Health care was a priority for midterm voters, and for good reason. In nearly five years since ObamaCare’s major provisions came into effect, insurance premiums have doubled for individuals and risen 140% for families, even while deductibles have increased substantially. Hospitals and doctors continue to flee ObamaCare’s coverage network, to the point that almost 75% of plans are now highly restrictive. ObamaCare also encouraged a record pace of consolidation among hospitals and physician practices. All these developments will raise health-care prices, as fewer hospitals compete for payers.

The...