Centene holds the largest share of the ACA exchange market in the U.S., at 15 percent, according to a study from the American Medical Association.
The study, published Nov. 1, analyzed payers' market share at the city and state level for commercial, exchange and Medicare Advantage markets.
Here is the largest payer on the ACA exchange market in each state:
Alabama
Blue Cross Blue Shield of Alabama — 96 percent market share
Alaska
Premera — 92 percent market share
Arizona
Centene — 52 percent market share
Arkansas
Blue Cross Blue Shield of Arkansas — 57 percent market share
California
Kaiser Permanente — 38 percent market share
Colorado
Anthem — 28 percent market share
Connecticut
EnblemHealth — 78 percent market share
Delaware
Highmark — 100 percent share
District of Columbia
CareFirst Blue Cross Blue Shield — 82 percent market share
Florida
Blue Cross Blue Shield of Florida — 55 percent market share
Georgia
Centene — 62 percent market share
Hawaii
Hawaii Medical Service Association (Blue Cross Blue Shield of Hawaii) — 68 percent market share
Idaho
Intermountain — 39 percent market share
Illinois
Health Care Services Corporation — 71 percent market share
Indiana
CareSource — 60 percent market share
Iowa
Wellmark Blue Cross Blue Shield — 51 percent market share
Kansas
Blue Cross Blue Shield of Kansas – 52 percent market share
Kentucky
CareSource — 62 percent market share
Louisiana
Blue Cross Blue Shield of Louisiana — 97 percent market share
Maine
Point32Health — 41 percent market share
Maryland
CareFirst Blue Cross Blue Shield — 66 percent market share
Massachusetts
Point32Health — 55 percent market share
Michigan
Blue Cross Blue Shield of Michigan — 64 percent market share
Minnesota
UCare — 46 percent market share
Mississippi
Centene — 74 percent market share
Missouri
Centene — 43 percent share
Montana
Health Care Services Corporation — 38 percent market share
Nebraska
Medica — 82 percent market share
Nevada
UnitedHealthcare — 56 percent market share
New Hampshire
Centene — 48 percent market share
New Jersey
Horizon Blue Cross Blue Shield — 48 percent market share
New Mexico
Molina Healthcare —56 percent market share
New York
Centene — 41 percent market share
North Carolina
Blue Cross Blue Shield of North Carolina — 76 percent market share
North Dakota
Blue Cross Blue Shield of North Dakota — 66 percent market share
Ohio
Centene — 30 percent market share
Oklahoma
Health Care Services Corporation — 78 percent market share
Oregon
Providence Health — 31 percent market share
Pennsylvania
Independence Health Group — 34 percent market share
Rhode Island
Neighborhood Health Plan — 80 percent market share
South Carolina
Blue Cross Blue Shield of South Carolina — 83 percent market share
South Dakota
Avera Health — 55 percent market share
Tennessee
Cigna — 45 percent market share
Texas
Molina Healthcare — 33 percent market share
Utah
Intermountain — 82 percent market share
Vermont
MVP Healthcare — 61 percent market share
Virginia
Anthem — 47 percent market share
Washington
Kaiser Permanente — 26 percent market share
West Virginia
Highmark — 58 percent market share
Wisconsin
Common Ground — 27 percent market share
Wyoming
Blue Cross Blue Shield of Wyoming — 91 percent market share