UnitedHealth to Buy Pharmacy Benefits Manager Catamaran

FILE - This Tuesday, Oct. 16, 2012, filephoto, shows a portion of The UnitedHealth Group Inc.'s  campus in Minnetonka, Minn. UnitedHealth Group Inc. releases quarterly results before the market opens on Thursday, Oct. 16, 2014. (AP Photo/Jim Mone, File)
FILE - This Tuesday, Oct. 16, 2012, filephoto, shows a portion of The UnitedHealth Group Inc.'s campus in Minnetonka, Minn. UnitedHealth Group Inc. releases quarterly results before the market opens on Thursday, Oct. 16, 2014. (AP Photo/Jim Mone, File)

The nation’s largest health insurer, UnitedHealth, has muscled up in its fight against rising specialty drug costs, spending more than $12 billion to buy pharmacy...

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