BOSTON - A federal judge struck down a Trump administration rule that would have required chronically ill Medicaid recipients to prove that their conditions significantly impaired their ability to work before receiving a medical-frailty exemption.

U.S. District Judge Richard Stearns ruled Thursday that the Centers for Medicare and Medicaid Services exceeded the authority Congress gave it when the agency narrowed the exemption. His decision vacated the disputed language nationwide and permanently barred its enforcement against the states that challenged it.

The ruling in Massachusetts v. Oz was a partial victory for a coalition of 25 states and the District of Columbia. It did not invalidate the broader Medicaid work requirements created by the 2025 law known as the One Big Beautiful Bill, and it left two other verification restrictions in place.

The law requires many adults between 19 and 64 to document work, education, training or volunteer activity to maintain Medicaid coverage beginning in 2027. Congress expressly exempted people considered medically frail, including some people with disabling mental disorders, substance-use disorders, significant disabilities, or serious or complex medical conditions.

CMS added a second test in an interim rule issued in June. A person could have one of those qualifying conditions but would still need to demonstrate that it significantly impaired compliance with the work requirement. The states argued that the agency had converted a medical-status exemption written by Congress into a separate ability-to-work test.

Stearns agreed that the additional restriction contradicted the statute. He found that states faced costly changes to their eligibility systems and that enforcing an unlawful definition could cause vulnerable people to lose coverage and continuity of care.

The judge also gave the plaintiff states and Washington, D.C., a six-month period of protection from federal enforcement involving medical-frailty determinations while they revise their systems. The general Jan. 1, 2027, implementation date for the work requirements remains unchanged.

The administration prevailed on two other disputed provisions. States may generally reject medical claims or encounter data more than 12 months old when deciding whether someone is medically frail, and they may accept only one self-attestation during a continuous enrollment period.

Those limits mean patients may still have to obtain current documentation and navigate repeated administrative reviews. The American Medical Association, which supported the challenge, said claims data often record a diagnosis or treatment but do not explain whether a person can satisfy a work rule.

The case therefore does not end the national argument over Medicaid work requirements. It removes one layer of proof from the medical-frailty exemption while preserving the larger system Congress enacted and much of the federal process for verifying eligibility.

Paperwork can remove coverage without changing the law

Supporters of work requirements argue that public benefits should encourage employment and that governments need reliable evidence when granting exemptions. Those are legitimate policy goals. A program serving tens of millions of people cannot operate entirely on assumptions or ignore fraud.

But an eligibility system can become punitive even when its formal rules appear reasonable. People with cancer, serious mental illness or unstable chronic disease may miss a notice, lack a recent record or be unable to obtain a doctor's statement before a deadline. The resulting loss of coverage can look like enforcement in a database while functioning as denial of treatment in real life.

That is why the distinction in Stearns' ruling matters. Congress wrote categories of medically frail people into the exemption. An executive agency may administer that protection, but it cannot quietly make the category narrower by adding a test lawmakers did not enact. Democratic government depends on agencies following statutes even when an administration prefers a different policy.

The judgment also shows the limits of courtroom victories. The work requirement survives. The 12-month evidence rule and restriction on self-attestation survive. States still have to rebuild systems on a compressed schedule, while patients and doctors will bear much of the burden when records do not fit administrative definitions.

A responsible implementation should verify eligibility without designing failure into the process. States can use existing clinical data, give clear notice, allow corrections and connect patients with human assistance before terminating coverage. The federal government can publish transparent standards and measure how many eligible people lose benefits for procedural reasons.

Healthcare policy is often described through budgets and incentives, but the real exercise of power occurs in forms, deadlines and computer rules. The court blocked one unsupported barrier. Whether vulnerable Americans remain covered will depend on what replaces it and whether government treats administrative accuracy as more important than simply reducing enrollment.