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.
Washington
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 (%) |
|---|---|---|---|---|
| Washington | 2015 | 142,427 | 325,387 | 44 |
| Washington | 2016 | 160,774 | 319,997 | 50 |
| Washington | 2017 | 178,566 | 298,455 | 60 |
| Washington | 2018 | 197,672 | 255,709 | 77 |
| Washington | 2019 | 186,816 | 232,597 | 80 |
| Washington | 2020 | 189,849 | 231,703 | 82 |
| Washington | 2021 | 207,285 | 246,608 | 84 |
| Washington | 2022 | 211,342 | 247,389 | 85 |
- 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.