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 Carolina
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 Carolina | 2015 | 152,424 | 254,407 | 60 |
| South Carolina | 2016 | 178,054 | 265,486 | 67 |
| South Carolina | 2017 | 171,162 | 241,909 | 71 |
| South Carolina | 2018 | 173,514 | 234,830 | 74 |
| South Carolina | 2019 | 178,516 | 232,341 | 77 |
| South Carolina | 2020 | 187,372 | 238,573 | 79 |
| South Carolina | 2021 | 225,734 | 277,010 | 81 |
| South Carolina | 2022 | 281,090 | 328,239 | 86 |
- 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.