“‘Accountable care organizations’ is the health wonk phrase du jour. Obamacare’s advocates point to its support for ACOs as one of the important cost-control initiatives in the law. Except that, like nearly everything about Obamacare, the truth isn’t so simple. It turns out that the government’s idea of an accountable care organization is completely unworkable, to the point where nearly all leading health providers have declared it dead on arrival.”