Many local Medicare Advantage markets are largely controlled by one payer, according to the American Medical Association.
The AMA's 2022 "Competition in Health Insurance" report, published Nov. 1, found that 34 percent of metropolitan areas have one payer with more than a 50 percent share of the Medicare Advantage market.
According to the report, in 91 percent of metropolitan areas, one payer has at least a 30 percent market share.
These are the cities where the largest payer controls less than 30 percent of the market:
Birmingham-Hoover, Ala.
UnitedHealthcare, 23 percent market share
Yuma, Ariz.
Banner Health, 29 percent market share
Homosassa Springs, Fla.
Humana, 26 percent market share
Atlanta-Sandy Springs-Alpharetta, Ga.
UnitedHealthcare, 28 percent market share
Kokomo, Ind.
Humana, 26 percent market share
Michigan City-La Porte, Ind.
Humana, 29 percent market share
Bangor, Maine
Martin's Point Health Care, 26 percent market share
Baltimore-Columbia-Towson, Md.
Kaiser Permanente, 27 percent market share
Springfield, Mass.
Blue Cross Blue Shield of Massachusetts, 29 percent market share
Worcester, Mass.-Conn.
Point32Health, 29 percent market share
Minneapolis-St.Paul-Bloomington, Minn.-Wis.
UCare, 28 percent market share
Joplin, Mo.
CVS Health, 27 percent market share
Springfield, Mo.
UnitedHealthcare, 28 percent market share
Santa Fe, N.M.
UnitedHealthcare, 27 percent market share
Binghamton, N.Y.
Lifetime Healthcare, 28 percent market share
Glens Falls, N.Y.
Humana, 23 percent market share
New York-Newark-Jersey City, N.Y.-N.J.-Pa.
UnitedHealthcare, 29 percent market share
Akron, Ohio
UnitedHealthcare, 25 percent market share
Canton-Massillon, Ohio
Aultman Health, 21 percent market share
Cleveland-Elyria, Ohio
Anthem, 27 percent market share
Mansfield, Ohio
Humana, 29 percent market share
Youngstown-Warren-Boardman, Ohio-Pa.
CVS Health, 29 percent market share
Salem, Ore.
UnitedHealthcare, 27 percent market share
Allentown-Bethlehem-Easton, Pa.-N.J.
CVS Health, 25 percent market share
Reading, Pa.
CVS Health, 28 percent market share
Clarksville, Tenn.-Ky.
Humana, 26 percent market share
Memphis, Tenn.-Miss.-Ark.
Humana, 24 percent market share
Wheeling, W.Va.-Ohio
Humana, 28 percent market share