An amendment to the GOP's repeal plan would dole out $15 billion to insurers over nine years to help cover the costs of sick, expensive patients. Lawmakers say the new funds would bring down premiums for healthy people by subsidizing medical costs for people with especially high expenses. Under ObamaCare, insurers are required to charge everyone of the same age the same amount for premiums, regardless of their medical history or conditions. That means costs are spread out among healthy and sick people, and insurers would essential pass those costs on to healthy people. The $15 billion would help subsidize...