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.
Montana
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 (%) |
|---|---|---|---|---|
| Montana | 2015 | 44,924 | 81,536 | 55 |
| Montana | 2016 | 46,992 | 74,953 | 63 |
| Montana | 2017 | 43,954 | 61,500 | 71 |
| Montana | 2018 | 40,803 | 53,969 | 76 |
| Montana | 2019 | 39,314 | 49,530 | 79 |
| Montana | 2020 | 39,800 | 49,830 | 80 |
| Montana | 2021 | 42,511 | 52,709 | 81 |
| Montana | 2022 | 48,624 | 58,145 | 84 |
- 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.