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MA Enrollment Explorer / States / South Dakota

Medicare Advantage in South Dakota: enrollment, penetration and market share

73,154 people in South Dakota were enrolled in Medicare Advantage in October 2026. 35.1% of the state's 208,654 eligible Medicare beneficiaries are in Medicare Advantage, −2.3 pts since October 2025. Medica Holding Company is the largest parent organization with 59% of reported enrollment; 9 parent organizations have 11 or more members, and the market's HHI is 3,917 (highly concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in South Dakota changed by −4,552 (−6.1%).

35.1%MA penetration, October 2026
73KMA enrollees
9parent organizations (11+ members)
3,917HHI, highly concentrated
Open South Dakota on the market mapMSSP ACOs in South Dakota

Parent organizations in South Dakota

Parent organizationMembersChangeShareShare change
Medica Holding Company42,475+11,66158.9%+17.7 pts
Blue Cross Blue Shield of Michigan Mutual Ins. Co.10,586−3,75114.7%−4.5 pts
UnitedHealth Group, Inc.8,043−4,56511.1%−5.7 pts
CVS Health Corporation5,925−2,0318.2%−2.4 pts
Sanford Health4,864+1,0786.7%+1.7 pts
Humana Inc.151−3,1810.2%−4.2 pts
Elevance Health, Inc.94−20.1%+0.00 pts
Aware Integrated, Inc.13newunder 0.1%+0.02 pts
Health Care Service Corporation11−2under 0.1%−0.00 pts

Change and share change are since October 2025. Shares are of reported enrollment in the CMS State/County/Contract file.

Counties

CountyMA enrolleesPenetrationLeading parent
Minnehaha County17,69241.9%Medica Holding Company 44%
Pennington County9,28730.2%Medica Holding Company 60%
Lincoln County5,61046.1%Medica Holding Company 52%
Codington County3,23647.5%Medica Holding Company 90%
Lawrence County3,01035.1%Medica Holding Company 58%
Brookings County2,70444.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 42%
Brown County2,53329.1%Medica Holding Company 90%
Yankton County2,14435.4%Medica Holding Company 70%
Meade County2,11628.9%Medica Holding Company 65%
Davison County1,87338.3%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 42%
Beadle County1,72241.9%Medica Holding Company 80%
Union County1,28732.7%CVS Health Corporation 54%
Butte County1,14142.9%Medica Holding Company 56%
Grant County1,12753.9%Medica Holding Company 98%
Custer County1,07832.2%Medica Holding Company 60%
Turner County1,06551.2%Medica Holding Company 62%
Lake County1,00834.7%Medica Holding Company 62%
Hughes County80821.5%Medica Holding Company 92%
Clay County77733.4%Medica Holding Company 44%
Roberts County77432.6%Medica Holding Company 56%
Fall River County76626.3%Medica Holding Company 58%
Hutchinson County73637.3%Medica Holding Company 68%
McCook County63545.9%Medica Holding Company 53%
Bon Homme County60536.2%Medica Holding Company 60%
Hamlin County58445.8%Medica Holding Company 89%
Day County57634.5%Medica Holding Company 76%
Charles Mix County49224.5%Medica Holding Company 41%
Kingsbury County49232.0%Medica Holding Company 46%
Moody County49230.7%Medica Holding Company 57%
Deuel County48540.7%Medica Holding Company 60%
Clark County46449.7%Medica Holding Company 67%
Spink County44525.9%Medica Holding Company 74%
Marshall County39733.3%Medica Holding Company 70%
Brule County37233.3%Medica Holding Company 88%
Hanson County34331.8%Medica Holding Company 36%
Walworth County33522.0%Medica Holding Company 49%
Edmunds County25926.1%Medica Holding Company 82%
Gregory County24820.5%Medica Holding Company 87%
Douglas County23028.2%Medica Holding Company 48%
Miner County22433.9%Medica Holding Company 43%
Aurora County21932.0%Medica Holding Company 58%
Tripp County21915.4%Medica Holding Company 100%
Sanborn County20433.5%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 45%
Perkins County20323.6%Medica Holding Company 83%
McPherson County17524.8%Medica Holding Company 91%
Jerauld County16724.3%Medica Holding Company 78%
Stanley County16019.0%Medica Holding Company 100%
Faulk County14524.0%Medica Holding Company 100%
Lyman County14118.7%Medica Holding Company 100%
Hand County13815.4%Medica Holding Company 89%
Corson County12921.3%Medica Holding Company 39%
Campbell County12429.1%Medica Holding Company 90%
Jackson County11822.5%Medica Holding Company 50%
Hyde County11131.8%Medica Holding Company 100%
Potter County10614.7%Medica Holding Company 100%
Dewey County9410.5%UnitedHealth Group, Inc. 63%
Haakon County8916.6%Medica Holding Company 59%
Oglala Lakota County614.1%
Sully County6013.5%Medica Holding Company 100%
Todd County595.3%Medica Holding Company 100%
Bennett County5410.5%Medica Holding Company 100%
Harding County5416.6%Medica Holding Company 62%
Mellette County5414.4%Medica Holding Company 100%
Oglala Lakota County54n/aMedica Holding Company 100%
Jones County3915.1%Medica Holding Company 100%
Ziebach County3617.3%UnitedHealth Group, Inc. 100%
Buffalo County239.5%CVS Health Corporation 100%