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| Major National Health Plan | Enrollment* |
| WellPoint | 34.8 million |
| United Health Group | 17.3 million |
| Aetna U.S. Healthcare | 16.9 million |
| Humana | 11.5 million |
| Cigna HealthCare | 10.2 million |
| Kaiser Permanente | 8.7 million (a) |
| Coventry Health Care | 4.7 million |
| HealthNet | 3.8 million |
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