Medicare spent $2 billion for one drug as the manufacturer paid doctors millions

(CNN) -- More than 80% of doctors who filed Medicare claims in 2016 for H.P. Acthar Gel -- a drug best known for treating a rare infant seizure disorder -- received money or other perks from the drugmakers, according to a CNN analysis of publicly identified prescribers.

The analysis, which looked at doctors who filed more than 10 Part D claims, found that the drugmakers -- Mallinckrodt and Questcor -- paid 288 prescribers more than $6.5 million for consulting, promotional speaking and ot...