http://www.chcf.org/articles/2016/11/dynamics-decline-truth-hmos

California’s commercial health maintenance organization population shrank from 11.9 million to 9.8 million enrollees between 2004 and 2015 (see figure below), a 17.5% decline. But the decline has not been consistent across all HMOs — Kaiser’s commercial enrollment has actually grown during this period.

Two new publications from CHCF take a closer look at how commercial managed care enrollment (including individual enrollment) and the public sector’s embrace of managed care are shifting the way physician organizations are paid — important trends that could affect California’s delivery system.