-Aside in a Personal Injury Case?

James Wong — Founder & Pharmacist, LienScripts | February 4, 2026 | 9 min read

A Medicare Set-Aside is a future-care allocation required in some PI settlements involving Medicare beneficiaries or soon-to-be-eligible patients. Understanding the difference between MSA and MSP conditional payment obligations is essential — and so is understanding how pharmacy liens interact with each.

MSA vs. MSP: The Confusion That Costs Attorneys

Two Medicare acronyms appear constantly in PI settlements involving Medicare-covered clients — and they are frequently confused:

Medicare Secondary Payer (MSP) — a legal framework (42 U.S.C. § 1395y(b)) that requires Medicare to be the secondary payer when another primary payer exists. In PI cases, this creates conditional payment obligations: Medicare pays for injury-related care, but it is entitled to repayment from any settlement proceeds.

Medicare Set-Aside (MSA) — a settlement planning tool that allocates a portion of the settlement to cover future Medicare-covered expenses so that Medicare is not billed for services it shouldn't pay for after the settlement funds future care.

These are two entirely separate obligations:

[!KEY] Most PI cases involve only MSP conditional payment obligations — Medicare wants repayment for what it already paid. MSAs are a distinct, future-oriented tool primarily required in workers' compensation settlements. Confusing the two leads to over-settlement in PI cases and over-allocation of funds that should go to the plaintiff.

What Is a Medicare Set-Aside?

A Medicare Set-Aside is a structured allocation of settlement funds into a dedicated account to pay for future medical expenses that would otherwise be covered by Medicare. The theory: if the settlement compensates the plaintiff for future medical care, those settlement dollars should be spent on that care before Medicare is billed.

Where MSAs are clearly required: CMS has a formal WCMSA (Workers' Compensation Medicare Set-Aside) review program for workers' compensation settlements meeting specific thresholds. The CMS WCMSA reference guide governs this process.

Where MSAs are less clear: In liability PI settlements (auto accidents, premises liability, products liability), CMS has never finalized regulations requiring MSA allocations. The Centers for Medicare & Medicaid Services (CMS) LMSA/NGHP set-aside guidance has been under development for years without a formal rule.

Practical effect in PI cases: Despite the absence of a final rule, many PI defense insurers and some plaintiff attorneys include MSA allocations in liability settlements as a precautionary measure — particularly in high-value cases involving catastrophic injuries where the plaintiff's future Medicare use is predictable and substantial.

When Is an MSA Actually Required?

For workers' compensation settlements, CMS review is available (and strongly recommended) when:

• The claimant is a current Medicare beneficiary and the settlement exceeds $25,000, OR
• The claimant has a reasonable expectation of Medicare enrollment within 30 months and the settlement exceeds $250,000

For liability (non-workers' comp) PI settlements, there is no CMS review program and no regulatory mandate. However, PI attorneys and defense insurers may voluntarily include an MSA when:

• The plaintiff is a current Medicare beneficiary
• The injuries are severe and the future care costs are substantial
• The parties want to protect against future MSP claims from CMS

[!NOTE] For routine PI cases — auto accidents without catastrophic injury, premises liability with full recovery — an MSA is generally NOT required. Overcautious MSA allocations in these cases reduce plaintiff net recovery without clear legal justification.

[!KEY] Unnecessary MSA allocations in routine liability PI cases directly reduce the plaintiff's net settlement and the attorney's fee. PI attorneys should push back on defense insurer requests for MSA allocations in cases without catastrophic injury and without a final CMS liability set-aside rule — and document that pushback in writing.

How an MSA Affects the Settlement Waterfall

When an MSA allocation is included in a PI settlement, it enters the settlement waterfall as follows:

1. Attorney fees and litigation costs (first priority by contract)
2. MSP conditional payment repayment to Medicare/BCRC (mandatory, statutory priority)
3. MSA allocation (deposited into a separate account; not distributed to plaintiff directly)
4. Medical liens — hospital liens, pharmacy liens, chiropractic liens
5. Plaintiff net proceeds

The MSA allocation reduces the pool available for lien payoffs and plaintiff net recovery. This is why it is critical to correctly distinguish whether an MSA is actually required — unnecessary MSA allocations cost the plaintiff real money.

How a Pharmacy Lien Interacts with an MSA

A pharmacy lien covers past medications dispensed through the PI treatment period — it is a claim on settlement proceeds for services already rendered. This is fundamentally different from an MSA, which covers future medications.

The pharmacy lien and the MSA do not compete:

• The pharmacy lien is a past-expense obligation satisfied from settlement proceeds at closing
• The MSA funds are set aside for future prescriptions that Medicare would otherwise cover

However, the MSA may need to include future pharmacy costs:

The WCMSA submission must include future drug costs as part of the lifetime allocation. A clinical pharmacist or MSA analyst reviews the plaintiff's injury-related medications and projects future drug spending. The MERIT from LienScripts can serve as a baseline for this analysis — it documents the medication profile, dosing, and treatment duration that will inform the future-drug projection.

[!TIP] If your client has a workers' comp claim with an MSA in addition to a third-party PI claim with a pharmacy lien, the MSA analyst will need the full pharmacy record to build the drug cost projection. The MERIT is exactly what they need — a complete, itemized pharmaceutical treatment record from injury through the settlement date.

MSP Conditional Payments: The More Common Issue

For most PI attorneys, the MSP conditional payment process — not the MSA — is the Medicare issue that arises in nearly every settlement involving a Medicare beneficiary.

How it works:

1. Medicare pays for injury-related care (ER, surgery, inpatient, physician visits, Part D prescriptions) during the treatment period
2. Medicare notifies the plaintiff and attorney through the Benefits Coordination & Recovery Center (BCRC)
3. At settlement, the MSP lien must be satisfied from settlement proceeds
4. The plaintiff's attorney has a legal obligation to notify Medicare of the settlement and satisfy the conditional payment

Pharmacy lien and MSP intersection:

• If Medicare Part D paid for injury-related prescriptions, Medicare's conditional payment lien covers those amounts
• If the same prescriptions were covered under a pharmacy lien (not Medicare Part D), there is no Medicare conditional payment for those fills — only the pharmacy lien

Clients who enrolled in LienScripts at referral and used the pharmacy lien for their medications are NOT generating Medicare conditional payment exposure for those drugs — they are filling through the lien program, not through Medicare Part D.

[!KEY] PI clients enrolled in a pharmacy lien program who fill medications through LienScripts — rather than through Medicare Part D — do not generate Medicare conditional payment exposure for those fills. The pharmacy lien and Medicare Part D are mutually exclusive for any given prescription, which simplifies the MSP analysis at settlement.

Medicare Eligibility Timing in PI Cases

Not every PI client is a Medicare beneficiary — but some will become eligible during the settlement timeline:

• Age: Clients 62–65 who are approaching Medicare eligibility at time of injury may become eligible before the case resolves
• Disability: Clients receiving Social Security Disability Insurance (SSDI) become Medicare-eligible after 24 months of SSDI payments — a long period that can overlap with a PI case

For these "soon-to-be-eligible" clients, the MSA and MSP considerations apply prospectively: if the client will be on Medicare before the expected settlement date, the MSP framework will likely apply.

[!WARNING] Failing to address Medicare's conditional payment rights before distributing settlement funds can expose the attorney to direct liability to Medicare for up to double the conditional payment amount under 42 U.S.C. § 1395y(b)(3)(A). Always check Medicare status for any client over 62, any SSDI recipient, or any client with end-stage renal disease or ALS.

Related Resources

• Medicare Conditional Payments and Pharmacy
• Dual-Eligible Medicare/Medicaid PI Liens
• What Is a Super Lien in a Personal Injury Case?
• What Is a Pharmacy Lien?
• Premises Liability and Pharmacy Lien: A Case Study

[!SOURCE] CMS WCMSA Reference Guide (current version) — The CMS Workers' Compensation Medicare Set-Aside reference guide, governing the WCMSA submission and review process including thresholds, drug cost projections, and account administration requirements.

[!SOURCE] 42 U.S.C. § 1395y(b) — Medicare Secondary Payer Statute — The federal Medicare Secondary Payer statute establishing Medicare's conditional payment rights, the basis for all MSP lien obligations in PI settlements.