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MA Enrollment Explorer / States / Iowa

Medicare Advantage in Iowa: enrollment, penetration and market share

268,356 people in Iowa were enrolled in Medicare Advantage in October 2026. 37.6% of the state's 713,920 eligible Medicare beneficiaries are in Medicare Advantage, −0.9 pts since October 2025. CVS Health Corporation is the largest parent organization with 31% of reported enrollment; 18 parent organizations have 11 or more members, and the market's HHI is 2,053 (highly concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Iowa changed by −3,275 (−1.2%).

37.6%MA penetration, October 2026
268KMA enrollees
18parent organizations (11+ members)
2,053HHI, highly concentrated
Open Iowa on the market mapMSSP ACOs in Iowa

Parent organizations in Iowa

Parent organizationMembersChangeShareShare change
CVS Health Corporation81,245+15,26530.6%+5.9 pts
UnitedHealth Group, Inc.70,866−36,21726.7%−13.5 pts
Humana Inc.36,218+8,20413.6%+3.1 pts
Blue Cross Blue Shield of Michigan Mutual Ins. Co.33,261−73512.5%−0.2 pts
Medical Associates Clinic, P.C.13,876+3635.2%+0.2 pts
Centene Corporation12,881+8,8244.8%+3.3 pts
Trinity Health Corporation8,203+4,4293.1%+1.7 pts
Elevance Health, Inc.4,108−1,8821.5%−0.7 pts
Mitchell Family Office1,434+2660.5%+0.1 pts
Molina Healthcare, Inc.883new0.3%+0.3 pts
Medica Holding Company797+2440.3%+0.1 pts
Immanuel442+220.2%+0.01 pts
Iowa Health System414+1520.2%+0.1 pts
Devoted Health, Inc.363new0.1%+0.1 pts
University of Wisconsin Hospitals and Clincs Autho258−63under 0.1%−0.02 pts
Sanford Health187+110under 0.1%+0.04 pts
Highmark Health154+6under 0.1%+0.00 pts
Health Care Service Corporation68+41under 0.1%+0.02 pts

Change and share change are since October 2025. Shares are of reported enrollment in the CMS State/County/Contract file.

Counties

CountyMA enrolleesPenetrationLeading parent
Polk County40,60944.3%UnitedHealth Group, Inc. 37%
Linn County23,51548.3%CVS Health Corporation 42%
Scott County18,31248.1%CVS Health Corporation 43%
Black Hawk County14,30649.5%UnitedHealth Group, Inc. 46%
Dubuque County14,29960.9%Medical Associates Clinic, P.C. 73%
Pottawattamie County10,11145.8%UnitedHealth Group, Inc. 44%
Woodbury County9,24545.3%CVS Health Corporation 53%
Johnson County8,57032.8%CVS Health Corporation 37%
Dallas County6,46237.5%CVS Health Corporation 37%
Clinton County5,10743.2%CVS Health Corporation 37%
Warren County4,92642.4%UnitedHealth Group, Inc. 36%
Story County4,40227.2%UnitedHealth Group, Inc. 46%
Jasper County3,85442.2%UnitedHealth Group, Inc. 34%
Marshall County3,77941.7%UnitedHealth Group, Inc. 38%
Muscatine County3,59837.5%CVS Health Corporation 33%
Wapello County3,43843.6%UnitedHealth Group, Inc. 34%
Cerro Gordo County3,40327.7%UnitedHealth Group, Inc. 25%
Des Moines County3,18431.3%UnitedHealth Group, Inc. 33%
Webster County2,89033.9%CVS Health Corporation 36%
Marion County2,73334.0%CVS Health Corporation 27%
Jackson County2,58747.7%Medical Associates Clinic, P.C. 43%
Benton County2,44939.1%CVS Health Corporation 41%
Jones County2,35645.6%CVS Health Corporation 35%
Boone County2,23733.8%UnitedHealth Group, Inc. 27%
Jefferson County2,22445.5%Humana Inc. 27%
Lee County2,14924.2%Humana Inc. 32%
Buchanan County2,01740.3%UnitedHealth Group, Inc. 33%
Bremer County1,99533.7%CVS Health Corporation 42%
Mahaska County1,89037.1%Humana Inc. 24%
Washington County1,85133.0%CVS Health Corporation 30%
Clayton County1,82334.9%Medical Associates Clinic, P.C. 34%
Fayette County1,73732.3%UnitedHealth Group, Inc. 34%
Plymouth County1,70028.1%CVS Health Corporation 51%
Cedar County1,67536.1%CVS Health Corporation 40%
Delaware County1,64236.8%CVS Health Corporation 32%
Tama County1,63039.4%CVS Health Corporation 39%
Madison County1,58042.2%UnitedHealth Group, Inc. 35%
Iowa County1,46434.4%CVS Health Corporation 44%
Appanoose County1,45441.8%Trinity Health Corporation 24%
Poweshiek County1,41231.1%CVS Health Corporation 41%
Hardin County1,34330.2%UnitedHealth Group, Inc. 26%
Henry County1,32628.0%UnitedHealth Group, Inc. 29%
Butler County1,29732.9%UnitedHealth Group, Inc. 36%
Mills County1,22434.5%UnitedHealth Group, Inc. 35%
Floyd County1,17028.5%UnitedHealth Group, Inc. 28%
Grundy County1,16737.2%CVS Health Corporation 33%
Harrison County1,12830.3%UnitedHealth Group, Inc. 30%
Carroll County1,12420.5%CVS Health Corporation 45%
Dickinson County1,12218.8%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 48%
Page County1,10026.7%CVS Health Corporation 34%
Guthrie County1,08133.4%CVS Health Corporation 63%
Cass County93224.8%UnitedHealth Group, Inc. 37%
Monona County93037.5%CVS Health Corporation 41%
Hamilton County91925.3%CVS Health Corporation 30%
Keokuk County91336.0%UnitedHealth Group, Inc. 24%
Greene County90936.0%CVS Health Corporation 45%
Allamakee County90223.0%CVS Health Corporation 38%
Louisa County89934.9%Humana Inc. 29%
Clarke County89340.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 48%
Montgomery County88731.3%CVS Health Corporation 27%
Union County87328.1%CVS Health Corporation 44%
Crawford County84923.5%CVS Health Corporation 34%
Clay County84419.2%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 33%
Buena Vista County83220.3%Humana Inc. 30%
Sioux County81311.8%CVS Health Corporation 35%
Shelby County81123.7%CVS Health Corporation 44%
Winneshiek County80214.5%CVS Health Corporation 46%
Lucas County79435.1%CVS Health Corporation 35%
Chickasaw County73824.1%CVS Health Corporation 38%
Wright County73423.6%CVS Health Corporation 33%
Kossuth County73316.8%UnitedHealth Group, Inc. 27%
Calhoun County70425.4%CVS Health Corporation 38%
Cherokee County67921.6%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 32%
Decatur County65635.0%CVS Health Corporation 31%
Monroe County64933.2%UnitedHealth Group, Inc. 23%
Winnebago County64523.2%Trinity Health Corporation 25%
Van Buren County63232.4%CVS Health Corporation 39%
O'Brien County62017.5%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 34%
Davis County57730.4%CVS Health Corporation 40%
Wayne County56433.0%CVS Health Corporation 24%
Fremont County52727.0%CVS Health Corporation 44%
Humboldt County52221.7%UnitedHealth Group, Inc. 35%
Lyon County50820.3%CVS Health Corporation 40%
Adair County50426.7%CVS Health Corporation 47%
Hancock County49818.1%UnitedHealth Group, Inc. 23%
Worth County49525.2%Trinity Health Corporation 23%
Pocahontas County49024.9%CVS Health Corporation 32%
Mitchell County48817.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 63%
Franklin County48519.4%UnitedHealth Group, Inc. 25%
Howard County45118.8%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 55%
Sac County44816.7%CVS Health Corporation 37%
Emmet County43517.6%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 36%
Ida County37421.1%CVS Health Corporation 49%
Palo Alto County34414.7%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 42%
Audubon County31719.5%CVS Health Corporation 37%
Ringgold County29220.6%CVS Health Corporation 30%
Osceola County29018.7%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 33%
Taylor County27617.0%CVS Health Corporation 53%
Adams County18216.6%CVS Health Corporation 35%