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Medicare Advantage Enrollment Tracker

BCBS Michigan Medicare Advantage Enrollment

In September 2026, BCBS Michigan had 669,751 Medicare Advantage members, down 84,853 from September 2025. That is 1.9% of members with a carrier label, eighth among carriers. Its share edged down 0.3 points since September 2025.

Data as ofCMS contract file

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

    Carrier shares: all Medicare Advantage contracts, including employer group, from the CMS contract file. Share is of members with a carrier label. This file and the state file give different totals, so these shares do not apply to state or county member counts.

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

    Missing months: July 2023 and December 2023 are absent from the state and county file; July 2023 is absent from the contract file. Lines break at a gap. Nothing is filled or averaged across it. Year-over-year changes compare the same calendar month, so July 2023 and December 2023 cannot be compared.

  • Some contracts have no carrier name.
    Why this matters

    Insurer not assigned in CMS data: 0.6% of members in September 2026 (225,918), against 10.7% in January 2023. These are mostly retired contracts with no carrier label. Shares divide by members with a label so old and new months compare. When the unassigned bucket is above 3% in either month, treat share changes as rough.

  • Shares jump each January. Compare same months.
    Why this matters

    Counts and shares step at each January, when plan-year contracts and annual elections take effect. A 12-month change is mostly one January step plus drift. CMS posts January counts late, so compare November with February or March, not January alone.

By Senior Deal Club Standards Desk. Editorial policy. Methodology. Senior Deal Club is not affiliated with Medicare or any government agency. This page is educational. It counts members. It does not rate plans.

BCBS Michigan led 1 area and held 20% or more in 1 more. An area is a state or DC.

Shares are of members whose contract has a carrier label, from the CMS contract file. The file includes employer group plans. Source: CMS, September 2026.

BCBS Michigan at a glance

Share of labelled members

1.9%

down 0.3 percentage points vs September 2025

September 2026, rank 8 among carriers

Members

669,751

September 2026, contract file

States led

1

Areas where BCBS Michigan had the most labelled members, September 2026

National share against nearby carriers

BCBS Michigan and the carriers ranked just above and below it, January 2023 to September 2026.

BCBS Michigan share of members

Percent of members with a carrier label, monthly

Contract file · September 2026
CMS contract file. Includes employer group plans. Share divides by members with a carrier label.
BCBS Michigan share of membersLine chart, January 2023 to September 2026. BCBS Michigan: 1.9% in September 2026. HCSC/BCBS: 2.5% in September 2026. Devoted Health: 1.5% in September 2026. Centene/Wellcare: 2.5% in September 2026. Shaded bands mark months with no data.0%1%2%3%4%5%2023202420252026ABCentene/Wellcare2.5%HCSC/BCBS2.5%BCBS Michigan1.9%Devoted Health1.5%
BCBS Michigan share of membersLine chart, January 2023 to September 2026. BCBS Michigan: 1.9% in September 2026. HCSC/BCBS: 2.5% in September 2026. Devoted Health: 1.5% in September 2026. Centene/Wellcare: 2.5% in September 2026. Shaded bands mark months with no data.0%1%2%3%4%5%20232025ABCentene2.5%Blue Cross2.5%Blue Cross1.9%Devoted1.5%
  • BCBS Michigan
  • HCSC/BCBS
  • Devoted Health
  • Centene/Wellcare
  • Shaded: no data that month
  1. Note A: July 2023: No contract-file data for July 2023.
  2. Note B: January 2026: January step: plan-year contract changes move members between carriers. Shares jump in this month.
View the data table
BCBS Michigan share of members: values by month
MonthBCBS MichiganHCSC/BCBSDevoted HealthCentene/Wellcare
Sep 20261.9%2.5%1.5%2.5%
Aug 20261.9%2.5%1.5%2.6%
Jul 20261.9%2.5%1.5%2.6%
Jun 20261.9%2.5%1.4%2.6%
May 20261.9%2.5%1.4%2.6%
Apr 20261.9%2.5%1.4%2.7%
Mar 20261.9%2.4%1.3%2.7%
Feb 20261.9%2.5%1.3%2.7%
Jan 20261.9%2.4%1.3%2.7%
Dec 20252.2%2.7%0.6%2.7%
Nov 20252.2%2.7%0.6%2.7%
Oct 20252.2%2.7%0.6%2.7%
Sep 20252.2%2.7%0.6%2.8%
Aug 20252.2%2.7%0.6%2.8%
Jul 20252.2%2.6%0.6%2.8%
Jun 20252.2%2.6%0.6%2.8%
May 20252.2%2.6%0.6%2.8%
Apr 20252.2%2.6%0.6%2.9%
Mar 20252.2%2.6%0.6%2.9%
Feb 20252.2%2.6%0.6%2.9%
Jan 20252.2%2.5%0.7%2.9%
Dec 20242.1%2.4%0.8%3.0%
Nov 20242.1%2.3%0.8%3.0%
Oct 20242.1%2.4%0.7%3.1%
Sep 20242.1%2.4%0.7%3.1%
Aug 20242.2%2.4%0.7%3.1%
Jul 20242.2%2.4%0.7%3.1%
Jun 20242.2%2.4%0.7%3.1%
May 20242.2%2.4%0.7%3.1%
Apr 20242.2%2.4%0.7%3.1%
Mar 20242.2%2.4%0.7%3.2%
Feb 20242.2%2.4%0.6%3.1%
Jan 20242.2%2.4%0.6%3.2%
Dec 20232.2%2.5%0.5%3.9%
Nov 20232.2%2.5%0.5%3.9%
Oct 20232.3%2.5%0.5%3.9%
Sep 20232.3%2.5%0.5%4.0%
Aug 20232.3%2.5%0.5%4.0%
Jul 2023––––
Jun 20232.3%2.5%0.5%4.1%
May 20232.3%2.5%0.5%4.1%
Apr 20232.3%2.5%0.5%4.1%
Mar 20232.3%2.5%0.4%4.2%
Feb 20232.3%2.5%0.4%4.2%
Jan 20232.3%2.5%0.4%4.4%

CMS contract file, September 2026. Share of members with a carrier label. Includes employer group plans.

Where BCBS Michigan has members

States where BCBS Michigan has 1,000 or more members, largest first. Share is of that state's labelled members in September 2026. Change is in percentage points since September 2025. States where a carrier is small may be missing: the data keeps each state's ten largest carriers and any carrier above 1%. A contract that serves several states carries one carrier label, so a carrier can show members in a state where it is not a local plan.

Leads: Michigan. Holds 20% or more: Wyoming.

BCBS Michigan members by state, September 2026
StateMembersShareRankChange since September 2025Note
Michigan537,30836.5%1down 6.9 percentage pointsLeads
Iowa33,29312.6%4up 0.2 percentage points
Indiana17,7472.4%6down 0.3 percentage points
South Dakota10,60114.7%2down 4.4 percentage points
Missouri9,0561.2%7down 0.1 percentage points
North Dakota6,68812.5%2down 26.8 percentage points
Wyoming6,56234.7%2No change figureStrong
Tennessee4,6950.6%9no change
North Carolina3,9570.3%10no change
Alabama3,7930.5%9no change
South Carolina1,3230.2%11no change

Gained or lost the lead

Leader by labelled members in each state, September 2025 against September 2026.

BCBS Michigan lost the lead in North Dakota (to Medica).

Entries and exits

Counts include only 1,000 or more members.

BCBS Michigan had no members a year earlier and 1,000 or more in September 2026 in Wyoming (6,562).

Questions about BCBS Michigan

How many people are in BCBS Michigan Medicare Advantage plans?

669,751 members in September 2026, from the CMS contract file. The count includes employer group plans and is not limited to plans anyone can buy.

Is BCBS Michigan gaining or losing Medicare Advantage members?

Its share of labelled members edged down 0.3 points between September 2025 and September 2026, from 2.2% to 1.9%. Members fell from 754,604 to 669,751. The data does not show why.

Where does BCBS Michigan have the most members?

Michigan (537,308, 36.5% of that state's labelled members), Iowa (33,293, 12.6% of that state's labelled members), and Indiana (17,747, 2.4% of that state's labelled members) in September 2026.

Does this page show BCBS Michigan plan prices or benefits?

No. It counts members and shares. For plan details, use the carrier or Medicare.gov. Senior Deal Club is not affiliated with Medicare or any government agency. This page is educational. It counts members. It does not rate plans.

Cite and download

Cite this page

Senior Deal Club Standards Desk. BCBS Michigan Medicare Advantage Enrollment. Data as of September 2026. Source: CMS Medicare Advantage monthly enrollment, contract file. https://www.seniordealclub.com/medicare-advantage/enrollment/carriers/bcbs-michigan

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