The workers' compensation Medicare set-aside is a settled ritual. The liability version is not, and that uncertainty is exactly why it gets ignored until it becomes a problem at disbursement. The Medicare Secondary Payer statute does not distinguish comp from liability when it protects the Medicare trust fund, but the administrative machinery that grew up around comp never fully crossed over. Plaintiff lawyers are left to manage a duty with no safe harbor.
The statute is clear; the process is a vacuum
The Medicare Secondary Payer statute, 42 U.S.C. 1395y(b), makes Medicare secondary to any primary plan, including a liability settlement, and prohibits Medicare from paying for care that a settlement was meant to cover. For past care, the conditional-payment recovery process is well defined and Medicare will chase its money. For future care, the statute's logic points to a set-aside, yet there is no mandatory review process for liability cases. The Centers for Medicare and Medicaid Services proposed a rule to govern liability set-asides and then withdrew it in October 2022, leaving practitioners with an obligation to consider Medicare's interests and no form to file that discharges it.
Why liability is not comp
The comp set-aside works because comp settlements allocate cleanly between indemnity and medical, and the carrier's future medical exposure is defined. Liability settlements are the opposite. A lump sum resolves a disputed claim in which liability, causation, and damages were all contested, and the recovery is almost always compressed by comparative fault, policy limits, and lien pressure. Forcing a full projected-cost set-aside onto a settlement that paid pennies on the dollar overfunds Medicare's interest and shortchanges the client. That tension is real, and CMS has never resolved it.
What CMS is actually watching now
Reporting has tightened even as the set-aside rules stayed vague. CMS has expanded Section 111 mandatory insurer reporting so that responsible reporting entities transmit far more detail about liability settlements, including amounts tied to future medical care. The practical effect is that the agency now has data it never had before, and a client who returns to Medicare for treatment of the same injury can be flagged. The days of assuming a modest liability settlement stays invisible are ending.
The options on the table
There is no single right answer, but there is a range of defensible approaches, and the file should show which one you chose and why.
- Document a reasoned analysis that no set-aside is required, supported by the treating physician's statement that no future injury-related care is anticipated. This is the most common path in disputed liability cases, and it belongs in writing.
- Obtain a formal allocation opinion from a set-aside vendor that prices future injury-related care and adjusts for the settlement's compromise, then fund an account against that figure.
- For larger cases with a Medicare-entitled or soon-entitled client, fund a professionally administered set-aside and let the administrator handle exhaustion and reporting.
Whichever route you take, the reduction argument matters. A set-aside for a case that settled at a fraction of full value should reflect that compromise, not the gross projected cost, and the analysis should say so in plain terms.
Disbursement mechanics
Handle the future-medicals question before the settlement statement is signed, not after. Resolve conditional payments for past care through the Medicare recovery contractor and get the final demand in hand, because that number is separate from any future-care set-aside and both hit the same disbursement. Where a client is close to Medicare eligibility, the timing of enrollment changes the calculus and should be part of the settlement conversation. Our lien and settlement coverage keeps returning to the same discipline: reduce every claim against the recovery, document the basis, and put the net-to-client number in front of the client with the Medicare piece already accounted for.
The takeaway
The liability set-aside is unsettled law with a real compliance floor. The duty to consider Medicare's interest exists even though the process to prove you did is missing. Pick an approach, ground it in the treating physician's view of future care, discount it for the settlement's compromise, and paper the file. Colleagues handling workers' compensation set-asides have a formal path to lean on, and readers watching the case-law developments should expect the liability side to stay ambiguous until CMS issues a rule it has withheld for years.