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.
Arizona
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 (%) |
|---|---|---|---|---|
| Arizona | 2015 | 143,674 | 366,878 | 39 |
| Arizona | 2016 | 158,433 | 331,949 | 48 |
| Arizona | 2017 | 136,797 | 228,545 | 60 |
| Arizona | 2018 | 138,454 | 208,328 | 66 |
| Arizona | 2019 | 133,879 | 192,261 | 70 |
| Arizona | 2020 | 134,007 | 184,662 | 73 |
| Arizona | 2021 | 151,199 | 197,250 | 77 |
| Arizona | 2022 | 181,639 | 222,532 | 82 |
- 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.