A plan by Highmark Inc. to streamline its pharmacy network and a contract dispute between Walgreen Co. and Express Scripts, which manages UPMC Health Plan's pharmacy program, could have many Walgreens customers looking for a new pharmacy soon. Beginning in January, Highmark will begin its transition to a new network that will exclude Walgreens and Target pharmacies. The move, initially affecting about 100,000 members of Highmark's small group market, will be completed by Dec. 31, 2013, according to a statement from the insurer.
