The nation’s Medicaid program is entering a new phase of eligibility enforcement after Congress and President Donald Trump approved major policy changes in 2025. Across the country, state agencies that determine Medicaid eligibility are now trying to reprogram aging computer systems fast enough to handle the new rules, and health policy groups say that pressure is increasing the odds that eligible residents will be cut off. Federal data shows Medicaid and CHIP still covered about 74.3 million people in March 2026, underscoring how many Americans could be affected by system failures and administrative errors.
New federal deadlines are forcing large Medicaid system changes
The federal agency driving the implementation is the Centers for Medicare & Medicaid Services, which on March 6, 2026, issued State Medicaid Director letter 26-001 ordering states to begin six-month eligibility renewals for certain adults under Public Law 119-21, the 2025 law Trump signed on July 4, 2025. CMS guidance and state policy analyses show that states must now rebuild eligibility workflows around more frequent redeterminations, new exemption rules and additional verification steps. Those changes land on systems that already manage applications, renewals, notices and data matching for tens of millions of people.
The scale is national. CMS reported that 74,294,361 people were enrolled in Medicaid and CHIP in March 2026, including 67.1 million in Medicaid and 7.2 million in CHIP, according to the agency’s latest eligibility operations snapshot. AP has also reported that states must implement the new Medicaid work requirement by 2027, adding another major administrative deadline on top of the renewal changes.
Policy specialists say the risk is not only that ineligible people are removed, but that eligible people are lost in the process. AP reported in 2025 that every added document request can cause coverage losses, and advocates told the news service that state agencies would have to rework computer systems while absorbing funding pressure and compressed timelines.
The immediate impact is national rather than tied to a single city or county, because Medicaid eligibility systems are run state by state under federal deadlines. What is confirmed is that states are being required to update applications, renewal forms, immigration-status checks and information technology systems ahead of federal compliance dates, including an October 1, 2026 implementation point for some eligibility restrictions described in CMS guidance.
What is not yet publicly known is which states will experience the highest denial rates, the longest backlogs or the largest number of wrongful terminations tied specifically to software problems. CMS has not released a nationwide list of states with eligibility-system failures linked to the new law, and many states are still building their processes. That leaves residents with an uneven picture of what to expect locally.
There are, however, warning signs. AP reported that Democratic officials in 25 states and the District of Columbia sued the Trump administration in late June 2026 over its work-requirement guidance, arguing that the rules could block eligible people from care. That legal fight highlights how implementation problems are expected to vary sharply depending on a state’s technology, staffing and policy choices.
The underlying cause is the volume and complexity of the new work. CMS guidance requires more frequent renewals, while separate federal instructions require states to update immigration-status verification and related eligibility processing. The Center on Budget and Policy Priorities said the administration’s medical-frailty rule also disrupted state plans by making it harder to automatically identify exempt people using existing Medicaid data.
CBPP said states may have to redefine medical frailty, rebuild code lists, reprogram eligibility and claims systems, revise screening questions and rewrite notices. That means the problem is not a single software defect but a broad redesign of how eligibility is checked. AP similarly reported that some conditions that should trigger exemptions, including mental illness or substance use disorder, are not currently tracked in Medicaid computer systems in a way that makes automatic exemption easy.
For residents, the practical takeaway is that more renewals, more notices and more documentation requests are likely before the federal schedule is fully in place. Coverage losses may not always reflect a final finding that someone is ineligible; they can also result from missed paperwork, delayed verification or systems that cannot correctly process exemptions on time, according to AP, CMS guidance and health policy analyses. The next major benchmark is 2027, when states must have the Medicaid work requirement operating under current federal law.