The Big Beautiful Bill Passed. Here's What Happens to 11 Million People in the Behavioral Health System.

The law passed. The Congressional Budget Office says it will result in 11.8 million people losing Medicaid coverage over ten years. An additional 3.1 million will lose coverage through downstream effects on the ACA. Taken together, it is the largest single rollback of public health coverage since the program’s creation in 1965.

For the behavioral health system, the word that keeps getting used is “devastating” — and for once, that’s not hyperbole.

Medicaid is the primary payer for substance use treatment in the United States. Among the 48.5 million Americans with a substance use disorder, a disproportionate share are Medicaid enrollees: people with low incomes, people who are unhoused, people whose addiction has disrupted their ability to maintain employer-sponsored coverage. The behavioral health system was built on the assumption of Medicaid as a floor. The One Big Beautiful Bill Act has moved the floor.

The mechanism matters here. The bill cuts $1 trillion from Medicaid over ten years, according to the AMA’s analysis — primarily through work requirements, eligibility re-verification timelines, and reductions to the federal matching rate. It also collapses three separate SAMHSA funding streams (the mental health block grant, the substance use block grant, and the State Opioid Response grant) into a single Behavioral Health Innovation Block Grant — at a budget approximately $500 million lower than the three programs it replaces.

Block grants give states flexibility. They also give states the option to prioritize other things. Historically, when categorical federal mandates disappear, the specific programs they funded — workforce development, harm reduction, rural outreach — are the first things cut at the state level. Opioid settlement advocates who spent years fighting for categorical harm-reduction earmarks spent years fighting for good reason.

NAMI’s statement after the bill passed was direct: the cuts are “devastating” to mental health and SUD care. The Hopkins Opioid Principles project estimated that state-level programs built on the existing grant structure would face immediate fiscal shocks even before the block grant transition takes effect.

The policy question that will define the next 18 months is whether states can absorb the gap. The available evidence from prior Medicaid rollbacks says they can’t. When states cut Medicaid SUD coverage in the 2011-2013 austerity period, treatment admissions dropped and overdose deaths rose in the affected populations. The relationship between coverage and outcomes is not decorative.

The new law is not scheduled to take full effect immediately — transitions are phased over several years. But the behavioral health system cannot plan in a transition. It can only plan around what funding is stable. Right now, very little is.

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