At the heart of the Bazelon guide is a decision tree that outlines best-policy choices for states once the decision is made to expand the Medicaid program to cover the newly eligible group. The best option is to enroll all newly eligible individuals into the regular state program with full Medicaid coverage, according to the guide. However, the ACA outlines other approaches: providing full coverage to a defined population, such as those with serious mental illness, or creating a limited benchmark plan based on the ACA's Essential Health Benefit (EHB). Despite the best efforts of advocates, some states may opt for a limited plan, and the Bazelon guide outlines steps to ensure adequate—and parity—coverage, for example, by enhancing the EHB plan with wraparound services for children and adults with mental illness. The guide lists community services not explicitly stipulated in the EHB that the enhanced plans should include, such as skills training, assertive community treatment, peer support services, and therapeutic foster care for children. However, the administrative burden of operating a parallel system for some Medicaid enrollees is likely to outweigh any cost advantage of offering them a more limited package of services, the guide notes.