CMS's own filing for South Dakota
Medicare Advantage Plans South Dakota: Medicare Advantage plans in South Dakota, by the numbers
What CMS published about Medicare enrollment in South Dakota: 5 of 5 measures filed for this state, each one a field of the state's own row with the date the file was read.
- figures published by CMS
- 5
- counts CMS withheld
- 0
- the day this file was read
- 2026-09-11
Where South Dakota sits among the states
37.4% of everyone with Medicare in South Dakota is in a Medicare Advantage or other health plan rather than Original Medicare. That puts South Dakota 39th of 51, between Iowa above it and Massachusetts below. Across the country the same figure runs from 62.8% in Michigan down to 3.0% in Alaska, so what counts as the ordinary choice depends on where a person lives, and this is what it is where they do.
Every measure CMS filed for South Dakota
| Measure | What CMS published | Source |
|---|---|---|
| People with Medicare | In 2025, 202,669 people were enrolled in Medicare in South Dakota. | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| In Medicare Advantage and other health plans | In 2025, 75,797 of them were in Medicare Advantage or another health plan rather than Original Medicare in South Dakota (37.4% of everyone with Medicare in South Dakota). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| In Original Medicare | In 2025, 126,873 stayed in Original Medicare in South Dakota (62.6% of everyone with Medicare in South Dakota). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| In a stand-alone Part D drug plan | In 2025, 109,035 bought drug coverage as a stand-alone Part D plan in South Dakota (53.8% of everyone with Medicare in South Dakota). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| Also covered by Medicaid | In 2025, 19,879 were covered by Medicaid as well as Medicare in South Dakota (9.8% of everyone with Medicare in South Dakota). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
A withheld figure means CMS did not publish the count, never that the count is zero.
Cite or embed this figure
South Dakota: 5 Medicare enrollment figures published by CMS and 0 counts withheld (Medicare Plan Comparison State Enrollment Index).
Cite as: "Medicare Plan Comparison State Enrollment Index: South Dakota", updated 2026-09-11, https://medicareplancomparison.com/states/south-dakota/.
Download the South Dakota figures (CSV), free to reuse with citation.