MA Enrollment Explorer / Parent organizations / Blue Cross Blue Shield of Michigan Mutual Ins. Co.
Blue Cross Blue Shield of Michigan Mutual Ins. Co.: Medicare Advantage enrollment and market share
Blue Cross Blue Shield of Michigan Mutual Ins. Co. had 673,684 Medicare Advantage members in October 2026, #8 nationally with 1.9% of all MA enrollment. It lost 123,443 members (−15.5%) since October 2025, and has enrollment in 49 states and 971 counties with 11 or more members, leading the market in 86 of them. In the 2026 Annual Election Period (December to February) it lost 116,989 members (−14.7%). For 2027, 49,780 of its members are in plans that terminate and 0 in plans leaving their county, and it leaves 172 counties entirely. Among members who stay, 89,002 lose a Part B giveback and 0 an OTC allowance.
674KMA members, October 2026
−15.5%change since October 2025 (−123,443)
1.9%national MA share, rank 8
5contracts with enrollment
Largest states
| State | Members | Share of state MA |
|---|---|---|
| Michigan | 536,838 | 36.2% |
| Iowa | 33,261 | 12.5% |
| Florida | 18,659 | 0.6% |
| Indiana | 17,665 | 2.4% |
| South Dakota | 10,586 | 14.7% |
| Missouri | 9,018 | 1.2% |
| North Dakota | 6,690 | 12.4% |
| Wyoming | 6,564 | 34.3% |
| Tennessee | 4,692 | 0.6% |
| North Carolina | 3,980 | 0.3% |
| Alabama | 3,808 | 0.5% |
| Arizona | 2,634 | 0.3% |
| Ohio | 2,339 | 0.2% |
| Texas | 1,455 | 0.1% |
| South Carolina | 1,319 | 0.2% |
Largest counties
| County | Members | Change since October 2025 | Share of county MA |
|---|---|---|---|
| Wayne County, MI | 76,032 | −5,647 | 33.1% |
| Oakland County, MI | 69,353 | −5,818 | 44.7% |
| Macomb County, MI | 47,109 | −5,504 | 39.1% |
| Genesee County, MI | 30,736 | −2,924 | 45.6% |
| Washtenaw County, MI | 24,736 | −697 | 59.6% |
| Ingham County, MI | 16,516 | −1,532 | 45.5% |
| Kent County, MI | 16,430 | −2,252 | 17.6% |
| Livingston County, MI | 14,664 | −864 | 54.5% |
| Saginaw County, MI | 11,775 | −2,139 | 35.5% |
| St. Clair County, MI | 11,277 | −2,801 | 41.9% |
| Eaton County, MI | 10,543 | −1,009 | 54.8% |
| Kalamazoo County, MI | 9,989 | −798 | 27.5% |
| Monroe County, MI | 9,874 | −259 | 41.7% |
| Ottawa County, MI | 9,556 | −987 | 19.4% |
| Jackson County, MI | 9,504 | −981 | 39.9% |
Contracts
| Contract | Plan type | Oct 2024 | Oct 2025 | Oct 2026 |
|---|---|---|---|---|
| H9572 Blue Cross Blue Shield of Michigan | Local PPO | 562,287 | 575,592 | 555,892 |
| H5883 Blue Care Network | HMO/HMOPOS | 102,275 | 116,221 | 60,646 |
| H5900 Wellmark Advantage Health Plan | Local PPO | 19,021 | 47,062 | 43,859 |
| H6202 NextBlue of North Dakota | Local PPO | 14,478 | 20,943 | 6,708 |
| H9326 WyoBlue Advantage | Local PPO | n/a | n/a | 6,579 |
| H6898 Vermont Blue Advantage | Local PPO | 14,809 | 34,201 | 0 |
| H8095 Wellmark Advantage Health Plan | HMO/HMOPOS | 795 | 1,475 | 0 |
| H9489 Vermont Blue Advantage | HMO/HMOPOS | 566 | 1,633 | 0 |
Star ratings for these contracts are in the MA Quality Dashboard.