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MA Enrollment Explorer / States / Ohio

Medicare Advantage in Ohio: enrollment, penetration and market share

1,501,980 people in Ohio were enrolled in Medicare Advantage in October 2026. 56.7% of the state's 2,647,377 eligible Medicare beneficiaries are in Medicare Advantage, −0.5 pts since October 2025. UnitedHealth Group, Inc. is the largest parent organization with 23% of reported enrollment; 27 parent organizations have 11 or more members, and the market's HHI is 1,544 (moderately concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Ohio changed by +6,948 (+0.5%).

56.7%MA penetration, October 2026
1.50MMA enrollees
27parent organizations (11+ members)
1,544HHI, moderately concentrated
Open Ohio on the market mapMSSP ACOs in Ohio

Parent organizations in Ohio

Parent organizationMembersChangeShareShare change
UnitedHealth Group, Inc.343,789−4,49423.0%−0.7 pts
CVS Health Corporation328,179+37,02821.9%+2.1 pts
Elevance Health, Inc.228,633−98,64315.3%−7.0 pts
Humana Inc.220,510+22,91114.7%+1.3 pts
MEDICAL MUTUAL OF OHIO87,333−14,2765.8%−1.1 pts
Devoted Health, Inc.66,757+31,4504.5%+2.1 pts
Trinity Health Corporation55,799+14,8593.7%+0.9 pts
CareSource38,483+17,1112.6%+1.1 pts
General Catalyst Group Management Holdings LP34,503+8,0332.3%+0.5 pts
Health Care Service Corporation18,846+10,3891.3%+0.7 pts
Centene Corporation15,693−6,6681.0%−0.5 pts
Molina Healthcare, Inc.15,372+3,4991.0%+0.2 pts
Aultman Health Foundation14,414+1161.0%−0.01 pts
Highmark Health7,841+1,5740.5%+0.1 pts
The Health Plan of West Virginia, Inc.6,164+1,8200.4%+0.1 pts
UMWA Health and Retirement Funds2,967−1200.2%−0.01 pts
Zing Health Consolidator, Inc2,540+1,4690.2%+0.1 pts
The Schroer Group, Inc.2,341+3760.2%+0.02 pts
Blue Cross Blue Shield of Michigan Mutual Ins. Co.2,339−370.2%−0.01 pts
Perennial Consortium, LLC1,548+8670.1%+0.1 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
Cuyahoga County163,84357.9%UnitedHealth Group, Inc. 27%
Franklin County119,20356.2%CVS Health Corporation 29%
Hamilton County93,87156.8%UnitedHealth Group, Inc. 25%
Summit County81,59363.0%UnitedHealth Group, Inc. 23%
Montgomery County74,02261.3%UnitedHealth Group, Inc. 29%
Stark County65,22669.0%UnitedHealth Group, Inc. 21%
Lucas County55,40158.1%CVS Health Corporation 25%
Lorain County46,14358.0%UnitedHealth Group, Inc. 25%
Butler County43,50655.5%UnitedHealth Group, Inc. 26%
Mahoning County39,62864.7%UnitedHealth Group, Inc. 30%
Trumbull County34,20962.8%UnitedHealth Group, Inc. 26%
Lake County34,12055.2%UnitedHealth Group, Inc. 22%
Clermont County28,77159.0%Humana Inc. 25%
Warren County25,85952.6%UnitedHealth Group, Inc. 24%
Medina County25,32255.9%UnitedHealth Group, Inc. 20%
Portage County24,14764.1%UnitedHealth Group, Inc. 22%
Licking County22,69455.7%CVS Health Corporation 28%
Delaware County20,76447.5%CVS Health Corporation 40%
Clark County19,69160.7%UnitedHealth Group, Inc. 36%
Fairfield County19,63057.9%CVS Health Corporation 27%
Greene County18,67349.7%UnitedHealth Group, Inc. 28%
Richland County16,67954.1%UnitedHealth Group, Inc. 31%
Columbiana County16,67761.6%UnitedHealth Group, Inc. 25%
Wayne County14,86956.5%UnitedHealth Group, Inc. 17%
Wood County14,67852.0%CVS Health Corporation 34%
Tuscarawas County14,48964.3%Elevance Health, Inc. 27%
Miami County14,48554.8%Elevance Health, Inc. 29%
Ashtabula County13,98154.6%UnitedHealth Group, Inc. 39%
Muskingum County12,75958.1%CVS Health Corporation 51%
Allen County12,16350.7%UnitedHealth Group, Inc. 25%
Geauga County12,01748.6%UnitedHealth Group, Inc. 21%
Erie County10,73651.3%UnitedHealth Group, Inc. 30%
Ross County10,05556.5%Trinity Health Corporation 25%
Belmont County10,01757.7%CVS Health Corporation 29%
Jefferson County9,16253.4%CVS Health Corporation 37%
Marion County9,00859.2%CVS Health Corporation 27%
Scioto County8,89351.8%Humana Inc. 31%
Knox County8,29655.1%Humana Inc. 32%
Hancock County7,94346.4%CVS Health Corporation 54%
Washington County7,48546.6%Humana Inc. 25%
Ashland County7,41657.3%CVS Health Corporation 22%
Lawrence County7,39950.3%Humana Inc. 30%
Pickaway County7,34958.4%Trinity Health Corporation 22%
Sandusky County7,34947.8%CVS Health Corporation 27%
Huron County7,25651.8%UnitedHealth Group, Inc. 23%
Ottawa County6,87252.1%MEDICAL MUTUAL OF OHIO 26%
Brown County6,72361.9%Humana Inc. 23%
Athens County6,07252.8%CVS Health Corporation 35%
Union County5,96250.8%CVS Health Corporation 35%
Highland County5,91457.4%UnitedHealth Group, Inc. 26%
Preble County5,78956.1%UnitedHealth Group, Inc. 33%
Clinton County5,77056.6%Elevance Health, Inc. 27%
Seneca County5,76542.6%CVS Health Corporation 44%
Crawford County5,74750.7%CVS Health Corporation 34%
Madison County5,68559.6%CVS Health Corporation 26%
Darke County5,51142.9%UnitedHealth Group, Inc. 34%
Logan County5,44547.4%CVS Health Corporation 31%
Guernsey County5,40755.2%CVS Health Corporation 49%
Fulton County5,32251.4%CVS Health Corporation 29%
Champaign County5,19257.0%UnitedHealth Group, Inc. 33%
Defiance County5,01751.5%CVS Health Corporation 40%
Perry County4,98558.0%Trinity Health Corporation 24%
Coshocton County4,80453.0%UnitedHealth Group, Inc. 35%
Carroll County4,64562.9%CVS Health Corporation 23%
Morrow County4,43653.2%Humana Inc. 29%
Williams County4,36046.1%CVS Health Corporation 40%
Auglaize County4,33739.5%CVS Health Corporation 33%
Jackson County4,29954.1%Humana Inc. 27%
Adams County4,20860.6%Elevance Health, Inc. 28%
Shelby County4,08838.2%CVS Health Corporation 30%
Gallia County4,02454.0%Humana Inc. 28%
Hocking County3,80754.0%Elevance Health, Inc. 20%
Fayette County3,68653.8%UnitedHealth Group, Inc. 24%
Pike County3,55151.1%UnitedHealth Group, Inc. 28%
Meigs County3,41957.1%CVS Health Corporation 28%
Hardin County3,33151.3%CVS Health Corporation 32%
Van Wert County3,30446.9%CVS Health Corporation 35%
Mercer County3,21532.2%CVS Health Corporation 45%
Henry County3,11945.7%CVS Health Corporation 48%
Putnam County3,08537.7%CVS Health Corporation 32%
Holmes County2,94151.5%CVS Health Corporation 24%
Wyandot County2,56845.3%CVS Health Corporation 44%
Harrison County2,31558.3%CVS Health Corporation 35%
Paulding County2,24849.5%CVS Health Corporation 30%
Monroe County2,22855.2%Humana Inc. 21%
Morgan County2,16361.3%CVS Health Corporation 38%
Vinton County1,64758.7%Humana Inc. 23%
Noble County1,49750.0%CVS Health Corporation 40%