Last year, some Virginians who got their insurance through Optima Health, a company owned by Sentara Healthcare, saw a massive spike in premiums. They’re still trying to figure out why their rates rose up to 170 percent. Dr. Rick Shannon sits at his desk at the University of Virginia, studying a map of the state that appeared in the local paper. As head of Health Affairs at UVA, he’s concerned about a dramatic increase in premiums for individual and single-family coverage in communities served by Sentara. That’s the parent company of insurer Optima Health and hospitals in five different parts ...