SACRAMENTO, Calif. (AP) — Spurred in part by former President Barack Obama's health care law, hospitals across the country have merged to form massive medical systems in the belief it would simplify the process for patients. But a simpler bill doesn't always guarantee a cheaper bill. That's a key issue in an antitrust lawsuit against one of California's largest hospital systems set to begin Monday. About 1,500 self-funded health plans have sued Sutter Health, a system that includes 24 hospitals across Northern California.