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Medicare Advantage Enrollment Tracker · Wisconsin

Medicare Advantage Enrollment in Wisconsin

Wisconsin had 791,183 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 1.1% from Sep 2025, slower than the national 2.0%. Wisconsin ranks 13th by members and holds 2.2% of the national total.

UnitedHealthcare leads with 35.2% of members who have a carrier label (contract file, September 2026). Among individual plans, which leave out employer group coverage, enrollment is up 1.3% 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.

Wisconsin at a glance

Medicare Advantage members

791,183

Wisconsin members by month: from 681K in Jan 2023 to 791K in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 13.

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

+1.1%

up 1.1 percent vs Sep 2025

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

Share of national total

2.2%

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

Individual plan members

696,335

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

35.2% of members with a carrier label. Contract file · Sep 2026.

Wisconsin members by month

Medicare Advantage members in Wisconsin

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 WisconsinLine chart, January 2023 to September 2026. Wisconsin: 791K in September 2026. Shaded bands mark months with no data.650K700K750K800K2023202420252026Wisconsin791K
Medicare Advantage members in WisconsinLine chart, January 2023 to September 2026. Wisconsin: 791K in September 2026. Shaded bands mark months with no data.650K700K750K800K20232025Wisconsin791K
  • Wisconsin
  • Shaded: no data that month
View the data table
Medicare Advantage members in Wisconsin: values by month
MonthWisconsin
Sep 2026791K
Aug 2026791K
Jul 2026790K
Jun 2026789K
May 2026788K
Apr 2026786K
Mar 2026785K
Feb 2026783K
Jan 2026774K
Dec 2025785K
Nov 2025785K
Oct 2025784K
Sep 2025783K
Aug 2025781K
Jul 2025779K
Jun 2025778K
May 2025776K
Apr 2025775K
Mar 2025773K
Feb 2025771K
Jan 2025763K
Dec 2024757K
Nov 2024757K
Oct 2024756K
Sep 2024754K
Aug 2024752K
Jul 2024750K
Jun 2024749K
May 2024746K
Apr 2024744K
Mar 2024742K
Feb 2024738K
Jan 2024736K
Dec 2023–
Nov 2023714K
Oct 2023712K
Sep 2023710K
Aug 2023707K
Jul 2023–
Jun 2023702K
May 2023699K
Apr 2023697K
Mar 2023694K
Feb 2023692K
Jan 2023681K

County file · Sep 2026. Employer group plans included.

Wisconsin 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.
Wisconsin and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Wisconsin: 116.2 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001051101151202023202420252026National117.8Wisconsin116.2
Wisconsin and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Wisconsin: 116.2 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10010511011512020232025National117.8Wisconsin116.2
  • Wisconsin
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
Wisconsin and the nation, Jan 2023 = 100: values by month
MonthWisconsinNational (same jurisdictions each month)
Sep 2026116.2117.8
Aug 2026116.1117.8
Jul 2026116117.5
Jun 2026115.8117.4
May 2026115.7117.2
Apr 2026115.5116.9
Mar 2026115.3116.7
Feb 2026115116.3
Jan 2026113.6114.7
Dec 2025115.3115.9
Nov 2025115.3115.9
Oct 2025115.2115.7
Sep 2025114.9115.5
Aug 2025114.7115.3
Jul 2025114.4115
Jun 2025114.2114.8
May 2025113.9114.4
Apr 2025113.8114.2
Mar 2025113.6113.8
Feb 2025113.3113.4
Jan 2025112.1111.9
Dec 2024111.2112
Nov 2024111.2112
Oct 2024111111.7
Sep 2024110.8111.5
Aug 2024110.5111.2
Jul 2024110.1110.9
Jun 2024109.9110.7
May 2024109.6110.5
Apr 2024109.2110
Mar 2024108.9109.7
Feb 2024108.4109.3
Jan 2024108108.7
Dec 2023––
Nov 2023104.9105.9
Oct 2023104.6105.6
Sep 2023104.2105.2
Aug 2023103.8104.9
Jul 2023––
Jun 2023103.1104.1
May 2023102.7103.8
Apr 2023102.3103.4
Mar 2023101.9103
Feb 2023101.6102.2
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 Wisconsin

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 35.2% of members who have a carrier label (contract file, September 2026).

UnitedHealthcare lost 5.2 points in 12 months; most of that change came in January 2026.

Network Health gained 5.8 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 50.5%, down 1.8 points from 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: 40.4% to 35.2%; Network Health: 11.0% to 16.8%; Humana: 11.8% to 15.2%; Marshfield Clinic Health System: 9.1% to 10.1%; Medica: 5.7% to 6.2%; Aetna/CVS: 4.0% to 4.8%.Sep 2025Sep 2026UnitedHealthcare 40.4%35.2% UnitedHealthcareNetwork Health 11.0%16.8% Network HealthHumana 11.8%15.2% HumanaMarshfield 9.1%10.1% MarshfieldMedica 5.7%6.2% MedicaAetna/CVS 4.0%4.8% Aetna/CVS
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 40.4% to 35.2%; Network Health: 11.0% to 16.8%; Humana: 11.8% to 15.2%; Marshfield Clinic Health System: 9.1% to 10.1%; Medica: 5.7% to 6.2%; Aetna/CVS: 4.0% to 4.8%.Sep 2025Sep 2026UHC 40.4%35.2%Network 11.0%16.8%Humana 11.8%15.2%Marshfield 9.1%10.1%Medica 5.7%6.2%Aetna 4.0%4.8%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
UnitedHealthcare40.4%35.2%−5.2 pts
Network Health11.0%16.8%+5.8 pts
Humana11.8%15.2%+3.5 pts
Marshfield Clinic Health System9.1%10.1%+1.0 pts
Medica5.7%6.2%+0.5 pts
Aetna/CVS4.0%4.8%+0.8 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, Wisconsin, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
UnitedHealthcare35.2%40.4%−5.2 pts277,667
Network Health16.8%11.0%+5.8 pts132,475
Humana15.2%11.8%+3.5 pts120,211
Marshfield Clinic Health System10.1%9.1%+1.0 pts79,296
Medica6.2%5.7%+0.5 pts48,506
Aetna/CVS4.8%4.0%+0.8 pts37,768
Elevance/Anthem4.8%10.3%−5.6 pts37,496
University of Wisconsin Hospitals and Clincs Autho2.4%4.1%−1.7 pts18,677
All other carriers2.0%––15,839
Centene/Wellcare1.6%1.1%+0.5 pts12,762
HealthPartners1.0%1.1%−0.1 pts7,806

Insurer not assigned in CMS data: 0.1% of all members in Sep 2026, 0.2% in Sep 2025. Shares leave these members out. 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 Wisconsin

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 Wisconsin by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
Milwaukee95,862+1.3%UnitedHealthcare55.7%
Waukesha53,846+3.2%UnitedHealthcare57.5%
Brown37,775+3.2%Network Health41.1%
Dane32,445+0.8%Medica29.9%
Outagamie29,433+3.9%Network Health56.8%
Winnebago26,095+2.4%Network Health53.3%
Racine24,691+3.4%UnitedHealthcare51.8%
Marathon19,921+1.2%Marshfield Clinic Health System59.9%
Washington19,823+4.5%UnitedHealthcare53.3%
Sheboygan16,562+2.4%UnitedHealthcare39.1%

Browse all counties.

Common questions

How many people have Medicare Advantage in Wisconsin?

Wisconsin had 791,183 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 696,335 members in September 2026.

Is Medicare Advantage growing in Wisconsin?

Enrollment is up 1.1% from Sep 2025 to Sep 2026, slower than the national 2.0%. Among individual plans, which leave out employer group coverage, enrollment is up 1.3% in the 12 months to September 2026.

Which carrier has the most Medicare Advantage members in Wisconsin?

UnitedHealthcare leads with 35.2% of members who have a carrier label (contract file, September 2026). UnitedHealthcare and Humana together hold 50.5%, down 1.8 points from Sep 2025. Shares leave out members whose contract has no carrier label: 0.1% of members.

Cite and download

Cite this page

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

Download Wisconsin 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