Free tool · public CMS data
South Dakota Medicare Advantage market share
In September 2026, 45,853 South Dakota Medicare beneficiaries were enrolled in a Medicare Advantage plan across 68 parent carriers and 66 counties, led by Medica Holding Company with 38.8% of counted enrollment.
Data month
September 2026
Advantage enrollees
45,853
-1.6% vs September 2025
Parent carriers
68
Advantage penetration
36.0%
CMS Medicare Monthly Enrollment, 2024
Carriers in South Dakota
CMS Monthly Enrollment by Contract/Plan/State/County (CPSC) · September 2026
| # | Parent organisation | Enrollees | Share | Counties | vs September 2025 |
|---|---|---|---|---|---|
| 1 | Medica Holding Company | 17,807 | 38.8% | 31 | +172.7% |
| 2 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 10,490 | 22.9% | 66 | -25.3% |
| 3 | UnitedHealth Group, Inc. | 7,255 | 15.8% | 66 | -38.8% |
| 4 | CVS Health Corporation | 5,368 | 11.7% | 66 | -27.8% |
| 5 | Sanford Health | 4,730 | 10.3% | 36 | +29.3% |
| 6 | Humana Inc. | 101 | 0.2% | 66 | -96.6% |
| 7 | Elevance Health, Inc. | 91 | 0.2% | 66 | -4.2% |
| 8 | Health Care Service Corporation | 11 | 0.0% | 66 | -8.3% |
| 9 | Alignment Healthcare USA, LLC | 0 | 0.0% | 66 | — |
| 10 | Allina Health and Aetna Insurance Holding Company | 0 | 0.0% | 66 | — |
| 11 | Aultman Health Foundation | 0 | 0.0% | 66 | — |
| 12 | Aware Integrated, Inc. | 0 | 0.0% | 66 | — |
| 13 | Baystate Health, Inc. | 0 | 0.0% | 66 | — |
| 14 | Blue Cross & Blue Shield of Rhode Island | 0 | 0.0% | 66 | — |
| 15 | Blue Cross and Blue Shield of Massachusetts, Inc. | 0 | 0.0% | 66 | — |
| 16 | Blue Cross Blue Shield of Arizona | 0 | 0.0% | 2 | — |
| 17 | Blue Cross Blue Shield of Kansas | 0 | 0.0% | 66 | — |
| 18 | Blue Cross Blue Shield of Nebraska | 0 | 0.0% | 66 | — |
| 19 | BlueCross BlueShield of Alabama | 0 | 0.0% | 66 | — |
| 20 | BlueCross BlueShield of South Carolina (BCBSSC) | 0 | 0.0% | 66 | — |
| 21 | BlueCross BlueShield of Tennessee | 0 | 0.0% | 66 | — |
| 22 | California Physicians' Service | 0 | 0.0% | 66 | -100.0% |
| 23 | Cambia Health Solutions, Inc. | 0 | 0.0% | 66 | — |
| 24 | CAPITAL BLUE CROSS | 0 | 0.0% | 66 | — |
| 25 | CareFirst, Inc. | 0 | 0.0% | 66 | — |
| 26 | Centene Corporation | 0 | 0.0% | 8 | — |
| 27 | Corewell Health | 0 | 0.0% | 66 | — |
| 28 | CuraCor Solutions Corp. | 0 | 0.0% | 66 | — |
| 29 | Curana Health Holdings, LLC | 0 | 0.0% | 1 | — |
| 30 | Devoted Health, Inc. | 0 | 0.0% | 2 | — |
| 31 | EmblemHealth, Inc. | 0 | 0.0% | 66 | — |
| 32 | Fallon Community Health Plan, Inc. | 0 | 0.0% | 66 | — |
| 33 | Fenyx Health Holdings, Inc. | 0 | 0.0% | 66 | — |
| 34 | Gemstone Holdings, Inc. | 0 | 0.0% | 1 | — |
| 35 | General Catalyst Group Management Holdings LP | 0 | 0.0% | 66 | — |
| 36 | Gold Kidney Health Plan | 0 | 0.0% | 1 | — |
| 37 | Guidewell Mutual Holding Corporation | 0 | 0.0% | 66 | — |
| 38 | Hawaii Medical Service Association | 0 | 0.0% | 66 | — |
| 39 | Healthfirst, Inc. | 0 | 0.0% | 66 | — |
| 40 | HealthPartners, Inc. | 0 | 0.0% | 43 | — |
| 41 | Henry Ford Health System | 0 | 0.0% | 66 | — |
| 42 | Highmark Health | 0 | 0.0% | 66 | — |
| 43 | Horizon Mutual Holdings, Inc | 0 | 0.0% | 66 | — |
| 44 | Imperial Health Plan of California | 0 | 0.0% | 1 | — |
| 45 | Independence Health Group, Inc. | 0 | 0.0% | 66 | — |
| 46 | Independent Health Association, Inc. | 0 | 0.0% | 66 | — |
| 47 | Kaiser Foundation Health Plan, Inc. | 0 | 0.0% | 10 | — |
| 48 | Lifetime Healthcare, Inc. | 0 | 0.0% | 66 | — |
| 49 | Longevity Health Founders, LLC | 0 | 0.0% | 1 | — |
| 50 | Louisiana Health Service & Indemnity Company | 0 | 0.0% | 66 | — |
| 51 | Martin's Point Health Care, Inc. | 0 | 0.0% | 66 | — |
| 52 | MEDICAL MUTUAL OF OHIO | 0 | 0.0% | 66 | — |
| 53 | Molina Healthcare, Inc. | 0 | 0.0% | 1 | — |
| 54 | MVP Health Care, Inc. | 0 | 0.0% | 66 | — |
| 55 | Network Health, Inc. | 0 | 0.0% | 66 | — |
| 56 | PacificSource | 0 | 0.0% | 1 | — |
| 57 | Presbyterian Healthcare Services | 0 | 0.0% | 2 | — |
| 58 | PrimeWest Rural MN Health Care Access Initiative | 0 | 0.0% | 1 | — |
| 59 | Providence St Joseph Health | 0 | 0.0% | 1 | — |
| 60 | SANTA CLARA COUNTY HEALTH AUTHORITY | 0 | 0.0% | 1 | — |
| 61 | SCAN Group | 0 | 0.0% | 6 | — |
| 62 | SNP Holdings, LLC | 0 | 0.0% | 1 | — |
| 63 | The Health Plan of West Virginia, Inc. | 0 | 0.0% | 66 | — |
| 64 | Thomas Jefferson University | 0 | 0.0% | 1 | — |
| 65 | Trinity Health Corporation | 0 | 0.0% | 2 | — |
| 66 | Universal Health Services, Inc. | 0 | 0.0% | 4 | — |
| 67 | UPMC Health System | 0 | 0.0% | 66 | — |
| 68 | USAble Mutual Insurance Company | 0 | 0.0% | 66 | — |
County view
Leading carrier and Advantage enrollment in each South Dakota county. Penetration is from CMS Medicare Monthly Enrollment, 2024.
| County | Advantage enrollees | Leading carrier | Leader share | Carriers | Penetration |
|---|---|---|---|---|---|
| Minnehaha | 9,716 | Sanford Health | 31.6% | 53 | 42.1% |
| Pennington | 9,111 | Medica Holding Company | 60.7% | 55 | 35.7% |
| Codington | 3,167 | Medica Holding Company | 91.8% | 49 | 51.8% |
| Lawrence | 2,880 | Medica Holding Company | 59.5% | 55 | 38.9% |
| Brookings | 2,619 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 43.5% | 49 | 39.0% |
| Lincoln | 2,611 | Sanford Health | 33.1% | 51 | 41.9% |
| Meade | 2,042 | Medica Holding Company | 65.9% | 48 | 36.7% |
| Davison | 1,798 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 43.3% | 47 | 38.1% |
| Butte | 1,100 | Medica Holding Company | 56.6% | 47 | 45.4% |
| Custer | 999 | Medica Holding Company | 63.9% | 50 | 33.8% |
| Union | 811 | CVS Health Corporation | 84.1% | 47 | 34.3% |
| Roberts | 742 | Medica Holding Company | 57.0% | 49 | 38.0% |
| Fall River | 702 | Medica Holding Company | 61.0% | 47 | 29.9% |
| Yankton | 613 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 41.3% | 48 | 34.8% |
| Hamlin | 562 | Medica Holding Company | 91.6% | 48 | 45.6% |
| Day | 523 | Medica Holding Company | 82.6% | 47 | 37.9% |
| Kingsbury | 439 | Medica Holding Company | 50.8% | 48 | 32.0% |
| Deuel | 436 | Medica Holding Company | 65.1% | 48 | 44.5% |
| Clark | 425 | Medica Holding Company | 72.9% | 48 | 53.9% |
| Spink | 423 | Medica Holding Company | 77.1% | 47 | 31.8% |
| Clay | 398 | CVS Health Corporation | 33.9% | 48 | 32.4% |
| Marshall | 368 | Medica Holding Company | 74.5% | 48 | 35.2% |
| Turner | 363 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 44.4% | 46 | 47.3% |
| Lake | 327 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 46.2% | 49 | 33.4% |
| Beadle | 320 | UnitedHealth Group, Inc. | 53.4% | 47 | 39.5% |
| McCook | 267 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 31.8% | 46 | 40.8% |
| Charles Mix | 251 | UnitedHealth Group, Inc. | 46.6% | 47 | 24.6% |
| Bon Homme | 196 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 38.3% | 47 | 32.9% |
| Brown | 195 | UnitedHealth Group, Inc. | 100.0% | 48 | 25.3% |
| Hutchinson | 194 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 43.3% | 47 | 39.1% |
| Sanborn | 178 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 49.4% | 47 | 33.6% |
| Moody | 168 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 56.0% | 46 | 33.0% |
| Hanson | 156 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 54.5% | 49 | 36.4% |
| Walworth | 142 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 49.3% | 46 | 20.9% |
| Douglas | 92 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 68.5% | 47 | 27.8% |
| Miner | 83 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 63.9% | 47 | 27.6% |
| Aurora | 55 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 100.0% | 46 | 31.2% |
| Dewey | 48 | UnitedHealth Group, Inc. | 100.0% | 47 | 15.2% |
| Jackson | 47 | UnitedHealth Group, Inc. | 70.2% | 48 | 24.6% |
| Edmunds | 45 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 100.0% | 46 | 23.3% |
| Corson | 44 | UnitedHealth Group, Inc. | 65.9% | 46 | 20.9% |
| Hughes | 40 | UnitedHealth Group, Inc. | 100.0% | 46 | 17.3% |
| Haakon | 31 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 100.0% | 46 | 12.8% |
| Brule | 28 | CVS Health Corporation | 100.0% | 46 | 28.0% |
| Harding | 18 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 100.0% | 46 | 17.8% |
| Perkins | 16 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 100.0% | 48 | 22.9% |
| McPherson | 14 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 100.0% | 46 | 27.4% |
| Jerauld | 13 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 100.0% | 45 | 23.9% |
| Ziebach | 13 | UnitedHealth Group, Inc. | 100.0% | 46 | 19.2% |
| Gregory | 12 | CVS Health Corporation | 100.0% | 47 | 21.9% |
| Hand | 12 | Sanford Health | 100.0% | 48 | 17.8% |
| Bennett | 0 | Alignment Healthcare USA, LLC | — | 47 | 11.2% |
| Buffalo | 0 | Alignment Healthcare USA, LLC | — | 46 | 6.6% |
| Campbell | 0 | Alignment Healthcare USA, LLC | — | 47 | 27.7% |
| Faulk | 0 | Alignment Healthcare USA, LLC | — | 46 | 26.0% |
| Grant | 0 | Alignment Healthcare USA, LLC | — | 47 | 52.5% |
| Hyde | 0 | Alignment Healthcare USA, LLC | — | 46 | 28.4% |
| Jones | 0 | Alignment Healthcare USA, LLC | — | 46 | 14.8% |
| Lyman | 0 | Alignment Healthcare USA, LLC | — | 47 | 19.1% |
| Mellette | 0 | Alignment Healthcare USA, LLC | — | 46 | 14.8% |
| Potter | 0 | Alignment Healthcare USA, LLC | — | 46 | 15.0% |
| Shannon | 0 | Alignment Healthcare USA, LLC | — | 46 | — |
| Stanley | 0 | Alignment Healthcare USA, LLC | — | 46 | 18.6% |
| Sully | 0 | Alignment Healthcare USA, LLC | — | 46 | 16.0% |
| Todd | 0 | Alignment Healthcare USA, LLC | — | 46 | 7.6% |
| Tripp | 0 | Alignment Healthcare USA, LLC | — | 47 | 16.6% |
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).