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.
Iowa
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 (%) |
|---|---|---|---|---|
| Iowa | 2015 | 36,185 | 198,142 | 18 |
| Iowa | 2016 | 44,568 | 172,995 | 26 |
| Iowa | 2017 | 42,232 | 142,912 | 30 |
| Iowa | 2018 | 40,216 | 108,271 | 37 |
| Iowa | 2019 | 44,472 | 102,440 | 43 |
| Iowa | 2020 | 51,057 | 99,690 | 51 |
| Iowa | 2021 | 56,209 | 97,594 | 58 |
| Iowa | 2022 | 68,238 | 103,924 | 66 |
- 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.