Concentration in Health Insurance Markets
This interactive chart provides details on 1) enrollment in the overall individual market and the individual exchanges as measured by covered life-years, and 2) covered life-years in each state's individual exchange as a proportion of covered life-years in the overall individual market from 2015 through 2022.
South Dakota
Source: GAO analysis of data from the Centers for Medicare & Medicaid Services (CMS). | GAO-25-107194
The table below displays data for the selected state. Click here to download the data used in this graphic.
| State | Year | Covered life-years, individual exchange | Covered life-years, individual market | Individual exchange covered life-years as a proportion of overall individual market (%) |
|---|---|---|---|---|
| South Dakota | 2015 | 17,745 | 77,233 | 23 |
| South Dakota | 2016 | 22,896 | 72,592 | 32 |
| South Dakota | 2017 | 25,470 | 63,176 | 40 |
| South Dakota | 2018 | 26,113 | 57,046 | 46 |
| South Dakota | 2019 | 26,036 | 53,102 | 49 |
| South Dakota | 2020 | 27,351 | 51,567 | 53 |
| South Dakota | 2021 | 31,755 | 53,882 | 59 |
| South Dakota | 2022 | 39,621 | 58,588 | 68 |
- We calculated the size of each market from 2015 through 2022 using covered life-years that issuers reported to Centers for Medicare & Medicaid Services or states. This measure is calculated as the average number of lives insured each month in the reporting year. Rather than a point-in-time measurement, this measure accounts for changes in enrollment that occur throughout the year.
- Covered life-years is one of several ways to measure health insurance enrollment, so it may differ from other measures of market size.
- We rounded market share values of less than 0.5 percent to zero.