A Stockton couple is worried that they may face a bill of more than $70,000 for a hospital stay that was initially covered by insurance. Their health plan, Anthem Blue Cross, sent them a letter last month telling them that their insurance coverage has been canceled retroactively, back to the first day of the year -- and that they may be responsible for paying bills for medical care during that time. We called Anthem Blue Cross, and they said, ‘Well, we can cancel people whenever we want. We can do whatever we want,’” Xanttopulos said. A spokesman for Covered California...