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.
Michigan
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 (%) |
|---|---|---|---|---|
| Michigan | 2015 | 266,112 | 471,211 | 56 |
| Michigan | 2016 | 280,588 | 457,564 | 61 |
| Michigan | 2017 | 259,782 | 411,353 | 63 |
| Michigan | 2018 | 242,409 | 365,906 | 66 |
| Michigan | 2019 | 232,224 | 342,568 | 68 |
| Michigan | 2020 | 232,966 | 340,932 | 68 |
| Michigan | 2021 | 250,598 | 350,585 | 71 |
| Michigan | 2022 | 276,626 | 363,693 | 76 |
- 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.