In the massive litigation over side effects from the diabetes drug Avandia, a federal judge has dismissed all claims brought by insurers acting as "Medicare Advantage Organizations" or MAOs that demanded reimbursements from the settlements paid out by the drug’s maker, GlaxoSmithKline.

In the suit, Humana Medical Plan Inc. sought to represent a class of MAOs whose enrollees received treatment for Avandia-related injuries and who have since settled — or will in the future settle — with GSK.