Consumers who have complex medical diagnoses that requirespecialty drugs should carefully examine the health insurance plansoffered through the public exchange system to avoid incurringhigh costs for those drugs. But that task willbe complicated by inaccuracies on the public exchange website.

That’s the conclusion of an analysis of public exchange plans byAvalere Health. The study, in which researchers went through allavailable plans looking for “hidden” drug costs, found that silverplans in particular tend to place such drugs in specialty tiers intheir 2015 formularies. Avalere said that 17 percent of silver plans contain two or more specialtydrug tiers that will drive up out-of-pocket costs for those patients coveredby the plans.

Even consumers who do their homework to try to avoid such costsmay still wind up incurring them because of inaccurate data aboutout-of-pocket costs for drugs that can be found on the federalexchange website HealthCare.gov.