Here are the insurers and the number of markets where they hold the highest shares:
1. Anthem: 75
2. Health Care Service Corp.: 43
3. UnitedHealth Group: 28
4. Florida Blue: 22
5. Highmark: 21
Market concentration in all 384 metropolitan statistical areas was analyzed using the Herfindahl-Hirschman Index. Markets with an HHI of more than 2,500 points were classified as “highly concentrated,” per federal guidelines.
Click here to access the report.
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