Timely access to Medicaid coverage offers many potential benefits to justice-involved adults reentering the community. In 2015 Indiana's Section 1115 Medicaid waiver (the Healthy Indiana Plan [HIP]) expanded eligibility for low-income adults. To expedite coverage for justice-involved adults, Indiana subsequently improved interagency coordination in two ways. First, the Indiana Department of Correction began initiating Medicaid applications for those in custody. Second, Medicaid began temporarily suspending coverage for people while they were incarcerated instead of discontinuing it. Prison release data from the Indiana Department of Correction linked to Medicaid enrollment data indicate that before HIP was implemented, approximately 9 percent of justice-involved adults received Medicaid coverage within 120 days of release. After HIP implementation, coverage rates increased by 9 percentage points. After both interagency coordination policies were implemented, an additional 29-percentage-point increase in coverage occurred. Furthermore, coverage effective within seven days of release increased by 14 percentage points after the interagency coordination policies went into effect. These findings support the notion that policies and procedures encouraging interagency coordination are beneficial in increasing timely access to Medicaid coverage for justice-involved people.