http://www.npr.org/sections/health-shots/2016/08/15/489790412/will-your-prescription-meds-be-covered-next-year-better-check

The battle continues to rage between drug companies that are trying to make as much money as possible and insurers trying to drive down drug prices. And consumers are squarely in the middle.

That’s because, increasingly, prescription insurers are threatening to kick drugs off their lists of approved medications if the manufacturers won’t give them big discounts.