Medicaid is the single largest payer of mental health and substance use treatment in the United States, according to an August 2025 Milbank Quarterly opinion piece by Emma McGinty and Magdalena Cerdá. A Commonwealth Fund explainer by Nathaniel Counts, published May 7, 2025, put the scale in dollars: using 2019 data, Medicaid spent more than … Continue reading How to bill Medicaid for mental health services: billing rules, codes, and documentation