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Medicare Advantage Enrollment Tracker · Ohio

Medicare Advantage Enrollment in Ohio

Ohio had 1,498,192 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 1.9% from Sep 2025, close to the national 2.0%. Ohio ranks 6th by members and holds 4.2% of the national total.

UnitedHealthcare leads with 23.1% of members who have a carrier label (contract file, September 2026). Among individual plans, which leave out employer group coverage, enrollment is up 2.7% in the 12 months to September 2026.

By Senior Deal Club Standards Desk · Data as of September 2026 · Editorial policy

Data as ofCMS public files, monthly snapshot

  • These totals include employer and union group plans.
    Why this matters

    The CMS contract and county files count group plans that retirees get through a former employer. They are not plans you can pick on your own. Counts here are larger than the individual-plan counts on county pages.

  • Some months are missing from the source.
    Why this matters

    CMS did not publish every month. Lines break at a missing month instead of guessing a value. A dotted line, where shown, only joins the two sides.

Ohio at a glance

Medicare Advantage members

1,498,192

Ohio members by month: from 1.31M in Jan 2023 to 1.5M in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 6.

County file · Sep 2026
CMS state, county and plan-type file (SCP). The same plans split by state and county, with employer and union group plans included. CMS hides counts of 10 or fewer.

12-month change

+1.9%

up 1.9 percent vs Sep 2025

County file · Sep 2026. National: +2.0%.

Share of national total

4.2%

County file · Sep 2026. Of jurisdictions that report every month.

Individual plan members

1,219,306

Individual MA · Sep 2026. Employer group plans left out.

Individual MA · Sep 2026
Individual Medicare Advantage plans (IND), from county data. Employer and union group plans are left out, so counts are smaller than in the other two files.

Largest carrier

UnitedHealthcare

23.1% of members with a carrier label. Contract file · Sep 2026.

Ohio members by month

Medicare Advantage members in Ohio

Members, by month.

County file · Sep 2026
CMS state, county and plan-type file (SCP). The same plans split by state and county, with employer and union group plans included. CMS hides counts of 10 or fewer.
Medicare Advantage members in OhioLine chart, January 2023 to September 2026. Ohio: 1.5M in September 2026. Shaded bands mark months with no data.1.3M1.35M1.4M1.45M1.5M2023202420252026Ohio1.5M
Medicare Advantage members in OhioLine chart, January 2023 to September 2026. Ohio: 1.5M in September 2026. Shaded bands mark months with no data.1.3M1.35M1.4M1.45M1.5M20232025Ohio1.5M
  • Ohio
  • Shaded: no data that month
View the data table
Medicare Advantage members in Ohio: values by month
MonthOhio
Sep 20261.5M
Aug 20261.5M
Jul 20261.49M
Jun 20261.49M
May 20261.49M
Apr 20261.49M
Mar 20261.48M
Feb 20261.48M
Jan 20261.46M
Dec 20251.47M
Nov 20251.47M
Oct 20251.47M
Sep 20251.47M
Aug 20251.47M
Jul 20251.47M
Jun 20251.47M
May 20251.47M
Apr 20251.46M
Mar 20251.46M
Feb 20251.46M
Jan 20251.45M
Dec 20241.43M
Nov 20241.43M
Oct 20241.43M
Sep 20241.42M
Aug 20241.42M
Jul 20241.42M
Jun 20241.41M
May 20241.41M
Apr 20241.41M
Mar 20241.41M
Feb 20241.4M
Jan 20241.4M
Dec 2023–
Nov 20231.36M
Oct 20231.36M
Sep 20231.35M
Aug 20231.35M
Jul 2023–
Jun 20231.34M
May 20231.34M
Apr 20231.34M
Mar 20231.33M
Feb 20231.33M
Jan 20231.31M

County file · Sep 2026. Employer group plans included.

Ohio and the nation, Jan 2023 = 100

Each line is members divided by members in the start month, times 100.

County file · Sep 2026
CMS state, county and plan-type file (SCP). The same plans split by state and county, with employer and union group plans included. CMS hides counts of 10 or fewer.
Ohio and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Ohio: 114.1 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001051101151202023202420252026National117.8Ohio114.1
Ohio and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Ohio: 114.1 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10010511011512020232025National117.8Ohio114.1
  • Ohio
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
Ohio and the nation, Jan 2023 = 100: values by month
MonthOhioNational (same jurisdictions each month)
Sep 2026114.1117.8
Aug 2026114117.8
Jul 2026113.7117.5
Jun 2026113.5117.4
May 2026113.3117.2
Apr 2026113.2116.9
Mar 2026113116.7
Feb 2026112.7116.3
Jan 2026111.6114.7
Dec 2025112.2115.9
Nov 2025112.3115.9
Oct 2025112.3115.7
Sep 2025112115.5
Aug 2025112.2115.3
Jul 2025112115
Jun 2025111.8114.8
May 2025111.6114.4
Apr 2025111.5114.2
Mar 2025111.4113.8
Feb 2025111.2113.4
Jan 2025110.3111.9
Dec 2024108.7112
Nov 2024108.8112
Oct 2024108.7111.7
Sep 2024108.4111.5
Aug 2024108.3111.2
Jul 2024108110.9
Jun 2024107.7110.7
May 2024107.5110.5
Apr 2024107.3110
Mar 2024107.1109.7
Feb 2024106.8109.3
Jan 2024106.4108.7
Dec 2023––
Nov 2023103.7105.9
Oct 2023103.4105.6
Sep 2023103.1105.2
Aug 2023102.9104.9
Jul 2023––
Jun 2023102.4104.1
May 2023102.1103.8
Apr 2023101.9103.4
Mar 2023101.6103
Feb 2023101.3102.2
Jan 2023100100

County file · Sep 2026. National line sums the jurisdictions that report in every month.

Individual plans

Individual plans leave out employer and union group coverage, so counts are smaller than in the county file.

Carrier share in Ohio

Share of members whose contract has a carrier label, September 2026 against September 2025.

Contract file · Sep 2026
CMS contract file (SCC). All Medicare Advantage contracts, with employer and union group plans included. It still lists Connecticut and Alaska.

UnitedHealthcare leads with 23.1% of members who have a carrier label (contract file, September 2026).

Aetna/CVS gained 2.1 points in 12 months; most of that change came in January 2026.

Elevance/Anthem lost 7.9 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 38.0%, about the same as in Sep 2025.

The market is less concentrated than a year earlier (direction only; the level depends on how carriers are grouped).

Carrier share, Sep 2025 to Sep 2026

Percent of members with a carrier label. Largest carriers.

Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 24.1% to 23.1%; Aetna/CVS: 19.8% to 21.9%; Elevance/Anthem: 23.3% to 15.4%; Humana: 14.0% to 14.9%; MEDICAL MUTUAL OF OHIO: 7.2% to 5.9%; Devoted Health: 2.5% to 4.5%.Sep 2025Sep 2026UnitedHealthcare 24.1%23.1% UnitedHealthcareAetna/CVS 19.8%21.9% Aetna/CVSElevance/Anthem 23.3%15.4% Elevance/AnthemHumana 14.0%14.9% HumanaMEDICAL 7.2%5.9% MEDICALDevoted Health 2.5%4.5% Devoted Health
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 24.1% to 23.1%; Aetna/CVS: 19.8% to 21.9%; Elevance/Anthem: 23.3% to 15.4%; Humana: 14.0% to 14.9%; MEDICAL MUTUAL OF OHIO: 7.2% to 5.9%; Devoted Health: 2.5% to 4.5%.Sep 2025Sep 2026UHC 24.1%23.1%Aetna 19.8%21.9%Elevance 23.3%15.4%Humana 14.0%14.9%MEDICAL 7.2%5.9%Devoted 2.5%4.5%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
UnitedHealthcare24.1%23.1%−1.0 pts
Aetna/CVS19.8%21.9%+2.1 pts
Elevance/Anthem23.3%15.4%−7.9 pts
Humana14.0%14.9%+0.9 pts
MEDICAL MUTUAL OF OHIO7.2%5.9%−1.3 pts
Devoted Health2.5%4.5%+1.9 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, Ohio, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
UnitedHealthcare23.1%24.1%−1.0 pts343,576
Aetna/CVS21.9%19.8%+2.1 pts326,725
Elevance/Anthem15.4%23.3%−7.9 pts229,192
Humana14.9%14.0%+0.9 pts222,016
MEDICAL MUTUAL OF OHIO5.9%7.2%−1.3 pts87,281
Devoted Health4.5%2.5%+1.9 pts66,308
Trinity Health Corporation3.7%2.9%+0.8 pts55,825
CareSource2.4%0.6%+1.9 pts36,121
Summa Health2.3%1.9%+0.5 pts34,546
All other carriers1.6%––24,190
HCSC/BCBS1.3%0.6%+0.7 pts18,716
Centene/Wellcare1.1%0.8%+0.2 pts15,986
Molina1.0%0.1%+0.9 pts15,050
Aultman Health Foundation1.0%1.0%0.0 pts14,429

Insurer not assigned in CMS data: 0.3% of all members in Sep 2026, 3.8% in Sep 2025. Shares leave these members out. The unassigned share is above 3%, so treat share changes as rough. Contract IDs are renumbered each January, so this page follows carriers, not contracts. A contract that serves several states carries one carrier label, so a carrier can appear in a state where it is not a local plan. See the carrier view for the whole nation.

Biggest counties in Ohio

Individual plan members and the 12-month change for each county, from county data.

Individual MA · Sep 2026
Individual Medicare Advantage plans (IND), from county data. Employer and union group plans are left out, so counts are smaller than in the other two files.
Biggest counties in Ohio by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
Cuyahoga138,067+1.4%UnitedHealthcare26.9%
Franklin99,510+1.3%Humana23.8%
Hamilton76,965+1.2%Humana28.1%
Summit68,800+1.8%UnitedHealthcare23.4%
Montgomery65,189+1.8%Elevance/Anthem30.9%
Stark55,480+2.4%UnitedHealthcare22.6%
Lucas43,838+2.0%MEDICAL MUTUAL OF OHIO26.6%
Butler35,980+2.7%UnitedHealthcare24.4%
Lorain34,164+4.5%UnitedHealthcare20.3%
Mahoning32,724+0.6%UnitedHealthcare27.2%

Browse all counties.

Common questions

How many people have Medicare Advantage in Ohio?

Ohio had 1,498,192 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 1,219,306 members in September 2026.

Is Medicare Advantage growing in Ohio?

Enrollment is up 1.9% from Sep 2025 to Sep 2026, close to the national 2.0%. Among individual plans, which leave out employer group coverage, enrollment is up 2.7% in the 12 months to September 2026.

Which carrier has the most Medicare Advantage members in Ohio?

UnitedHealthcare leads with 23.1% of members who have a carrier label (contract file, September 2026). UnitedHealthcare and Humana together hold 38.0%, about the same as in Sep 2025. Shares leave out members whose contract has no carrier label: 0.3% of members.

Cite and download

Cite this page

Senior Deal Club Standards Desk. Medicare Advantage Enrollment in Ohio, data as of September 2026. Source: CMS public enrollment files. https://www.seniordealclub.com/medicare-advantage/enrollment/states/ohio

Download Ohio CSV

Data: CMS public enrollment files, in a monthly snapshot processed by TapQuality. Senior Deal Club is not affiliated with Medicare or any government agency.

These pages are educational. They are not plan advice. How the numbers are built · Editorial policy