Anthem topped the list of payers by total membership, while Aetna saw the smallest growth in 2021.
Here are the largest six payers ranked by their 2021 membership:
1. Anthem: 45.4 million members (up 5.7 percent year over year)
2. UnitedHealthcare: 45.1 million members (up 5 percent year over year)
3. Centene: 26.6 million members (up 4.3 percent year over year)
4. Aetna: 23.8 million members (up 0.4 percent year over year)
5. Cigna: 17.1 million members (up 2.6 percent year over year)
6. Humana: 9.8 million members (up 3.1 percent year over year)