Seventy-three % of U.S. business medical insurance markets have been extremely concentrated in 2022, in accordance with the latest annual report on medical insurance competitors by the American Medical Association. In 90% of metropolitan statistical space markets, no less than one insurer had a business market share of 30% or extra, and in 48% of MSAs a single insurer’s share was no less than 50%. Fifty-three % of markets that have been extremely concentrated in 2014 turned much more concentrated by 2022, the examine discovered. Among Medicare Advantage plans, UnitedHealth Group was the most important insurer by market share in 42% of MSAs.