| Major National Health Plans | Enrollment* |
| WellPoint | 34.2 million |
| United Health Group | 34.0 million |
| Aetna U.S. Healthcare | 17.8 million |
| Health Care Service Corporation | 12.4 million |
| Cigna HealthCare | 11.4 million |
| Humana | 11.0 million |
| Kaiser Permanente | 8.7 million |
| Coventry Health Care | 4.6 million |
| HealthNet | 2.9 million |
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