State Enacted Legislation

Health Plan

PPO Enrollment

Blue Cross Blue Shield of Michigan

3,159,605

AETNA Health Inc.

1,676,786

Blue Cross and Blue Shield of Florida, Inc.

1,401,737

Blue Cross and Blue Shield of Illinois

1,343,914

Blue Shield of California

1,241,850

CIGNA HealthCare, Inc.

1,218,499

Group Health Incorporated (GHI)

1,178,843

Humana, Inc.

1,164,211

Blue Cross and Blue Shield of Alabama

1,008,156

Horizon Blue Cross Blue Shield

991,068

Source: AIS's Directory of Health Plans: 2010, Copyright © 2010 Atlantic Information Services.