Optum is United Healthcare's pharmacy benefits manager, one of the three largest in the world, and Change Healthcare handles medical billing for a huge portion of the health care industry.

As the HMO industry navigates regulatory reforms, rising costs and public scrutiny, UnitedHealth Group Incorporated UNH is ...

Dozens of state attorneys general are urging Congress to pass a law prohibiting pharmacy benefit managers from simultaneously owning pharmacies, arguing such a move would boost competition and ...