Health Plan Enrollment

Health Plan

HMO Enrollment

Kaiser Foundation Health Plan, Inc.

5,829,247

AETNA Health Inc.

2,843,548

CareFirst BlueCross BlueShield

1,624,321

Blue Shield of California

1,194,274

Blue Cross Blue Shield of Massachusetts

828,565

Blue Cross and Blue Shield of Illinois

826,528

Blue Cross Blue Shield of Michigan

700,000

Medical Mutual of Ohio

527,071

HIP Health Plan of New York, Inc.

451,471

Kaiser Foundation Health Plan of the Mid-Atlantic States, Inc.

425,615

Source: AIS's Directory of Health Plans: 2009, Copyright © 2009 Atlantic Information Services.