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.
Tennessee
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 (%) |
|---|---|---|---|---|
| Tennessee | 2015 | 166,546 | 384,536 | 43 |
| Tennessee | 2016 | 204,366 | 376,865 | 54 |
| Tennessee | 2017 | 187,988 | 292,098 | 64 |
| Tennessee | 2018 | 192,061 | 255,781 | 75 |
| Tennessee | 2019 | 172,823 | 227,477 | 76 |
| Tennessee | 2020 | 176,649 | 226,049 | 78 |
| Tennessee | 2021 | 206,833 | 252,744 | 82 |
| Tennessee | 2022 | 253,944 | 295,568 | 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.