“The Department of Health and Human Services has released draft rule that governs Accountable Care Organizations. ACOs are groupings of health care providers who join together under specific rules in order to create shared savings. The idea is to bundle a single payment for a patient so that providers do not have incentives to prescribe additional services that generate additional fees. This sounds like a relatively simple concept, and it is worth exploring different ideas for needed payment reform. But the truth is, changing payment systems is far from simple. The devil is in the details about the ‘specific rules’ that define an ACO’s structure.”