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.
District of Columbia
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 (%) |
|---|---|---|---|---|
| District of Columbia | 2015 | 14,845 | 19,472 | 76 |
| District of Columbia | 2016 | 17,317 | 20,904 | 83 |
| District of Columbia | 2017 | 17,762 | 20,634 | 86 |
| District of Columbia | 2018 | 16,105 | 19,199 | 84 |
| District of Columbia | 2019 | 15,053 | 17,674 | 85 |
| District of Columbia | 2020 | 15,171 | 17,755 | 85 |
| District of Columbia | 2021 | 16,241 | 17,791 | 91 |
| District of Columbia | 2022 | 14,322 | 15,718 | 91 |
- 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.