South Dakota Medicare Advantage 2027 changes: 10 plans leaving, 11 new
In 28 seconds, the 2027 Medicare Advantage picture in South Dakota as the CMS plan files draw it: 10 plans leaving, 11 changing, 11 new, and what to check before Dec. 7.
Medicare Advantage plans in your area are changing or leaving for 2027.
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By the numbers
How South Dakota's 2027 changes compare
Measured against its own 2026 lineup of Medicare Advantage plans, South Dakota is losing 37.0% of them, the 4th highest of the 48 states with 20 or more plans; nationally, counting each plan once, the figure is 20.6%. 22.2% of the state's 2026 plans continue into 2027 with no change in premium, drug deductible, plan type or name; the other 77.8% change or leave.
Plans are leaving in 66 of South Dakota's 66 counties — every county in the state.
South Dakota counts 72,636 people in Medicare Advantage, 0.2% of the national total.
The South Dakota counties losing the largest share of their plans
| County | 2026 plans | Leaving | Share |
|---|---|---|---|
| Campbell County | 18 | 15 | 83.3% |
| Corson County | 18 | 15 | 83.3% |
| Walworth County | 18 | 15 | 83.3% |
| Haakon County | 14 | 11 | 78.6% |
| Jackson County | 14 | 11 | 78.6% |
69.2% of the rated Medicare Advantage plans offered in South Dakota for 2027 come from contracts rated 4 stars or higher, against 60.0% nationwide.
Stand-alone drug plans (for people on Original Medicare) in the Upper Midwest and Northern Plains (Iowa, Minnesota, Montana, Nebraska, North Dakota, South Dakota, and Wyoming) Part D region, which includes South Dakota: 9 for 2027, down from 11 in 2026; 0 with a $0 monthly premium, as in 2026.
Sources: CMS MA Landscape Source Files, CY2026 and CY2027; CMS State/County MA Penetration; CMS 2027 Star Ratings; CMS Part D (PDP) Landscape Source Files, CY2026 and CY2027. Area-level counts; no plan is named or recommended.
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Program-level information only; no plan is recommended, no premium or benefit is quoted. Not connected with or endorsed by the U.S. government or the federal Medicare program.