Most Medicare Advantage markets are highly concentrated, but in a handful of markets, one payer controls more than 70% of the MA landscape, according to the American Medical Association's annual Competition in Health Insurance report.
The report, published Nov. 19, examines competition in commercial, individual and Medicare Advantage markets.
In 91% of Medicare Advantage markets, one insurer controlled more than 30% of the market. In just 4% of markets, one insurer had a more than 70% market share.
Here are the least competitive Medicare Advantage markets:
Casper, Wyo.
UnitedHealth Group: 92%
Cheyenne, Wyo.
UnitedHealth Group: 86%
Napa, Calif.
Kaiser Permanente: 82%
California-Lexington Park, Md.
UnitedHealth Group: 85%
Vallejo, Calif.
Kaiser Permanente: 82%
Dubuque, Iowa
Medical Associates: 79%
Jefferson City, Mo.
UnitedHealth Group: 77%
Santa Rosa-Petaluma, Calif.
Kaiser Permantente: 76%
Salinas, Calif.
Montage Health: 75%
Wenatchee, Wash.
Carle Health: 74%
Chico, Calif.
Elevance Health: 73%
Columbia, Mo.
UnitedHealth Group: 72%
St. Joseph Mo.-Kan.
UnitedHealth Group: 72%
Great Falls, Mont.
Humana: 71%
Wilmington, N.C.
Humana: 71%
Logan, Utah-Idaho
UnitedHealth Group: 70%
Read the full report here.