Between 2018 and 2023, Medicaid spending on psychiatric evaluation, individual psychotherapy, and crisis intervention grew from $2.14 billion to $5.52 billion. That's more than 2.5x in five years, with no single federal policy driving it. The expansion happened across states, across provider types, and across procedure categories simultaneously. Then, in 2024, spending fell and claims dropped from 57.9 million to 48.1 million. What looked like a durable expansion may have been something more complicated.

Texas Rewrote the State Rankings in Four Years

No state-level number in this dataset is harder to explain away than Texas. In 2019, Texas billed $46.3 million in Medicaid behavioral health procedures across the tracked codes. By 2023, that figure was $1.36 billion, a 2,844.9% increase. For context, New Jersey entered 2019 with $1.40 billion in behavioral health spending on these codes and ended 2023 at $1.98 billion, a 41.9% increase. Texas, starting from a fraction of New Jersey's base, ended up in the same neighborhood.

The enrollment gap makes this more striking, not less. By 2023, Texas had 5.7 million Medicaid enrollees compared to New Jersey's 2.2 million. But Texas's spending per enrollee on these codes was $238.89, while New Jersey's was $918. Pennsylvania, which grew 1,608% over the same period, landed at $272.89 per enrollee. The divergence in growth rates across states with different enrollment sizes and baseline spending levels is wide enough that uniform national trends can't explain it.

What this means for the program: when a single state's spending on a narrow set of procedure codes grows nearly 29-fold in four years, the aggregate national numbers become difficult to interpret as a measure of access improvement alone.

Psychotherapy Spending Dominates, Crisis Intervention Doesn't Follow

Individual psychotherapy drove the expansion. Spending on those codes grew from $1.87 billion in 2018 to $4.92 billion in 2023, accounting for the overwhelming majority of total behavioral health growth. Psychiatric evaluation spending grew more modestly, from $257 million to $598 million over the same period.

Crisis intervention tells a different story. Spending on crisis codes peaked at $8.98 million in 2023 and fell to $5.93 million in 2024, the lowest level since 2019. Total crisis intervention claims were 74,874 in 2023, roughly the same as in 2018. Across a five-year period when psychotherapy claims grew by more than 23 million annually, crisis intervention volume was essentially flat.

That gap matters. Crisis intervention is the service most likely to reach Medicaid enrollees in acute distress who aren't already connected to ongoing outpatient care. Its stagnation, while routine psychotherapy spending more than doubled, suggests the expansion reached people who were already engaged with the system more than those who weren't.

Spending Is Concentrating in Fewer Providers

The provider-level data adds another dimension. The number of providers billing the top behavioral health codes grew from 21,998 in 2020 to a peak of 28,564 in 2023, then fell to 25,805 in 2024. That contraction coincided with a sharp increase in spending concentration.

In 2020, the top 1% of billing providers, roughly 220 providers, captured 26.9% of spending on the tracked codes. By 2024, 259 providers captured 36.3% of $2.48 billion in total spending, or $901 million. The concentration ratio rose even as the total provider pool shrank.

The District of Columbia illustrates what high-concentration spending can look like at the state level. With only 262,771 Medicaid enrollees, DC had the highest per-enrollee behavioral health spending in the dataset at $964.25 in 2023. Iowa, with 762,073 enrollees, was second at $821.78. Both figures are multiples of what most large states spend per enrollee.

A program where 259 providers account for more than a third of spending on core behavioral health codes is structurally different from one where that spending is distributed across tens of thousands of practitioners. Whether that concentration reflects the economics of high-volume specialty practices or something else, the 2024 data shows it intensifying even as overall spending and claims declined. The providers who remained after the 2023 peak billed more per provider, not less.