By Susan Jaffe   At least a quarter of a million Medicare beneficiaries may receive bills for as many as five months of premiums they thought they already paid. But they shouldn’t toss the letter in the garbage. It’s not a scam or a mistake.   Because of what the

By Rachel Bluth   It was back-to-school day at the Senate Finance Committee hearing April 9. In the third of a series of hearings on rising drug prices, the senators seemed focused on getting an answer to one central question: What the heck is a pharmacy benefit manager? Pharmacy benefit managers,