Seniors’ out-of-pocket maximum in Medicare Part D is set to increase 25% in 2020, and lawmakers have shown no indication that they will address the problem before the end of 2019. The issue is caught in a complicated political landscape, as drug makers and patients would benefit from some changes to the so-called Medicare Part D “cliff” and insurers would be hurt. Because a formula in the Affordable Care Act is set to expire in 2020, the true out-of-pocket maximum...