Health care stakeholders and experts are increasingly concerned that the Trump administration’s new rule expanding association health plans (AHPs) will undermine efforts to create parity between medical and mental health care services since AHPs are not required to cover the Affordable Care Act’s 10 essential health benefits. The rule expands the ability of employers to band together to create association health plans (AHPs) that supporters say offer consumers more coverage choices. However, detractors worry AHPs will destabilize existing markets and...