Massachusetts has the most expensive family health insurance premiums in the country, according to a new analysis that highlights the state’s challenge in trying to rein in medical costs after passage of a landmark 2006 law that mandated coverage for nearly everyone... The report by the Commonwealth Fund, a nonprofit health care foundation, showed that the average family premium for plans offered by employers in Massachusetts was $13,788 in 2008, 40 percent higher than in 2003. Over the same period, premiums nationwide rose an average of 33 percent... Last month, the commission suggested that private and public insurers scrap their...