President Barack Obama is correct when he says that “soaring health-care costs make our current course unsustainable.” Many Americans agree: 55% of respondents to a recent CNN poll think the U.S. health-care system needs a great deal of reform. Yet 70% of Americans are satisfied with their current health-care arrangements, and for good reason—they work.

Consumers are receiving quality medical care at little direct cost to themselves. This creates runaway costs that have to be addressed. But ill-advised reforms...