Medical price inflation cooled for the fourth consecutive year in 2007, but experts say the stage is set for health costs to rebound with a vengeance. In 2007, premiums for family coverage increased 6.1 percent, the slowest growth rate since 1999. Premiums rose an average of 7.7 percent in 2006. A return to double digit inflation would be jarring--affordability already troubles many families and business.