Free tool · public CMS data
Michigan Medicare Advantage market share
In September 2026, 1,464,676 Michigan Medicare beneficiaries were enrolled in a Medicare Advantage plan across 91 parent carriers and 83 counties, led by Blue Cross Blue Shield of Michigan Mutual Ins. Co. with 36.6% of counted enrollment.
Data month
September 2026
Advantage enrollees
1,464,676
+4.5% vs September 2025
Parent carriers
91
Advantage penetration
61.5%
CMS Medicare Monthly Enrollment, 2024
Carriers in Michigan
CMS Monthly Enrollment by Contract/Plan/State/County (CPSC) · September 2026
| # | Parent organisation | Enrollees | Share | Counties | vs September 2025 |
|---|---|---|---|---|---|
| 1 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 536,480 | 36.6% | 83 | -11.7% |
| 2 | Corewell Health | 284,712 | 19.4% | 83 | +12.8% |
| 3 | Humana Inc. | 248,049 | 16.9% | 83 | +22.2% |
| 4 | Henry Ford Health System | 132,027 | 9.0% | 83 | +54.3% |
| 5 | CVS Health Corporation | 102,678 | 7.0% | 83 | +10.7% |
| 6 | UnitedHealth Group, Inc. | 77,289 | 5.3% | 83 | -14.1% |
| 7 | Centene Corporation | 29,992 | 2.0% | 61 | +10.9% |
| 8 | Molina Healthcare, Inc. | 15,233 | 1.0% | 67 | +56.4% |
| 9 | Zing Health Consolidator, Inc | 11,859 | 0.8% | 18 | +49.1% |
| 10 | Trinity Health Corporation | 10,878 | 0.7% | 39 | +83.4% |
| 11 | DLP Marquette Health Plan, LLC | 2,971 | 0.2% | 25 | — |
| 12 | MEDICAL MUTUAL OF OHIO | 2,818 | 0.2% | 83 | +0.3% |
| 13 | Elevance Health, Inc. | 2,726 | 0.2% | 83 | -2.5% |
| 14 | McLaren Health Care Corporation | 2,018 | 0.1% | 61 | -18.8% |
| 15 | Independence Health Group, Inc. | 1,793 | 0.1% | 83 | — |
| 16 | Curana Health Holdings, LLC | 1,457 | 0.1% | 24 | +45.3% |
| 17 | Longevity Health Founders, LLC | 1,310 | 0.1% | 39 | +4.1% |
| 18 | Highmark Health | 321 | 0.0% | 83 | -10.3% |
| 19 | Health Care Service Corporation | 65 | 0.0% | 83 | -3.0% |
| 20 | Alignment Healthcare USA, LLC | 0 | 0.0% | 83 | — |
| 21 | Allina Health and Aetna Insurance Holding Company | 0 | 0.0% | 83 | — |
| 22 | AlohaCare | 0 | 0.0% | 1 | — |
| 23 | Aspirus, Inc. | 0 | 0.0% | 1 | — |
| 24 | Athena Healthcare Holdings, LLC | 0 | 0.0% | 1 | — |
| 25 | Aultman Health Foundation | 0 | 0.0% | 83 | — |
| 26 | Aware Integrated, Inc. | 0 | 0.0% | 83 | — |
| 27 | Baystate Health, Inc. | 0 | 0.0% | 83 | — |
| 28 | Blue Cross & Blue Shield of Rhode Island | 0 | 0.0% | 83 | — |
| 29 | Blue Cross and Blue Shield of Massachusetts, Inc. | 0 | 0.0% | 83 | — |
| 30 | Blue Cross Blue Shield of Arizona | 0 | 0.0% | 2 | — |
| 31 | Blue Cross Blue Shield of Kansas | 0 | 0.0% | 83 | — |
| 32 | Blue Cross Blue Shield of Nebraska | 0 | 0.0% | 83 | — |
| 33 | BlueCross BlueShield of Alabama | 0 | 0.0% | 83 | — |
| 34 | BlueCross BlueShield of South Carolina (BCBSSC) | 0 | 0.0% | 83 | — |
| 35 | BlueCross BlueShield of Tennessee | 0 | 0.0% | 83 | — |
| 36 | California Physicians' Service | 0 | 0.0% | 83 | — |
| 37 | Cambia Health Solutions, Inc. | 0 | 0.0% | 83 | — |
| 38 | CAPITAL BLUE CROSS | 0 | 0.0% | 83 | — |
| 39 | CareFirst, Inc. | 0 | 0.0% | 83 | — |
| 40 | CareSource | 0 | 0.0% | 9 | — |
| 41 | Clover Health Holdings, Inc. | 0 | 0.0% | 1 | — |
| 42 | Community Health Group | 0 | 0.0% | 1 | — |
| 43 | CuraCor Solutions Corp. | 0 | 0.0% | 83 | — |
| 44 | Devoted Health, Inc. | 0 | 0.0% | 13 | — |
| 45 | Elderplan, Inc. | 0 | 0.0% | 1 | — |
| 46 | EmblemHealth, Inc. | 0 | 0.0% | 83 | — |
| 47 | Fallon Community Health Plan, Inc. | 0 | 0.0% | 83 | — |
| 48 | Fenyx Health Holdings, Inc. | 0 | 0.0% | 83 | — |
| 49 | Gemstone Holdings, Inc. | 0 | 0.0% | 1 | — |
| 50 | General Catalyst Group Management Holdings LP | 0 | 0.0% | 83 | — |
| 51 | Gold Kidney Health Plan | 0 | 0.0% | 2 | — |
| 52 | Guidewell Mutual Holding Corporation | 0 | 0.0% | 83 | — |
| 53 | Hawaii Medical Service Association | 0 | 0.0% | 83 | — |
| 54 | Health First Shared Services, Inc. | 0 | 0.0% | 1 | — |
| 55 | Healthfirst, Inc. | 0 | 0.0% | 83 | — |
| 56 | HealthPartners, Inc. | 0 | 0.0% | 83 | — |
| 57 | Horizon Mutual Holdings, Inc | 0 | 0.0% | 83 | — |
| 58 | Imperial Health Plan of California | 0 | 0.0% | 3 | — |
| 59 | Independent Health Association, Inc. | 0 | 0.0% | 83 | — |
| 60 | INLAND EMPIRE HEALTH PLAN | 0 | 0.0% | 1 | — |
| 61 | Intermountain Health Care, Inc. | 0 | 0.0% | 1 | — |
| 62 | Kaiser Foundation Health Plan, Inc. | 0 | 0.0% | 14 | — |
| 63 | Lifetime Healthcare, Inc. | 0 | 0.0% | 83 | — |
| 64 | Local Initiative Health Authority for LA County | 0 | 0.0% | 1 | — |
| 65 | Louisiana Health Service & Indemnity Company | 0 | 0.0% | 83 | — |
| 66 | Martin's Point Health Care, Inc. | 0 | 0.0% | 83 | — |
| 67 | Mass General Brigham Incorporated | 0 | 0.0% | 1 | — |
| 68 | Medica Holding Company | 0 | 0.0% | 83 | — |
| 69 | Memorial Hermann Health System | 0 | 0.0% | 1 | — |
| 70 | Mercy Care | 0 | 0.0% | 1 | — |
| 71 | MHH Healthcare, L.P. | 0 | 0.0% | 1 | — |
| 72 | Missouri Healthcare Advisors, LLC | 0 | 0.0% | 1 | — |
| 73 | MVP Health Care, Inc. | 0 | 0.0% | 83 | — |
| 74 | Network Health, Inc. | 0 | 0.0% | 83 | — |
| 75 | PacificSource | 0 | 0.0% | 1 | — |
| 76 | Perennial Consortium, LLC | 0 | 0.0% | 1 | — |
| 77 | Point32Health, Inc. | 0 | 0.0% | 4 | — |
| 78 | Presbyterian Healthcare Services | 0 | 0.0% | 1 | — |
| 79 | Providence St Joseph Health | 0 | 0.0% | 1 | — |
| 80 | Risant Health, Inc. | 0 | 0.0% | 3 | — |
| 81 | Sanford Health | 0 | 0.0% | 7 | — |
| 82 | SANTA CLARA COUNTY HEALTH AUTHORITY | 0 | 0.0% | 1 | — |
| 83 | SCAN Group | 0 | 0.0% | 13 | — |
| 84 | Sharp Healthcare | 0 | 0.0% | 1 | — |
| 85 | The Health Plan of West Virginia, Inc. | 0 | 0.0% | 83 | — |
| 86 | The Regents of the University of California | 0 | 0.0% | 1 | — |
| 87 | Ultimate Healthcare Holdings, LLC | 0 | 0.0% | 3 | — |
| 88 | Universal Health Services, Inc. | 0 | 0.0% | 7 | — |
| 89 | UPMC Health System | 0 | 0.0% | 83 | — |
| 90 | USAble Mutual Insurance Company | 0 | 0.0% | 83 | — |
| 91 | West Virginia United Health System, Inc. | 0 | 0.0% | 1 | — |
County view
Leading carrier and Advantage enrollment in each Michigan county. Penetration is from CMS Medicare Monthly Enrollment, 2024.
| County | Advantage enrollees | Leading carrier | Leader share | Carriers | Penetration |
|---|---|---|---|---|---|
| Wayne | 227,889 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 33.4% | 65 | 63.1% |
| Oakland | 154,311 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 45.0% | 65 | 53.9% |
| Macomb | 119,500 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 39.4% | 60 | 57.6% |
| Kent | 92,767 | Corewell Health | 61.4% | 62 | 71.5% |
| Genesee | 67,005 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 45.9% | 58 | 66.7% |
| Ottawa | 48,796 | Corewell Health | 66.7% | 59 | 75.6% |
| Washtenaw | 41,100 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 60.2% | 64 | 58.5% |
| Ingham | 36,019 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 45.8% | 57 | 65.5% |
| Kalamazoo | 35,867 | Corewell Health | 36.8% | 55 | 65.3% |
| Saginaw | 32,942 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 35.8% | 54 | 66.5% |
| Muskegon | 32,577 | Corewell Health | 38.6% | 55 | 72.3% |
| St. Clair | 26,922 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 42.8% | 54 | 60.3% |
| Livingston | 26,732 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 54.9% | 59 | 56.6% |
| Monroe | 23,472 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 42.0% | 56 | 59.1% |
| Jackson | 23,434 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 40.5% | 54 | 57.3% |
| Berrien | 22,357 | Humana Inc. | 35.3% | 53 | 54.9% |
| Allegan | 20,148 | Corewell Health | 59.8% | 54 | 72.0% |
| Eaton | 19,011 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 55.4% | 53 | 68.9% |
| Bay | 18,540 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 40.3% | 52 | 61.2% |
| Calhoun | 17,823 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 29.8% | 53 | 54.6% |
| Grand Traverse | 17,151 | Corewell Health | 44.8% | 51 | 62.7% |
| Lenawee | 15,352 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 47.6% | 52 | 58.2% |
| Lapeer | 14,348 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 48.4% | 54 | 61.3% |
| Midland | 13,505 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 35.7% | 52 | 63.3% |
| Van Buren | 12,612 | Corewell Health | 35.8% | 51 | 62.9% |
| Clinton | 12,316 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 59.5% | 52 | 69.8% |
| Shiawassee | 11,745 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 50.0% | 53 | 64.8% |
| Montcalm | 11,412 | Corewell Health | 45.7% | 53 | 67.7% |
| Barry | 10,181 | Corewell Health | 51.2% | 53 | 67.1% |
| Newaygo | 10,177 | Corewell Health | 59.9% | 54 | 74.7% |
| Marquette | 10,113 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 40.9% | 50 | 59.4% |
| Ionia | 10,037 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 41.1% | 50 | 71.1% |
| Tuscola | 9,862 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 40.5% | 55 | 64.9% |
| St. Joseph | 8,183 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 28.9% | 48 | 55.3% |
| Hillsdale | 7,550 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 31.4% | 50 | 61.0% |
| Cass | 7,364 | Humana Inc. | 42.5% | 51 | 54.4% |
| Isabella | 7,355 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 47.2% | 51 | 57.6% |
| Mecosta | 7,202 | Corewell Health | 41.1% | 53 | 64.5% |
| Clare | 6,907 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 37.3% | 53 | 63.2% |
| Sanilac | 6,730 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 35.0% | 52 | 55.4% |
| Delta | 6,636 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 41.5% | 49 | 56.6% |
| Roscommon | 6,633 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 43.0% | 52 | 62.2% |
| Branch | 6,245 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 42.2% | 50 | 56.8% |
| Mason | 6,239 | Corewell Health | 48.5% | 52 | 64.6% |
| Gratiot | 6,141 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 51.0% | 52 | 62.3% |
| Wexford | 5,959 | Corewell Health | 38.0% | 50 | 61.3% |
| Gladwin | 5,862 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 40.4% | 51 | 64.4% |
| Emmet | 5,644 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 36.7% | 49 | 52.1% |
| Iosco | 5,580 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 43.2% | 52 | 57.5% |
| Huron | 5,537 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 33.7% | 52 | 50.6% |
| Alpena | 5,443 | Corewell Health | 41.3% | 50 | 53.6% |
| Manistee | 5,330 | Corewell Health | 37.9% | 52 | 60.4% |
| Oceana | 5,313 | Corewell Health | 45.5% | 53 | 65.8% |
| Cheboygan | 5,065 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 36.5% | 49 | 56.9% |
| Antrim | 4,912 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 34.8% | 51 | 59.0% |
| Chippewa | 4,911 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 60.7% | 50 | 56.8% |
| Leelanau | 4,849 | Corewell Health | 46.6% | 50 | 59.1% |
| Charlevoix | 4,705 | Corewell Health | 35.8% | 50 | 54.3% |
| Osceola | 4,424 | Corewell Health | 46.7% | 53 | 63.2% |
| Ogemaw | 4,357 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 43.5% | 51 | 56.8% |
| Houghton | 4,239 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 51.3% | 49 | 52.9% |
| Otsego | 3,953 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 38.4% | 52 | 52.9% |
| Menominee | 3,907 | Humana Inc. | 71.8% | 48 | 54.8% |
| Dickinson | 3,892 | Humana Inc. | 50.0% | 48 | 50.9% |
| Benzie | 3,596 | Corewell Health | 38.5% | 50 | 59.4% |
| Arenac | 3,306 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 40.2% | 51 | 61.1% |
| Kalkaska | 3,275 | Corewell Health | 30.4% | 50 | 61.6% |
| Presque Isle | 3,004 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 37.0% | 49 | 55.2% |
| Lake | 2,865 | Corewell Health | 36.9% | 52 | 67.7% |
| Alcona | 2,649 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 44.7% | 51 | 57.6% |
| Missaukee | 2,635 | Corewell Health | 41.3% | 50 | 61.9% |
| Crawford | 2,604 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 39.9% | 52 | 58.4% |
| Montmorency | 2,484 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 40.2% | 50 | 58.8% |
| Iron | 2,385 | Humana Inc. | 49.6% | 48 | 54.7% |
| Mackinac | 2,158 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 63.0% | 49 | 58.4% |
| Gogebic | 2,072 | Humana Inc. | 56.3% | 50 | 50.1% |
| Oscoda | 1,790 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 39.9% | 50 | 58.3% |
| Schoolcraft | 1,560 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 52.0% | 49 | 52.1% |
| Alger | 1,495 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 56.5% | 50 | 54.5% |
| Baraga | 1,228 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 37.8% | 49 | 53.4% |
| Ontonagon | 1,111 | Humana Inc. | 40.0% | 48 | 46.1% |
| Luce | 1,054 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 56.5% | 48 | 64.6% |
| Keweenaw | 315 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 53.3% | 48 | 47.6% |
What is missing
CMS suppresses any plan-county cell with fewer than 11 enrollees. Those enrollees are missing from these counts, so every figure is a floor, not an exact total.
What is counted
Counts cover Medicare Advantage contracts only (Local CCP, Regional CCP, PFFS and MSA). Standalone Part D drug plans, cost plans, HCPP and PACE contracts are excluded.
Source: CMS Monthly Enrollment by Contract/Plan/State/County (CPSC).