The history of Highmark began during the 1930s when the Blue Cross and Blue Shield movement was formed. Highmark’s predecessor companies were established to help Pennsylvania’s residents pay for health care. Blue Cross of Western Pennsylvania (now Highmark Blue Cross Blue Shield) and the Pennsylvania Medical Society backed the founding of Pennsylvania Blue Shield (now Highmark Blue Shield) operated as separate entities until 1996.
The consolidation of Blue Cross of Western Pennsylvania and Pennsylvania Blue Shield, resulted in Highmark Inc. Highmark began operations on December 6, 1996.
In 2010, Blue Cross Blue Shield of Delaware signed an affiliation agreement with Highmark. In order to reflect its relationship with Highmark, Blue Cross Blue Shield of Delaware became Highmark Blue Cross Blue Shield Delaware (Highmark Delaware) in 2012.
In 2015, Highmark merged with Blue Cross of Northeastern Pennsylvania (BCNEPA).