TRYNYTYhealth:enablement
MA Enrollment Explorer / States / Missouri

Medicare Advantage in Missouri: enrollment, penetration and market share

753,478 people in Missouri were enrolled in Medicare Advantage in October 2026. 54.6% of the state's 1,381,155 eligible Medicare beneficiaries are in Medicare Advantage, +0.2 pts since October 2025. UnitedHealth Group, Inc. is the largest parent organization with 45% of reported enrollment; 17 parent organizations have 11 or more members, and the market's HHI is 2,831 (highly concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Missouri changed by +9,038 (+1.2%).

54.6%MA penetration, October 2026
753KMA enrollees
17parent organizations (11+ members)
2,831HHI, highly concentrated
Open Missouri on the market mapMSSP ACOs in Missouri

Parent organizations in Missouri

Parent organizationMembersChangeShareShare change
UnitedHealth Group, Inc.335,519−28,12944.8%−5.0 pts
Humana Inc.167,347+72,89822.3%+9.4 pts
CVS Health Corporation121,447−18,39216.2%−2.9 pts
Lumeris Group Holdings Corporation45,391+2,9326.1%+0.3 pts
Devoted Health, Inc.27,007+22,4563.6%+3.0 pts
Elevance Health, Inc.26,678−34,4733.6%−4.8 pts
Blue Cross Blue Shield of Michigan Mutual Ins. Co.9,018−3741.2%−0.1 pts
Centene Corporation6,936+6490.9%+0.1 pts
CoxHealth4,337+5200.6%+0.1 pts
Health Care Service Corporation3,206+970.4%+0.00 pts
Rifkin Managed Care Holding, LLC1,340−740.2%−0.01 pts
Mitchell Family Office790+2470.1%+0.03 pts
Missouri Healthcare Advisors, LLC130+38under 0.1%+0.00 pts
Midwest Christian Villages, Inc.105+23under 0.1%+0.00 pts
Advocates for a Healthy Community, Inc.56+17under 0.1%+0.00 pts
Swope Health Services39+17under 0.1%+0.00 pts
Consolidated Assoc of Railroad Employees HC190under 0.1%−0.00 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
St. Louis County131,47957.8%UnitedHealth Group, Inc. 43%
Jackson County77,69956.4%UnitedHealth Group, Inc. 40%
St. Charles County53,31260.5%UnitedHealth Group, Inc. 44%
Greene County40,51261.8%UnitedHealth Group, Inc. 27%
Jefferson County34,20365.6%UnitedHealth Group, Inc. 38%
St. Louis City31,91364.4%UnitedHealth Group, Inc. 41%
Clay County23,63747.9%Humana Inc. 55%
Franklin County20,39974.3%UnitedHealth Group, Inc. 54%
Boone County15,69548.3%UnitedHealth Group, Inc. 62%
Jasper County13,64252.4%UnitedHealth Group, Inc. 32%
Cass County13,16253.9%UnitedHealth Group, Inc. 52%
Christian County12,49260.5%Humana Inc. 25%
Taney County9,92962.7%UnitedHealth Group, Inc. 29%
Cole County9,70956.1%UnitedHealth Group, Inc. 72%
St. Francois County9,62257.2%UnitedHealth Group, Inc. 52%
Platte County9,21144.2%Humana Inc. 56%
Lincoln County8,26362.7%UnitedHealth Group, Inc. 41%
Buchanan County7,13337.5%UnitedHealth Group, Inc. 88%
Camden County6,93649.1%UnitedHealth Group, Inc. 42%
Stone County6,68161.4%UnitedHealth Group, Inc. 31%
Laclede County6,36769.1%Humana Inc. 37%
Warren County6,36169.7%UnitedHealth Group, Inc. 53%
Newton County6,32345.8%UnitedHealth Group, Inc. 31%
Cape Girardeau County6,24534.6%UnitedHealth Group, Inc. 70%
Webster County6,12666.8%UnitedHealth Group, Inc. 28%
Howell County6,11654.8%UnitedHealth Group, Inc. 36%
Lawrence County5,93762.1%UnitedHealth Group, Inc. 30%
Barry County5,70661.4%UnitedHealth Group, Inc. 30%
Callaway County5,57553.2%UnitedHealth Group, Inc. 60%
Polk County5,08470.4%CVS Health Corporation 26%
Phelps County4,95550.1%UnitedHealth Group, Inc. 72%
Pettis County4,43746.8%UnitedHealth Group, Inc. 50%
Johnson County4,36344.5%UnitedHealth Group, Inc. 72%
Lafayette County4,21551.7%UnitedHealth Group, Inc. 50%
Scott County4,09041.1%UnitedHealth Group, Inc. 73%
Crawford County4,07164.6%UnitedHealth Group, Inc. 56%
Butler County4,03738.7%UnitedHealth Group, Inc. 66%
Benton County3,98252.8%UnitedHealth Group, Inc. 53%
Washington County3,92968.5%UnitedHealth Group, Inc. 45%
Wright County3,55265.6%UnitedHealth Group, Inc. 33%
Pulaski County3,49446.6%UnitedHealth Group, Inc. 49%
Henry County3,35650.6%UnitedHealth Group, Inc. 75%
Dallas County3,31371.5%UnitedHealth Group, Inc. 29%
Miller County3,30752.6%UnitedHealth Group, Inc. 52%
Stoddard County3,23442.0%UnitedHealth Group, Inc. 65%
Texas County3,20651.1%UnitedHealth Group, Inc. 62%
Morgan County3,20449.7%UnitedHealth Group, Inc. 45%
Dunklin County3,16646.3%UnitedHealth Group, Inc. 72%
Ste. Genevieve County2,92361.4%UnitedHealth Group, Inc. 79%
Ray County2,76149.9%Humana Inc. 39%
McDonald County2,73460.8%UnitedHealth Group, Inc. 31%
Gasconade County2,68159.9%UnitedHealth Group, Inc. 62%
Cedar County2,48759.5%UnitedHealth Group, Inc. 34%
Audrain County2,46542.0%UnitedHealth Group, Inc. 66%
Marion County2,45734.8%UnitedHealth Group, Inc. 84%
Vernon County2,39951.1%UnitedHealth Group, Inc. 47%
Randolph County2,34642.6%UnitedHealth Group, Inc. 72%
Saline County2,25744.9%UnitedHealth Group, Inc. 61%
Clinton County2,20341.3%UnitedHealth Group, Inc. 64%
Douglas County2,18157.4%Humana Inc. 28%
Bates County2,12452.5%UnitedHealth Group, Inc. 54%
Cooper County2,02248.2%UnitedHealth Group, Inc. 56%
Hickory County2,01658.8%UnitedHealth Group, Inc. 32%
Wayne County1,93053.3%UnitedHealth Group, Inc. 69%
Dent County1,91045.7%UnitedHealth Group, Inc. 72%
Madison County1,78150.3%UnitedHealth Group, Inc. 63%
Ozark County1,76954.4%Humana Inc. 42%
Pike County1,74741.0%UnitedHealth Group, Inc. 60%
Pemiscot County1,72448.6%UnitedHealth Group, Inc. 76%
Montgomery County1,72353.6%UnitedHealth Group, Inc. 58%
Moniteau County1,71553.4%UnitedHealth Group, Inc. 60%
New Madrid County1,63645.7%UnitedHealth Group, Inc. 76%
Osage County1,61653.8%UnitedHealth Group, Inc. 71%
Perry County1,57233.1%UnitedHealth Group, Inc. 58%
St. Clair County1,50751.6%UnitedHealth Group, Inc. 49%
Barton County1,48745.8%UnitedHealth Group, Inc. 32%
Oregon County1,46150.2%UnitedHealth Group, Inc. 43%
Iron County1,44552.0%UnitedHealth Group, Inc. 55%
Dade County1,41865.0%UnitedHealth Group, Inc. 27%
Macon County1,38031.9%UnitedHealth Group, Inc. 71%
Ripley County1,35839.6%UnitedHealth Group, Inc. 64%
Adair County1,35626.6%UnitedHealth Group, Inc. 72%
Bollinger County1,29142.7%UnitedHealth Group, Inc. 67%
Livingston County1,19332.4%UnitedHealth Group, Inc. 75%
Mississippi County1,17441.6%UnitedHealth Group, Inc. 79%
Andrew County1,17229.9%UnitedHealth Group, Inc. 73%
Shannon County1,16751.9%UnitedHealth Group, Inc. 44%
Howard County1,11944.4%UnitedHealth Group, Inc. 61%
Maries County1,10547.0%UnitedHealth Group, Inc. 56%
Linn County1,00030.5%UnitedHealth Group, Inc. 76%
Carroll County97641.0%UnitedHealth Group, Inc. 50%
Caldwell County95343.9%UnitedHealth Group, Inc. 72%
Ralls County94932.2%UnitedHealth Group, Inc. 85%
Nodaway County93621.3%UnitedHealth Group, Inc. 84%
Monroe County87135.3%UnitedHealth Group, Inc. 78%
Reynolds County83242.8%UnitedHealth Group, Inc. 57%
DeKalb County80233.9%UnitedHealth Group, Inc. 81%
Grundy County77330.9%UnitedHealth Group, Inc. 83%
Lewis County74630.9%UnitedHealth Group, Inc. 83%
Carter County72941.3%UnitedHealth Group, Inc. 57%
Daviess County66131.7%UnitedHealth Group, Inc. 84%
Harrison County60127.0%UnitedHealth Group, Inc. 82%
Chariton County57827.8%UnitedHealth Group, Inc. 81%
Shelby County45627.9%UnitedHealth Group, Inc. 84%
Sullivan County45330.0%UnitedHealth Group, Inc. 83%
Clark County40325.1%UnitedHealth Group, Inc. 89%
Gentry County39424.2%UnitedHealth Group, Inc. 85%
Putnam County35027.6%UnitedHealth Group, Inc. 82%
Holt County33127.0%UnitedHealth Group, Inc. 90%
Atchison County30821.1%UnitedHealth Group, Inc. 87%
Schuyler County29931.2%UnitedHealth Group, Inc. 86%
Mercer County28129.4%UnitedHealth Group, Inc. 95%
Knox County23223.0%UnitedHealth Group, Inc. 80%
Scotland County20320.5%UnitedHealth Group, Inc. 100%
Worth County16928.7%UnitedHealth Group, Inc. 100%