CHICAGO — Where healthcare is concerned, "big data" are said to come with big problems, but data associated with so-called next-generation diagnostics are also problematic. An Oct. 7 session at AdvaMed 2014 tackled the subject of how payers react to requests for coverage for next-generation sequencing, and the consensus was that the evidence that exists is not particularly good. Further complicating matters is the fact that the volume of tests that are in queue for coverage decisions may soon overwhelm the ability of insurers to review it all.