Policy levers and delivery-system response

Whether a coverage rule, regulatory waiver, or payment policy reshapes the delivery system depends on how providers respond. This thread examines provider and system response across changes including Medicaid Section 1115 SUD IMD waivers, Medicare's coverage of opioid treatment programs, COVID-era telehealth flexibilities for opioid use disorder, prior-authorization requirements, and crisis intervention teams — using physician surveys, descriptive evaluation, quasi-experimental designs, and policy commentary across the individual papers.

A central question across this thread is when provider behavior changes within existing facilities, and when access shifts because of facility entry and exit. The distinction has direct implications for how policy effects are estimated and for which levers translate into durable access gains. Recent difference-in-differences work finds that a substantial share of the access improvement under one Medicaid waiver came from facility opening and closure rather than incumbent practice change, with implications for how similar payment reforms are evaluated and projected. Policy designs and evaluations that ignore market entry and exit may under- or over-predict their own effects, an open question that motivates current work in this area.