How do insurers decide what medicines to pay for?

How do insurers decide what medicines to pay for?
By: TOM MURPHY, Associated Press March 17, 2017

Whether a drug even gets on the list can depend on whether a similar medicine is already in the market. When the ground-breaking hepatitis C treatments Sovaldi and Harvoni from Gilead Sciences debuted a few years ago, Express Scripts had to include them. They cost more than $80,000 for a course of treatment, but the drugs essentially cure a debilitating disease and they had no competition.

But once the drugmaker AbbVie produced a third option, Viekira Pak, with a similar cure rate, Express Scripts was able to negotiate a price discount and switched to covering only Viekira Pak.
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