The contract dispute between Highmark and UPMC allowed Aetna and other insurers that provide in-network access to UPMC to take over some of Highmark's market share in western part of Pennsylvania. As of January, Highmark had a 60 percent market share in Western Pennsylvania, a 29-county region, down from a 63 percent market share in January 2014.
The decrease in the insurer's market share was driven by a loss of 150,000 employer-group members "who were concerned about keeping discounted access to the UPMC's huge network of 20 hospitals and more than 3,500 physicians," according to the report.
On the other end of the spectrum, Aetna added approximately 150,000 members in Western Pennsylvania in the last year. That number includes new employer groups, individual policies and Medicare Advantage plans, a spokesperson for Aetna, Walt Cherniak, told TribLive. "The overwhelming majority of that new membership came from Highmark," Mr. Cherniak said.
Highmark is not discouraged by its membership numbers. Tony Benevento, senior vice president of Highmark's insurance business in Pennsylvania, told TribLive the health insurer "retained 87 percent of its commercial customers even though it faced unprecedented competition."