Free tool · public CMS data
Illinois Medicare Advantage market share
In September 2026, 1,078,152 Illinois Medicare beneficiaries were enrolled in a Medicare Advantage plan across 88 parent carriers and 102 counties, led by CVS Health Corporation with 31.9% of counted enrollment.
Data month
September 2026
Advantage enrollees
1,078,152
+9.9% vs September 2025
Parent carriers
88
Advantage penetration
42.8%
CMS Medicare Monthly Enrollment, 2024
Carriers in Illinois
CMS Monthly Enrollment by Contract/Plan/State/County (CPSC) · September 2026
| # | Parent organisation | Enrollees | Share | Counties | vs September 2025 |
|---|---|---|---|---|---|
| 1 | CVS Health Corporation | 343,794 | 31.9% | 102 | +6.0% |
| 2 | Humana Inc. | 333,565 | 30.9% | 102 | +32.4% |
| 3 | UnitedHealth Group, Inc. | 217,370 | 20.2% | 102 | -2.0% |
| 4 | Health Care Service Corporation | 67,674 | 6.3% | 102 | -12.8% |
| 5 | Centene Corporation | 47,953 | 4.4% | 102 | +35.0% |
| 6 | Zing Health Consolidator, Inc | 19,184 | 1.8% | 17 | +15.1% |
| 7 | Molina Healthcare, Inc. | 14,935 | 1.4% | 102 | +16680.9% |
| 8 | Devoted Health, Inc. | 14,330 | 1.3% | 36 | +73.5% |
| 9 | Lumeris Group Holdings Corporation | 13,825 | 1.3% | 22 | +24.7% |
| 10 | Elevance Health, Inc. | 1,770 | 0.2% | 102 | -1.1% |
| 11 | Rifkin Managed Care Holding, LLC | 1,101 | 0.1% | 8 | -9.8% |
| 12 | Longevity Health Founders, LLC | 966 | 0.1% | 7 | +0.1% |
| 13 | Highmark Health | 853 | 0.1% | 102 | +3.4% |
| 14 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 803 | 0.1% | 102 | -2.2% |
| 15 | California Physicians' Service | 29 | 0.0% | 102 | 0.0% |
| 16 | Alignment Healthcare USA, LLC | 0 | 0.0% | 102 | — |
| 17 | Allina Health and Aetna Insurance Holding Company | 0 | 0.0% | 102 | — |
| 18 | Aspirus, Inc. | 0 | 0.0% | 1 | — |
| 19 | Astiva Health Holdings Incorporated | 0 | 0.0% | 1 | — |
| 20 | Athena Healthcare Holdings, LLC | 0 | 0.0% | 2 | — |
| 21 | Aultman Health Foundation | 0 | 0.0% | 102 | — |
| 22 | Aware Integrated, Inc. | 0 | 0.0% | 102 | — |
| 23 | BayCare Health System, Inc. | 0 | 0.0% | 1 | — |
| 24 | Baylor Scott & White Health | 0 | 0.0% | 2 | — |
| 25 | Baystate Health, Inc. | 0 | 0.0% | 102 | — |
| 26 | Blue Cross & Blue Shield of Rhode Island | 0 | 0.0% | 102 | — |
| 27 | Blue Cross and Blue Shield of Massachusetts, Inc. | 0 | 0.0% | 102 | — |
| 28 | Blue Cross Blue Shield of Arizona | 0 | 0.0% | 3 | — |
| 29 | Blue Cross Blue Shield of Kansas | 0 | 0.0% | 102 | — |
| 30 | Blue Cross Blue Shield of Nebraska | 0 | 0.0% | 102 | — |
| 31 | BlueCross BlueShield of Alabama | 0 | 0.0% | 102 | — |
| 32 | BlueCross BlueShield of South Carolina (BCBSSC) | 0 | 0.0% | 102 | — |
| 33 | BlueCross BlueShield of Tennessee | 0 | 0.0% | 102 | — |
| 34 | Cambia Health Solutions, Inc. | 0 | 0.0% | 102 | — |
| 35 | CAPITAL BLUE CROSS | 0 | 0.0% | 102 | — |
| 36 | CareFirst, Inc. | 0 | 0.0% | 102 | — |
| 37 | CareSource | 0 | 0.0% | 6 | — |
| 38 | Clever Care Health Plan, Inc. | 0 | 0.0% | 1 | — |
| 39 | Clover Health Holdings, Inc. | 0 | 0.0% | 2 | — |
| 40 | Community Health Group | 0 | 0.0% | 2 | — |
| 41 | Corewell Health | 0 | 0.0% | 102 | — |
| 42 | CoxHealth | 0 | 0.0% | 1 | — |
| 43 | CuraCor Solutions Corp. | 0 | 0.0% | 102 | — |
| 44 | DLP Marquette Health Plan, LLC | 0 | 0.0% | 1 | — |
| 45 | DOCTORS HEALTHCARE PLANS, INC. | 0 | 0.0% | 1 | — |
| 46 | EmblemHealth, Inc. | 0 | 0.0% | 102 | — |
| 47 | Fallon Community Health Plan, Inc. | 0 | 0.0% | 102 | — |
| 48 | Fenyx Health Holdings, Inc. | 0 | 0.0% | 102 | — |
| 49 | First Sacramento Capital Funding LLC | 0 | 0.0% | 1 | — |
| 50 | General Catalyst Group Management Holdings LP | 0 | 0.0% | 102 | — |
| 51 | Gold Kidney Health Plan | 0 | 0.0% | 1 | — |
| 52 | Guidewell Mutual Holding Corporation | 0 | 0.0% | 102 | — |
| 53 | Hawaii Medical Service Association | 0 | 0.0% | 102 | — |
| 54 | Healthfirst, Inc. | 0 | 0.0% | 102 | — |
| 55 | HealthPartners, Inc. | 0 | 0.0% | 102 | — |
| 56 | Henry Ford Health System | 0 | 0.0% | 102 | — |
| 57 | Horizon Mutual Holdings, Inc | 0 | 0.0% | 102 | — |
| 58 | Imperial Health Plan of California | 0 | 0.0% | 6 | — |
| 59 | Independence Health Group, Inc. | 0 | 0.0% | 102 | — |
| 60 | Independent Health Association, Inc. | 0 | 0.0% | 102 | — |
| 61 | INLAND EMPIRE HEALTH PLAN | 0 | 0.0% | 1 | — |
| 62 | Intermountain Health Care, Inc. | 0 | 0.0% | 2 | — |
| 63 | Kaiser Foundation Health Plan, Inc. | 0 | 0.0% | 11 | — |
| 64 | LifeBridge Health, Inc. | 0 | 0.0% | 1 | — |
| 65 | Lifetime Healthcare, Inc. | 0 | 0.0% | 102 | — |
| 66 | Local Initiative Health Authority for LA County | 0 | 0.0% | 1 | — |
| 67 | Louisiana Health Service & Indemnity Company | 0 | 0.0% | 102 | — |
| 68 | Martin's Point Health Care, Inc. | 0 | 0.0% | 102 | — |
| 69 | Mass General Brigham Incorporated | 0 | 0.0% | 1 | — |
| 70 | Medica Holding Company | 0 | 0.0% | 102 | -100.0% |
| 71 | MEDICAL MUTUAL OF OHIO | 0 | 0.0% | 102 | — |
| 72 | Mercy Care | 0 | 0.0% | 1 | — |
| 73 | MHH Healthcare, L.P. | 0 | 0.0% | 2 | — |
| 74 | MVP Health Care, Inc. | 0 | 0.0% | 102 | — |
| 75 | Network Health, Inc. | 0 | 0.0% | 102 | — |
| 76 | Providence St Joseph Health | 0 | 0.0% | 1 | — |
| 77 | Sanford Health | 0 | 0.0% | 2 | — |
| 78 | SCAN Group | 0 | 0.0% | 9 | — |
| 79 | Sharp Healthcare | 0 | 0.0% | 1 | — |
| 80 | SIHO Holding, Inc. | 0 | 0.0% | 1 | — |
| 81 | SNP Holdings, LLC | 0 | 0.0% | 2 | — |
| 82 | The Health Plan of West Virginia, Inc. | 0 | 0.0% | 102 | — |
| 83 | The Regents of the University of California | 0 | 0.0% | 1 | — |
| 84 | Trinity Health Corporation | 0 | 0.0% | 7 | — |
| 85 | Universal Health Services, Inc. | 0 | 0.0% | 6 | — |
| 86 | UPMC Health System | 0 | 0.0% | 102 | — |
| 87 | USAble Mutual Insurance Company | 0 | 0.0% | 102 | — |
| 88 | Visiting Nurse Service of New York | 0 | 0.0% | 2 | — |
County view
Leading carrier and Advantage enrollment in each Illinois county. Penetration is from CMS Medicare Monthly Enrollment, 2024.
| County | Advantage enrollees | Leading carrier | Leader share | Carriers | Penetration |
|---|---|---|---|---|---|
| Cook | 399,259 | Humana Inc. | 37.0% | 70 | 43.8% |
| DuPage | 70,653 | Humana Inc. | 42.8% | 62 | 38.0% |
| Will | 52,350 | Humana Inc. | 42.2% | 60 | 41.4% |
| Lake | 46,580 | Humana Inc. | 44.7% | 66 | 33.4% |
| Kane | 38,048 | Humana Inc. | 38.0% | 57 | 40.2% |
| Winnebago | 37,391 | CVS Health Corporation | 50.6% | 54 | 56.6% |
| Madison | 33,379 | UnitedHealth Group, Inc. | 41.9% | 53 | 53.5% |
| St. Clair | 30,128 | UnitedHealth Group, Inc. | 43.6% | 52 | 54.7% |
| Sangamon | 26,821 | CVS Health Corporation | 74.5% | 53 | 56.5% |
| McHenry | 24,516 | Humana Inc. | 43.5% | 56 | 35.7% |
| Champaign | 19,617 | CVS Health Corporation | 75.2% | 51 | 58.4% |
| Peoria | 19,417 | Humana Inc. | 41.0% | 52 | 49.4% |
| Rock Island | 19,398 | CVS Health Corporation | 50.2% | 50 | 57.8% |
| Tazewell | 14,042 | Humana Inc. | 40.5% | 49 | 43.5% |
| McLean | 13,568 | CVS Health Corporation | 48.4% | 51 | 44.2% |
| Vermilion | 9,933 | CVS Health Corporation | 63.1% | 49 | 54.5% |
| La Salle | 9,502 | CVS Health Corporation | 37.1% | 50 | — |
| Kankakee | 9,244 | CVS Health Corporation | 39.1% | 53 | 38.8% |
| Macon | 9,167 | CVS Health Corporation | 60.4% | 50 | 35.7% |
| Kendall | 7,900 | Humana Inc. | 50.5% | 52 | 39.8% |
| DeKalb | 7,842 | CVS Health Corporation | 50.9% | 51 | 40.6% |
| Stephenson | 7,412 | CVS Health Corporation | 60.6% | 50 | 59.9% |
| Adams | 5,955 | UnitedHealth Group, Inc. | 59.9% | 49 | 37.5% |
| Henry | 5,890 | CVS Health Corporation | 48.2% | 49 | 47.0% |
| Whiteside | 5,871 | UnitedHealth Group, Inc. | 47.5% | 50 | 39.0% |
| Knox | 5,767 | Humana Inc. | 36.7% | 50 | 44.7% |
| Ogle | 5,764 | CVS Health Corporation | 57.2% | 52 | 45.6% |
| Boone | 5,670 | CVS Health Corporation | 46.9% | 51 | 50.8% |
| Williamson | 5,569 | CVS Health Corporation | 59.5% | 50 | 36.5% |
| Jackson | 5,435 | CVS Health Corporation | 58.6% | 49 | 48.1% |
| Macoupin | 5,087 | CVS Health Corporation | 42.9% | 53 | 41.3% |
| Coles | 5,008 | CVS Health Corporation | 68.1% | 49 | 43.7% |
| Monroe | 4,530 | UnitedHealth Group, Inc. | 38.5% | 51 | 54.3% |
| Fulton | 3,851 | CVS Health Corporation | 49.7% | 49 | 43.5% |
| Christian | 3,738 | CVS Health Corporation | 68.9% | 51 | 45.1% |
| Grundy | 3,537 | Humana Inc. | 42.5% | 51 | 33.3% |
| Morgan | 3,524 | CVS Health Corporation | 57.9% | 50 | 41.6% |
| Livingston | 3,414 | Humana Inc. | 43.0% | 50 | 39.6% |
| Lee | 3,410 | CVS Health Corporation | 50.8% | 50 | 38.8% |
| Randolph | 3,351 | CVS Health Corporation | 49.2% | 51 | 48.1% |
| Clinton | 3,310 | UnitedHealth Group, Inc. | 53.1% | 51 | 37.7% |
| Franklin | 3,306 | CVS Health Corporation | 48.3% | 50 | 39.4% |
| Marion | 3,100 | UnitedHealth Group, Inc. | 48.4% | 50 | 28.2% |
| Woodford | 3,074 | Humana Inc. | 48.0% | 49 | 36.8% |
| Logan | 2,886 | CVS Health Corporation | 58.2% | 51 | 44.6% |
| McDonough | 2,772 | CVS Health Corporation | 65.1% | 49 | 44.8% |
| Montgomery | 2,725 | CVS Health Corporation | 62.9% | 51 | 36.9% |
| Bureau | 2,710 | CVS Health Corporation | 50.7% | 49 | 30.4% |
| Jefferson | 2,623 | CVS Health Corporation | 49.7% | 49 | 29.8% |
| Jersey | 2,550 | UnitedHealth Group, Inc. | 54.7% | 51 | 43.9% |
| Iroquois | 2,299 | CVS Health Corporation | 42.5% | 51 | 32.7% |
| Effingham | 2,285 | CVS Health Corporation | 68.9% | 50 | 25.5% |
| Piatt | 2,225 | CVS Health Corporation | 75.5% | 49 | 55.3% |
| Douglas | 2,044 | CVS Health Corporation | 78.7% | 51 | 48.5% |
| Saline | 1,944 | CVS Health Corporation | 52.2% | 49 | 34.9% |
| Jo Daviess | 1,925 | CVS Health Corporation | 48.4% | 50 | 57.8% |
| Union | 1,915 | CVS Health Corporation | 64.9% | 50 | 42.0% |
| Mercer | 1,904 | UnitedHealth Group, Inc. | 53.5% | 49 | 50.1% |
| Carroll | 1,707 | UnitedHealth Group, Inc. | 34.8% | 51 | 39.9% |
| Bond | 1,703 | UnitedHealth Group, Inc. | 48.9% | 51 | 42.4% |
| Clark | 1,635 | CVS Health Corporation | 57.3% | 49 | 41.2% |
| Fayette | 1,614 | CVS Health Corporation | 53.7% | 51 | 33.8% |
| Menard | 1,573 | CVS Health Corporation | 67.8% | 50 | 49.5% |
| Shelby | 1,547 | CVS Health Corporation | 71.4% | 50 | 28.4% |
| Perry | 1,540 | CVS Health Corporation | 42.8% | 49 | 42.2% |
| Edgar | 1,523 | CVS Health Corporation | 44.5% | 51 | 34.1% |
| De Witt | 1,490 | CVS Health Corporation | 50.6% | 50 | 40.5% |
| Warren | 1,395 | CVS Health Corporation | 32.8% | 50 | 36.5% |
| Mason | 1,334 | CVS Health Corporation | 55.2% | 49 | 38.8% |
| Johnson | 1,260 | CVS Health Corporation | 67.7% | 49 | 41.0% |
| Hancock | 1,226 | UnitedHealth Group, Inc. | 31.6% | 49 | 27.6% |
| Marshall | 1,135 | Humana Inc. | 41.5% | 49 | 37.0% |
| Pike | 1,099 | CVS Health Corporation | 49.5% | 49 | 30.7% |
| Crawford | 1,090 | CVS Health Corporation | 55.6% | 49 | 22.3% |
| Massac | 1,076 | CVS Health Corporation | 43.4% | 49 | 27.4% |
| Greene | 1,045 | CVS Health Corporation | 53.3% | 50 | 36.4% |
| Ford | 1,033 | CVS Health Corporation | 63.6% | 49 | 36.9% |
| Cumberland | 1,030 | CVS Health Corporation | 77.9% | 49 | 40.1% |
| Richland | 1,021 | CVS Health Corporation | 51.2% | 49 | 27.7% |
| Cass | 1,005 | CVS Health Corporation | 62.7% | 50 | 38.7% |
| Moultrie | 1,003 | CVS Health Corporation | 76.8% | 50 | 31.9% |
| White | 968 | CVS Health Corporation | 44.5% | 49 | 26.9% |
| Washington | 913 | UnitedHealth Group, Inc. | 49.4% | 51 | 29.3% |
| Wayne | 855 | CVS Health Corporation | 49.0% | 50 | 22.3% |
| Lawrence | 772 | CVS Health Corporation | 46.9% | 49 | 22.2% |
| Clay | 697 | CVS Health Corporation | 69.3% | 50 | 23.7% |
| Alexander | 657 | UnitedHealth Group, Inc. | 52.2% | 49 | 43.2% |
| Jasper | 571 | CVS Health Corporation | 72.3% | 49 | 27.2% |
| Schuyler | 552 | CVS Health Corporation | 72.5% | 49 | 34.5% |
| Henderson | 551 | UnitedHealth Group, Inc. | 43.6% | 49 | 34.4% |
| Pulaski | 514 | CVS Health Corporation | 53.5% | 49 | 37.5% |
| Hamilton | 491 | CVS Health Corporation | 57.0% | 49 | 29.9% |
| Wabash | 456 | CVS Health Corporation | 57.9% | 49 | 21.2% |
| Stark | 454 | CVS Health Corporation | 40.5% | 49 | 37.4% |
| Putnam | 401 | CVS Health Corporation | 51.4% | 49 | 30.7% |
| Calhoun | 372 | UnitedHealth Group, Inc. | 48.4% | 50 | 35.8% |
| Scott | 357 | CVS Health Corporation | 81.0% | 50 | 36.4% |
| Brown | 304 | CVS Health Corporation | 77.3% | 49 | 37.4% |
| Pope | 294 | CVS Health Corporation | 71.1% | 49 | 34.5% |
| Gallatin | 288 | CVS Health Corporation | 51.4% | 49 | 33.0% |
| Edwards | 246 | CVS Health Corporation | 60.2% | 49 | 19.7% |
| Hardin | 220 | CVS Health Corporation | 70.0% | 49 | 29.4% |
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).