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Medicare Advantage Enrollment Tracker · Michigan

Medicare Advantage Enrollment in Michigan

Michigan had 1,483,391 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 2.3% from Sep 2025, close to the national 2.0%. Michigan ranks 7th by members and holds 4.1% of the national total.

BCBS Michigan leads with 36.5% of members who have a carrier label (contract file, September 2026). Among individual plans, which leave out employer group coverage, enrollment is up 3.9% 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.

Michigan at a glance

Medicare Advantage members

1,483,391

Michigan members by month: from 1.25M in Jan 2023 to 1.48M in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 7.

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

+2.3%

up 2.3 percent vs Sep 2025

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

Share of national total

4.1%

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

Individual plan members

972,219

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

BCBS Michigan

36.5% of members with a carrier label. Contract file · Sep 2026.

Michigan members by month

Medicare Advantage members in Michigan

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 MichiganLine chart, January 2023 to September 2026. Michigan: 1.48M in September 2026. Shaded bands mark months with no data.1.2M1.3M1.4M1.5M2023202420252026Michigan1.48M
Medicare Advantage members in MichiganLine chart, January 2023 to September 2026. Michigan: 1.48M in September 2026. Shaded bands mark months with no data.1.2M1.3M1.4M1.5M20232025Michigan1.48M
  • Michigan
  • Shaded: no data that month
View the data table
Medicare Advantage members in Michigan: values by month
MonthMichigan
Sep 20261.48M
Aug 20261.48M
Jul 20261.48M
Jun 20261.48M
May 20261.48M
Apr 20261.48M
Mar 20261.47M
Feb 20261.47M
Jan 20261.45M
Dec 20251.45M
Nov 20251.45M
Oct 20251.45M
Sep 20251.45M
Aug 20251.45M
Jul 20251.45M
Jun 20251.44M
May 20251.44M
Apr 20251.44M
Mar 20251.44M
Feb 20251.44M
Jan 20251.42M
Dec 20241.4M
Nov 20241.4M
Oct 20241.4M
Sep 20241.4M
Aug 20241.39M
Jul 20241.39M
Jun 20241.39M
May 20241.38M
Apr 20241.38M
Mar 20241.38M
Feb 20241.37M
Jan 20241.36M
Dec 2023–
Nov 20231.32M
Oct 20231.31M
Sep 20231.31M
Aug 20231.31M
Jul 2023–
Jun 20231.3M
May 20231.29M
Apr 20231.29M
Mar 20231.28M
Feb 20231.28M
Jan 20231.25M

County file · Sep 2026. Employer group plans included.

Michigan 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.
Michigan and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Michigan: 118.2 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001051101151202023202420252026Michigan118.2National117.8
Michigan and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Michigan: 118.2 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10010511011512020232025Michigan118.2National117.8
  • Michigan
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
Michigan and the nation, Jan 2023 = 100: values by month
MonthMichiganNational (same jurisdictions each month)
Sep 2026118.2117.8
Aug 2026118.2117.8
Jul 2026118.1117.5
Jun 2026117.9117.4
May 2026117.8117.2
Apr 2026117.6116.9
Mar 2026117.4116.7
Feb 2026117.1116.3
Jan 2026115.6114.7
Dec 2025115.8115.9
Nov 2025115.8115.9
Oct 2025115.7115.7
Sep 2025115.6115.5
Aug 2025115.5115.3
Jul 2025115.2115
Jun 2025115.1114.8
May 2025114.8114.4
Apr 2025114.6114.2
Mar 2025114.6113.8
Feb 2025114.4113.4
Jan 2025113.6111.9
Dec 2024111.7112
Nov 2024111.7112
Oct 2024111.6111.7
Sep 2024111.2111.5
Aug 2024111.1111.2
Jul 2024110.9110.9
Jun 2024110.6110.7
May 2024110.3110.5
Apr 2024110110
Mar 2024109.8109.7
Feb 2024109.5109.3
Jan 2024108.6108.7
Dec 2023––
Nov 2023105105.9
Oct 2023104.7105.6
Sep 2023104.4105.2
Aug 2023104.1104.9
Jul 2023––
Jun 2023103.4104.1
May 2023103103.8
Apr 2023102.7103.4
Mar 2023102.3103
Feb 2023102102.2
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 Michigan

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.

BCBS Michigan leads with 36.5% of members who have a carrier label (contract file, September 2026).

BCBS Michigan lost 6.9 points in 12 months; most of that change came in January 2026.

Humana gained 2.4 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 22.3%, up 1.2 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. BCBS Michigan: 43.4% to 36.5%; Corewell Health: 18.1% to 19.4%; Humana: 14.6% to 17.0%; Henry Ford Health System: 6.2% to 9.0%; Aetna/CVS: 6.7% to 7.1%; UnitedHealthcare: 6.6% to 5.4%.Sep 2025Sep 2026BCBS Michigan 43.4%36.5% BCBS MichiganCorewell Health 18.1%19.4% Corewell HealthHumana 14.6%17.0% HumanaHenry 6.2%9.0% HenryAetna/CVS 6.7%7.1% Aetna/CVSUnitedHealthcare 6.6%5.4% UnitedHealthcare
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. BCBS Michigan: 43.4% to 36.5%; Corewell Health: 18.1% to 19.4%; Humana: 14.6% to 17.0%; Henry Ford Health System: 6.2% to 9.0%; Aetna/CVS: 6.7% to 7.1%; UnitedHealthcare: 6.6% to 5.4%.Sep 2025Sep 2026Blue Cross 43.4%36.5%Corewell 18.1%19.4%Humana 14.6%17.0%Henry 6.2%9.0%Aetna 6.7%7.1%UHC 6.6%5.4%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
BCBS Michigan43.4%36.5%−6.9 pts
Corewell Health18.1%19.4%+1.3 pts
Humana14.6%17.0%+2.4 pts
Henry Ford Health System6.2%9.0%+2.9 pts
Aetna/CVS6.7%7.1%+0.3 pts
UnitedHealthcare6.6%5.4%−1.2 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, Michigan, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
BCBS Michigan36.5%43.4%−6.9 pts537,308
Corewell Health19.4%18.1%+1.3 pts285,544
Humana17.0%14.6%+2.4 pts249,907
Henry Ford Health System9.0%6.2%+2.9 pts132,952
Aetna/CVS7.1%6.7%+0.3 pts104,041
UnitedHealthcare5.4%6.6%−1.2 pts79,154
Centene/Wellcare2.1%2.0%+0.1 pts30,561
All other carriers1.1%––15,991
Molina1.0%0.7%+0.3 pts15,255
Zing Health0.8%0.6%+0.2 pts11,902
Trinity Health Corporation0.7%0.4%+0.3 pts10,936

Insurer not assigned in CMS data: 0.5% of all members in Sep 2026, 3.2% 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 Michigan

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 Michigan by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
Wayne159,353+2.3%Humana23.7%
Oakland100,929+4.9%BCBS Michigan25.5%
Macomb81,212+4.4%Humana22.9%
Kent74,307+3.9%Corewell Health68.7%
Ottawa38,928+4.3%Corewell Health74.6%
Genesee37,930+5.7%Humana22.1%
Muskegon26,336+4.4%Corewell Health42.8%
Kalamazoo24,770+2.3%Corewell Health49.1%
Saginaw20,040+5.2%Humana28.3%
Washtenaw19,916+4.6%BCBS Michigan28.6%

Browse all counties.

Common questions

How many people have Medicare Advantage in Michigan?

Michigan had 1,483,391 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 972,219 members in September 2026.

Is Medicare Advantage growing in Michigan?

Enrollment is up 2.3% from Sep 2025 to Sep 2026, close to the national 2.0%. Among individual plans, which leave out employer group coverage, enrollment is up 3.9% in the 12 months to September 2026.

Which carrier has the most Medicare Advantage members in Michigan?

BCBS Michigan leads with 36.5% of members who have a carrier label (contract file, September 2026). UnitedHealthcare and Humana together hold 22.3%, up 1.2 points from Sep 2025. Shares leave out members whose contract has no carrier label: 0.5% of members.

Cite and download

Cite this page

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

Download Michigan 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