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The 20 Largest Health Insurance Companies

Finding Health Insurance, Health

Size isn’t everything when you’re shopping for health insurance, but it certainly counts for something. Larger insurers are more likely to have your preferred doctors in their networks, and if you’re away from home and need in-network coverage, chances are better you’ll be able to find it.

Here are the 20 largest health insurance companies offering individual health plans, according to A.M. Best.

The largest health insurance companies

Company/groupMarket share
Source: A.M. Best.

Note: Companies ranked by 2015 health premiums written for individual health insurance plans. Group health insurance, such as the plans you buy through work, is not included. Data rounded to the nearest tenth of a percentage point.
1. Health Care Service Corp.
12%
2. Anthem
9%
3. Humana
7%
4. Blue Cross & Blue Shield of Florida
6%
5. Aetna
5.3%
6. Blue Cross & Blue Shield of North Carolina
4.4%
7. UnitedHealth Group
4.2%
8. Highmark
2.7%
9. Independence Blue Cross
2.2%
10. Blue Cross Blue Shield of Michigan
2.1%
11. CareFirst
1.9%
12. Arkansas Blue Cross / Blue Shield
1.7%
13. Horizon Healthcare Services
1.4%
14. Blue Cross & Blue Shield of Tennessee
1.4%
15. Blue Cross Blue Shield of Minnesota
1.4%
16. Premera
1.4%
17. Louisiana Health Services Group
1.4%
18. Blue Cross and Blue Shield of Alabama
1.4%
19. Centene
1.4%
20. Molina Healthcare
1.2%