It is expected that the performance based contracting system can be put into place by health plans beginning in 2012. California's major plans -- Aetna, Anthem Blue Cross, Blue Shield of California, CIGNA, Health Net, PacifiCare/UnitedHealthcare, Western Health Advantage, Kaiser Permanente (reporting only) -- currently participate in the IHA sponsored pay for performance program. They contract with over 221 physician groups that are responsible for over 10 million lives.