Free tool · public CMS data
Wisconsin Medicare Advantage market share
In September 2026, 739,071 Wisconsin Medicare beneficiaries were enrolled in a Medicare Advantage plan across 81 parent carriers and 72 counties, led by UnitedHealth Group, Inc. with 37.3% of counted enrollment.
Data month
September 2026
Advantage enrollees
739,071
+0.5% vs September 2025
Parent carriers
81
Advantage penetration
56.9%
CMS Medicare Monthly Enrollment, 2024
Carriers in Wisconsin
CMS Monthly Enrollment by Contract/Plan/State/County (CPSC) · September 2026
| # | Parent organisation | Enrollees | Share | Counties | vs September 2025 |
|---|---|---|---|---|---|
| 1 | UnitedHealth Group, Inc. | 275,473 | 37.3% | 72 | -12.1% |
| 2 | Network Health, Inc. | 132,187 | 17.9% | 72 | +54.0% |
| 3 | Humana Inc. | 118,916 | 16.1% | 72 | +30.9% |
| 4 | Sanford Health | 78,997 | 10.7% | 64 | — |
| 5 | Elevance Health, Inc. | 37,255 | 5.0% | 72 | -53.4% |
| 6 | CVS Health Corporation | 36,825 | 5.0% | 72 | +21.2% |
| 7 | University of Wisconsin Hospitals and Clincs Autho | 18,648 | 2.5% | 18 | -41.2% |
| 8 | Centene Corporation | 12,662 | 1.7% | 47 | +53.0% |
| 9 | Medica Holding Company | 11,489 | 1.6% | 65 | +6.3% |
| 10 | Aspirus, Inc. | 5,938 | 0.8% | 21 | +173.6% |
| 11 | HealthPartners, Inc. | 4,978 | 0.7% | 69 | -23.4% |
| 12 | Molina Healthcare, Inc. | 2,700 | 0.4% | 47 | +21.5% |
| 13 | Group Health Cooperative of Eau Claire | 1,149 | 0.2% | 50 | +865.5% |
| 14 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 684 | 0.1% | 72 | +4.1% |
| 15 | Health Care Service Corporation | 444 | 0.1% | 72 | +8.0% |
| 16 | Aware Integrated, Inc. | 264 | 0.0% | 72 | +225.9% |
| 17 | CareSource | 259 | 0.0% | 21 | — |
| 18 | Highmark Health | 190 | 0.0% | 72 | -1.6% |
| 19 | DLP Marquette Health Plan, LLC | 13 | 0.0% | 5 | — |
| 20 | Alignment Healthcare USA, LLC | 0 | 0.0% | 72 | — |
| 21 | Allina Health and Aetna Insurance Holding Company | 0 | 0.0% | 72 | — |
| 22 | AlohaCare | 0 | 0.0% | 1 | — |
| 23 | Athena Healthcare Holdings, LLC | 0 | 0.0% | 1 | — |
| 24 | Aultman Health Foundation | 0 | 0.0% | 72 | — |
| 25 | Baystate Health, Inc. | 0 | 0.0% | 72 | — |
| 26 | Blue Cross & Blue Shield of Rhode Island | 0 | 0.0% | 72 | — |
| 27 | Blue Cross and Blue Shield of Massachusetts, Inc. | 0 | 0.0% | 72 | — |
| 28 | Blue Cross Blue Shield of Arizona | 0 | 0.0% | 3 | — |
| 29 | Blue Cross Blue Shield of Kansas | 0 | 0.0% | 72 | — |
| 30 | Blue Cross Blue Shield of Nebraska | 0 | 0.0% | 72 | — |
| 31 | BlueCross BlueShield of Alabama | 0 | 0.0% | 72 | — |
| 32 | BlueCross BlueShield of South Carolina (BCBSSC) | 0 | 0.0% | 72 | — |
| 33 | BlueCross BlueShield of Tennessee | 0 | 0.0% | 72 | — |
| 34 | California Physicians' Service | 0 | 0.0% | 72 | — |
| 35 | Cambia Health Solutions, Inc. | 0 | 0.0% | 72 | — |
| 36 | CAPITAL BLUE CROSS | 0 | 0.0% | 72 | — |
| 37 | CareFirst, Inc. | 0 | 0.0% | 72 | — |
| 38 | CHRISTUS Health | 0 | 0.0% | 1 | — |
| 39 | Community Health Group | 0 | 0.0% | 2 | — |
| 40 | Community Health Plan of Washington | 0 | 0.0% | 1 | — |
| 41 | Corewell Health | 0 | 0.0% | 72 | — |
| 42 | CuraCor Solutions Corp. | 0 | 0.0% | 72 | — |
| 43 | Devoted Health, Inc. | 0 | 0.0% | 8 | — |
| 44 | EmblemHealth, Inc. | 0 | 0.0% | 72 | — |
| 45 | Fallon Community Health Plan, Inc. | 0 | 0.0% | 72 | — |
| 46 | Fenyx Health Holdings, Inc. | 0 | 0.0% | 72 | — |
| 47 | First Sacramento Capital Funding LLC | 0 | 0.0% | 1 | — |
| 48 | General Catalyst Group Management Holdings LP | 0 | 0.0% | 72 | — |
| 49 | Gold Kidney Health Plan | 0 | 0.0% | 1 | — |
| 50 | Guidewell Mutual Holding Corporation | 0 | 0.0% | 72 | — |
| 51 | Hawaii Medical Service Association | 0 | 0.0% | 72 | — |
| 52 | Health First Shared Services, Inc. | 0 | 0.0% | 1 | — |
| 53 | Healthfirst, Inc. | 0 | 0.0% | 72 | — |
| 54 | Henry Ford Health System | 0 | 0.0% | 72 | — |
| 55 | Horizon Mutual Holdings, Inc | 0 | 0.0% | 72 | — |
| 56 | Independence Health Group, Inc. | 0 | 0.0% | 72 | — |
| 57 | Independent Health Association, Inc. | 0 | 0.0% | 72 | — |
| 58 | Kaiser Foundation Health Plan, Inc. | 0 | 0.0% | 12 | — |
| 59 | Lifetime Healthcare, Inc. | 0 | 0.0% | 72 | — |
| 60 | Local Initiative Health Authority for LA County | 0 | 0.0% | 1 | — |
| 61 | Longevity Health Founders, LLC | 0 | 0.0% | 2 | — |
| 62 | Louisiana Health Service & Indemnity Company | 0 | 0.0% | 72 | — |
| 63 | Lumeris Group Holdings Corporation | 0 | 0.0% | 4 | — |
| 64 | Martin's Point Health Care, Inc. | 0 | 0.0% | 72 | — |
| 65 | MEDICAL MUTUAL OF OHIO | 0 | 0.0% | 72 | — |
| 66 | MHH Healthcare, L.P. | 0 | 0.0% | 4 | — |
| 67 | MVP Health Care, Inc. | 0 | 0.0% | 72 | — |
| 68 | Presbyterian Healthcare Services | 0 | 0.0% | 1 | — |
| 69 | Providence St Joseph Health | 0 | 0.0% | 1 | — |
| 70 | SCAN Group | 0 | 0.0% | 9 | — |
| 71 | Sharp Healthcare | 0 | 0.0% | 1 | — |
| 72 | South Country Health Alliance | 0 | 0.0% | 1 | — |
| 73 | The Health Plan of West Virginia, Inc. | 0 | 0.0% | 72 | — |
| 74 | The Regents of the University of California | 0 | 0.0% | 3 | — |
| 75 | Trinity Health Corporation | 0 | 0.0% | 7 | — |
| 76 | Ultimate Healthcare Holdings, LLC | 0 | 0.0% | 1 | — |
| 77 | Universal Health Services, Inc. | 0 | 0.0% | 6 | — |
| 78 | UPMC Health System | 0 | 0.0% | 72 | — |
| 79 | USAble Mutual Insurance Company | 0 | 0.0% | 72 | — |
| 80 | VISITING NURSE ASSOCIATION OF CENTRAL NEW YORK | 0 | 0.0% | 1 | — |
| 81 | Zing Health Consolidator, Inc | 0 | 0.0% | 3 | — |
County view
Leading carrier and Advantage enrollment in each Wisconsin county. Penetration is from CMS Medicare Monthly Enrollment, 2024.
| County | Advantage enrollees | Leading carrier | Leader share | Carriers | Penetration |
|---|---|---|---|---|---|
| Milwaukee | 112,944 | UnitedHealth Group, Inc. | 60.0% | 60 | 66.1% |
| Waukesha | 63,342 | UnitedHealth Group, Inc. | 59.0% | 55 | 59.0% |
| Brown | 40,967 | Network Health, Inc. | 37.9% | 54 | 69.9% |
| Dane | 36,566 | UnitedHealth Group, Inc. | 31.7% | 58 | 39.1% |
| Outagamie | 30,894 | Network Health, Inc. | 54.2% | 53 | 72.6% |
| Racine | 29,098 | UnitedHealth Group, Inc. | 52.3% | 52 | 60.8% |
| Winnebago | 27,473 | Network Health, Inc. | 50.7% | 51 | 70.5% |
| Washington | 22,330 | UnitedHealth Group, Inc. | 54.3% | 52 | 62.1% |
| Marathon | 21,006 | Sanford Health | 56.8% | 52 | 64.3% |
| Kenosha | 18,585 | UnitedHealth Group, Inc. | 49.4% | 52 | 52.5% |
| Sheboygan | 17,692 | UnitedHealth Group, Inc. | 39.5% | 54 | 59.5% |
| Fond du Lac | 17,247 | Network Health, Inc. | 56.5% | 50 | 66.9% |
| Rock | 17,068 | UnitedHealth Group, Inc. | 48.9% | 52 | 50.0% |
| Manitowoc | 14,503 | Network Health, Inc. | 37.4% | 51 | 62.7% |
| Wood | 13,650 | Sanford Health | 66.7% | 55 | 65.4% |
| Ozaukee | 13,622 | UnitedHealth Group, Inc. | 53.5% | 53 | 55.6% |
| La Crosse | 13,569 | University of Wisconsin Hospitals and Clincs Autho | 57.6% | 54 | 53.0% |
| Walworth | 12,038 | UnitedHealth Group, Inc. | 50.2% | 52 | 46.2% |
| Dodge | 11,436 | UnitedHealth Group, Inc. | 37.4% | 51 | 52.7% |
| Waupaca | 10,810 | Network Health, Inc. | 47.8% | 54 | 69.7% |
| Marinette | 9,230 | UnitedHealth Group, Inc. | 38.1% | 51 | 63.7% |
| Portage | 9,042 | Sanford Health | 42.1% | 55 | 55.6% |
| Eau Claire | 8,691 | Sanford Health | 59.8% | 53 | 48.5% |
| Oconto | 8,330 | Network Health, Inc. | 35.7% | 51 | 73.0% |
| Jefferson | 8,030 | UnitedHealth Group, Inc. | 49.9% | 52 | 44.7% |
| Shawano | 7,820 | Network Health, Inc. | 39.5% | 52 | 69.7% |
| Calumet | 7,406 | Network Health, Inc. | 60.5% | 50 | 71.6% |
| Chippewa | 7,002 | Sanford Health | 68.0% | 50 | 48.7% |
| Oneida | 6,773 | Sanford Health | 47.7% | 53 | 51.2% |
| Barron | 5,815 | Sanford Health | 72.0% | 52 | 52.8% |
| Columbia | 5,416 | Medica Holding Company | 26.4% | 54 | 42.4% |
| Lincoln | 5,292 | Sanford Health | 47.0% | 53 | 60.7% |
| Door | 5,273 | Humana Inc. | 36.2% | 51 | 46.0% |
| Waushara | 5,250 | Network Health, Inc. | 39.6% | 53 | 67.1% |
| Clark | 4,582 | Sanford Health | 77.0% | 51 | 60.1% |
| Sauk | 4,525 | UnitedHealth Group, Inc. | 39.0% | 53 | 40.1% |
| Vilas | 4,143 | Sanford Health | 47.4% | 51 | 45.2% |
| Monroe | 4,137 | University of Wisconsin Hospitals and Clincs Autho | 42.6% | 52 | 40.8% |
| Langlade | 4,079 | Sanford Health | 39.3% | 51 | 63.4% |
| Adams | 3,741 | UnitedHealth Group, Inc. | 42.6% | 53 | 47.9% |
| Green Lake | 3,717 | Network Health, Inc. | 56.9% | 50 | 64.2% |
| Kewaunee | 3,671 | Network Health, Inc. | 39.8% | 50 | 68.5% |
| Trempealeau | 3,492 | University of Wisconsin Hospitals and Clincs Autho | 40.8% | 51 | 49.6% |
| Vernon | 3,396 | CVS Health Corporation | 60.5% | 52 | 57.5% |
| Dunn | 3,335 | Sanford Health | 56.2% | 48 | 46.0% |
| Green | 3,242 | UnitedHealth Group, Inc. | 41.9% | 51 | 35.0% |
| Taylor | 3,194 | Sanford Health | 66.2% | 51 | 61.4% |
| Douglas | 3,060 | Sanford Health | 43.4% | 51 | 63.3% |
| Juneau | 2,918 | Humana Inc. | 30.4% | 54 | 42.1% |
| Grant | 2,766 | UnitedHealth Group, Inc. | 84.1% | 50 | 50.9% |
| Marquette | 2,758 | Network Health, Inc. | 33.5% | 54 | 53.2% |
| Price | 2,574 | Sanford Health | 68.6% | 51 | 52.5% |
| Sawyer | 2,505 | Sanford Health | 64.8% | 50 | 49.5% |
| Rusk | 2,437 | Sanford Health | 74.0% | 49 | 55.5% |
| St. Croix | 2,437 | UnitedHealth Group, Inc. | 47.0% | 51 | 51.8% |
| Washburn | 2,389 | Sanford Health | 68.2% | 49 | 51.6% |
| Polk | 2,336 | Humana Inc. | 30.1% | 50 | 53.8% |
| Jackson | 2,163 | Sanford Health | 53.6% | 50 | 51.3% |
| Burnett | 1,880 | Sanford Health | 44.9% | 51 | 49.0% |
| Bayfield | 1,541 | Sanford Health | 58.5% | 50 | 44.7% |
| Iowa | 1,533 | UnitedHealth Group, Inc. | 38.3% | 50 | 37.7% |
| Ashland | 1,529 | Sanford Health | 60.6% | 49 | 46.7% |
| Forest | 1,468 | UnitedHealth Group, Inc. | 36.4% | 50 | 51.2% |
| Pierce | 1,371 | UnitedHealth Group, Inc. | 38.0% | 50 | 53.0% |
| Richland | 1,356 | Humana Inc. | 48.7% | 52 | 32.8% |
| Crawford | 1,313 | Humana Inc. | 33.1% | 53 | 46.4% |
| Buffalo | 1,182 | Sanford Health | 43.1% | 51 | 37.8% |
| Iron | 1,182 | Sanford Health | 65.2% | 49 | 56.0% |
| Lafayette | 930 | UnitedHealth Group, Inc. | 56.5% | 50 | 43.4% |
| Florence | 796 | UnitedHealth Group, Inc. | 42.2% | 52 | 49.2% |
| Pepin | 678 | Sanford Health | 67.7% | 50 | 39.6% |
| Menominee | 505 | UnitedHealth Group, Inc. | 37.8% | 49 | 56.3% |
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).