2/15/2012

The share of enrollees in the top three Medicare Part D plan sponsors -- UnitedHealthcare, CVS Caremark and Humana -- increased from 48% in 2011 to 57% a year later, driven in part by acquisitions and preferred pharmacy networks, writes industry expert Adam Fein. The growth puts the plans in a stronger position to negotiate prices with drugmakers, according to Fein.

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