
1. Texas: 17.30 percent total uninsured
Change in uninsured rate between 2010 and 2017: -6.41 percent
2017 Children's uninsured rate/rank: 10.7 percent / 50
2017 Adults' uninsured rate/rank: 19.86 percent / 50
2017 Whites' uninsured rate/rank: 9.8 percent / 47
2017 Blacks' uninsured rate/rank: 15 percent / 47
2017 Hispanics' uninsured rate/rank: 26.9 percent / 44
2017 Low-income households' uninsured rate/rank: 25.17 percent / 50
2017 High-income households' uninsured rate/rank: 8 percent / 49
An estimated 638,000 people in Texas are in the coverage gap due to the state's refusal to expand Medicaid, according to healthinsurance.org. In 2017, lawmakers overwhelmingly approved legislation to create a temporary high-risk pool. While the law prevents the state from using the pool to expand Medicaid, the pool could be used to either directly insure people with pre-existing conditions in coverage separate from the private individual market, or to offset costs for private insurers so that people with pre-existing conditions could still obtain affordable private health insurance.

Here is a look at the 10 states with the highest uninsured rates—with a discussion on why they did or did not choose to expand Medicaid under the federal law. (Photo: Shutterstock)

10. North Carolina: 10.68 percent uninsured
Change in uninsured rate between 2010 and 2017, -6.09 percent
2017 Children's uninsured rate/rank: 4.8 percent / 29
2017 Adults' uninsured rate/rank: 12.56 percent / 42
2017 Whites' uninsured rate/rank: 7.8 percent / 38
2017 Blacks' uninsured rate/rank: 11 percent / 34
2017 Hispanics' uninsured rate/rank: 30.30 percent / 49
2017 Low-income households' uninsured rate/rank: 16.48 percent / 44
2017 High-income households' uninsured rate/rank: 4.1 percent / 32
North Carolina has not yet expanded Medicaid under the Affordable Care Act, but Gov. Roy Cooper, a Democrat who took office in 2017, began working to expand coverage as one of his first tasks, according to healthinsurance.org. State lawmakers have thus far blocked his efforts, but Cooper's first budget proposal called for the expansion of Medicaid and he continues to push for it.

9. South Carolina: 10.99 percent total uninsured
Change in uninsured rate between 2010 and 2017: -6.54 percent
2017 Children's uninsured rate/rank: 5.1 percent / 32
2017 Adults' uninsured rate/rank: 12.81 percent / 43
2017 Whites' uninsured rate/rank: 8.7 percent / 43
2017 Blacks' uninsured rate/rank: 12.3 percent / 39
2017 Hispanics' uninsured rate/rank: 30.1 percent / 48
2017 Low-income households' uninsured rate/rank: 16.22 percent /41
2017 High-income households' uninsured rate/rank: 4.7 percent / 37
South Carolina leadership's opposition to the ACA means the state has thus far refused to expand Medicaid, according to healthinsurance.org. Kaiser Family Foundation estimates that there are 92,000 people in the coverage gap.

8. Nevada: 11.23 percent total uninsured
Change in uninsured rate between 2010 and 2017: -11.39 percent
2017 Children's uninsured rate/rank: 8 percent / 46
2017 Adults' uninsured rate/rank: 12.26 percent / 40
2017 Whites' uninsured rate/rank: 7.1 percent / 35
2017 Blacks' uninsured rate/rank: 9.9 percent / 29
2017 Hispanics' uninsured rate/rank: 19.5 percent / 31
2017 Low-income households' uninsured rate/rank: 15.83 percent / 40
2017 High-income households' uninsured rate/rank: 7.1 percent / 48
Nevada is the only state with a Republican governor that ran its own exchange in 2014, and one of just a few where Medicaid was expanded, according to healthinsurance.org. Although Nevada continues to have a state-run exchange, they have been using HealthCare.gov for enrollment since 2015.
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7. Mississippi: 12.04 percent total uninsured
Change in uninsured rate between 2010 and 2017, -6.15 percent
2017 Children's uninsured rate/rank: 4.8 percent / 29
2017 Adults' uninsured rate/rank: 14.59 percent / 46
2017 Whites' uninsured rate/rank: 10 percent / 48
2017 Blacks' uninsured rate/rank: 13.7 percent / 44
2017 Hispanics' uninsured rate/rank: 29.6 percent / 46
2017 Low-income households' uninsured rate/rank: 16.43 percent / 42
2017 High-income households' uninsured rate/rank: 4.5 percent / 35
Mississippi has not accepted the ACA's federal funding to expand Medicaid, according to healthinsurance.org, and there are an estimated 99,000 people in the Medicaid coverage gap in Mississippi. The state has asked the federal government to approve a work requirement for some of the people who are already eligible for Medicaid.

6. Wyoming: 12.25 percent total uninsured
Change in uninsured rate between 2010 and 2017, -2.67 percent
2017 Children's uninsured rate/rank: 9.5 percent / 48
2017 Adults' uninsured rate/rank: 13.19 percent / 44
2017 Whites' uninsured rate/rank: 10.3 percent / 49
2017 Blacks' uninsured rate/rank: 22.6 percent / 50
2017 Hispanics' uninsured rate/rank: 25.2 percent / 41
2017 Low-income households' uninsured rate/rank: 18.08 percent / 46
2017 High=income households' uninsured rate/rank: 6.6 percent / 45
Wyoming hasn't embraced the Affordable Care Act—opting for a federally facilitated exchange and refusing to expand Medicaid, according to healthinsurance.org. But Governor Matt Mead, a Republican, has pushed for Medicaid expansion for several years, and regrets the fact that the state still hasn't expanded Medicaid.

5. Florida: 12.94 percent total uninsured
Change in uninsured rate between 2010 and 2017: -8.32 percent2017 Children's uninsured rate/rank: 7.3 percent / 41
2017 Adults' uninsured rate/rank: 14.49 percent / 45
2017 Whites' uninsured rate/rank: 9.4 percent / 44
2017 Blacks' uninsured rate/rank: 15.3 percent / 48
2017 Hispanics' uninsured rate/rank: 19.3 percent / 30
2017 Low-income households' uninsured rate/rank: 17.31 percent / 45
2017 High-income households' uninsured rate/rank: 6.7 percent / 46
While Florida has one of the highest uninsured rates in the country, it also leads the U.S. in terms of the number of people who sign up for health insurance in the state's exchange, according to healthinsurance.org. Despite Florida's huge enrollment numbers in individual market coverage, the state has refused to accept federal funding to expand Medicaid under the ACA. As a result, there are an estimated 384,000 Florida residents in the coverage gap.

4. Georgia: 13.43 percent total uninsured
Change in uninsured rate between 2010 and 2017: -6.27 percent2017 Children's uninsured rate/rank: 7.6 percent / 43
2017 Adults' uninsured rate/rank: 15.53 percent / 48
2017 Whites' uninsured rate/rank: 9.7 percent / 46
2017 Blacks' uninsured rate/rank: 13.6 percent / 43
2017 Hispanics' uninsured rate/rank: 33 percent / 50
2017 Low-income households' uninsured rate/rank: 20.33 percent / 49
2017 High-income households' uninsured rate/rank: 5.6 percent / 43
Most states that have successfully reduced their uninsured population through the Affordable Care Act have implemented a state-run or partnership exchange and/or expanded Medicaid. Georgia has done neither of these things, which is typically an indication of opposition to the ACA, according to healthinsurance.org. As such, 240,000 people with income below the poverty level are in the coverage gap.

3. Alaska: 13.66 percent total uninsured
Change in uninsured rate between 2010 and 2017: -6.2 percent
2017 Children's uninsured rate/rank: 9.6 percent / 49
2017 Adults' uninsured rate/rank: 15.15 percent / 47
2017 Whites' uninsured rate/rank: 9.6 percent / 45
2017 Blacks' uninsured rate/rank: 12.2 percent / 38
2017 Hispanics' uninsured rate/rank: 13.4 percent / 14
2017 Low-income households' uninsured rate/rank: 18.49 percent / 47
2017 High-income households' uninsured rate/rank: 10.5 percent / 50
Alaska expanded Medicaid in September 2015, nearly two years after many other states had implemented Medicaid expansion, according to healthinsurance.org. By December 2016, more than 25,000 people had gained coverage under Alaska's expanded Medicaid. The AHCA calls for Medicaid expansion to be frozen as of 2020, so enrollment would decline from that point forward. The bill also calls for Medicaid funding to switch from the current open-ended federal matching program to a per-capita allotment. This could leave states holding the bag (and low-income people ultimately losing their coverage) as Medicaid costs increase.
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2. Oklahoma: 14.16 percent total uninsured
Change in uninsured rate between 2010 and 2017: -4.7 percent
2017 Children's uninsured rate/rank: 8.1 percent / 47
2017 Adults' uninsured rate/rank: 16.35 percent / 49
2017 Whites' uninsured rate/rank: 10.5 percent / 50
2017 Blacks' uninsured rate/rank: 13.9 percent / 45
2017 Hispanics' uninsured rate/rank: 24.7 percent / 40
2017 Low-income households' uninsured rate/rank: 19.72 percent / 48
2017 High-income households' uninsured rate/rank: 7 percent / 47
Before the ACA was implemented, the uninsured rate in Oklahoma was 21.4 percent, making the state one of 14 that had more than a fifth of their population without health insurance in 2013, according to healthinsurance.org. The state has not embraced Obamacare and has not expanded Medicaid; however, incremental gains have been made. By late-2015, the percentage of uninsured in Oklahoma had dropped 4.9 percent to 16.5 percent—a percentage still well above the national average (11.7 percent).

1. Texas: 17.30 percent total uninsured
Change in uninsured rate between 2010 and 2017: -6.41 percent
2017 Children's uninsured rate/rank: 10.7 percent / 50
2017 Adults' uninsured rate/rank: 19.86 percent / 50
2017 Whites' uninsured rate/rank: 9.8 percent / 47
2017 Blacks' uninsured rate/rank: 15 percent / 47
2017 Hispanics' uninsured rate/rank: 26.9 percent / 44
2017 Low-income households' uninsured rate/rank: 25.17 percent / 50
2017 High-income households' uninsured rate/rank: 8 percent / 49
An estimated 638,000 people in Texas are in the coverage gap due to the state's refusal to expand Medicaid, according to healthinsurance.org. In 2017, lawmakers overwhelmingly approved legislation to create a temporary high-risk pool. While the law prevents the state from using the pool to expand Medicaid, the pool could be used to either directly insure people with pre-existing conditions in coverage separate from the private individual market, or to offset costs for private insurers so that people with pre-existing conditions could still obtain affordable private health insurance.

Here is a look at the 10 states with the highest uninsured rates—with a discussion on why they did or did not choose to expand Medicaid under the federal law. (Photo: Shutterstock)

10. North Carolina: 10.68 percent uninsured
Change in uninsured rate between 2010 and 2017, -6.09 percent
2017 Children's uninsured rate/rank: 4.8 percent / 29
2017 Adults' uninsured rate/rank: 12.56 percent / 42
2017 Whites' uninsured rate/rank: 7.8 percent / 38
2017 Blacks' uninsured rate/rank: 11 percent / 34
2017 Hispanics' uninsured rate/rank: 30.30 percent / 49
2017 Low-income households' uninsured rate/rank: 16.48 percent / 44
2017 High-income households' uninsured rate/rank: 4.1 percent / 32
North Carolina has not yet expanded Medicaid under the Affordable Care Act, but Gov. Roy Cooper, a Democrat who took office in 2017, began working to expand coverage as one of his first tasks, according to healthinsurance.org. State lawmakers have thus far blocked his efforts, but Cooper's first budget proposal called for the expansion of Medicaid and he continues to push for it.

9. South Carolina: 10.99 percent total uninsured
Change in uninsured rate between 2010 and 2017: -6.54 percent
2017 Children's uninsured rate/rank: 5.1 percent / 32
2017 Adults' uninsured rate/rank: 12.81 percent / 43
2017 Whites' uninsured rate/rank: 8.7 percent / 43
2017 Blacks' uninsured rate/rank: 12.3 percent / 39
2017 Hispanics' uninsured rate/rank: 30.1 percent / 48
2017 Low-income households' uninsured rate/rank: 16.22 percent /41
2017 High-income households' uninsured rate/rank: 4.7 percent / 37
South Carolina leadership's opposition to the ACA means the state has thus far refused to expand Medicaid, according to healthinsurance.org. Kaiser Family Foundation estimates that there are 92,000 people in the coverage gap.

8. Nevada: 11.23 percent total uninsured
Change in uninsured rate between 2010 and 2017: -11.39 percent
2017 Children's uninsured rate/rank: 8 percent / 46
2017 Adults' uninsured rate/rank: 12.26 percent / 40
2017 Whites' uninsured rate/rank: 7.1 percent / 35
2017 Blacks' uninsured rate/rank: 9.9 percent / 29
2017 Hispanics' uninsured rate/rank: 19.5 percent / 31
2017 Low-income households' uninsured rate/rank: 15.83 percent / 40
2017 High-income households' uninsured rate/rank: 7.1 percent / 48
Nevada is the only state with a Republican governor that ran its own exchange in 2014, and one of just a few where Medicaid was expanded, according to healthinsurance.org. Although Nevada continues to have a state-run exchange, they have been using HealthCare.gov for enrollment since 2015.
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7. Mississippi: 12.04 percent total uninsured
Change in uninsured rate between 2010 and 2017, -6.15 percent
2017 Children's uninsured rate/rank: 4.8 percent / 29
2017 Adults' uninsured rate/rank: 14.59 percent / 46
2017 Whites' uninsured rate/rank: 10 percent / 48
2017 Blacks' uninsured rate/rank: 13.7 percent / 44
2017 Hispanics' uninsured rate/rank: 29.6 percent / 46
2017 Low-income households' uninsured rate/rank: 16.43 percent / 42
2017 High-income households' uninsured rate/rank: 4.5 percent / 35
Mississippi has not accepted the ACA's federal funding to expand Medicaid, according to healthinsurance.org, and there are an estimated 99,000 people in the Medicaid coverage gap in Mississippi. The state has asked the federal government to approve a work requirement for some of the people who are already eligible for Medicaid.

6. Wyoming: 12.25 percent total uninsured
Change in uninsured rate between 2010 and 2017, -2.67 percent
2017 Children's uninsured rate/rank: 9.5 percent / 48
2017 Adults' uninsured rate/rank: 13.19 percent / 44
2017 Whites' uninsured rate/rank: 10.3 percent / 49
2017 Blacks' uninsured rate/rank: 22.6 percent / 50
2017 Hispanics' uninsured rate/rank: 25.2 percent / 41
2017 Low-income households' uninsured rate/rank: 18.08 percent / 46
2017 High=income households' uninsured rate/rank: 6.6 percent / 45
Wyoming hasn't embraced the Affordable Care Act—opting for a federally facilitated exchange and refusing to expand Medicaid, according to healthinsurance.org. But Governor Matt Mead, a Republican, has pushed for Medicaid expansion for several years, and regrets the fact that the state still hasn't expanded Medicaid.

5. Florida: 12.94 percent total uninsured
Change in uninsured rate between 2010 and 2017: -8.32 percent2017 Children's uninsured rate/rank: 7.3 percent / 41
2017 Adults' uninsured rate/rank: 14.49 percent / 45
2017 Whites' uninsured rate/rank: 9.4 percent / 44
2017 Blacks' uninsured rate/rank: 15.3 percent / 48
2017 Hispanics' uninsured rate/rank: 19.3 percent / 30
2017 Low-income households' uninsured rate/rank: 17.31 percent / 45
2017 High-income households' uninsured rate/rank: 6.7 percent / 46
While Florida has one of the highest uninsured rates in the country, it also leads the U.S. in terms of the number of people who sign up for health insurance in the state's exchange, according to healthinsurance.org. Despite Florida's huge enrollment numbers in individual market coverage, the state has refused to accept federal funding to expand Medicaid under the ACA. As a result, there are an estimated 384,000 Florida residents in the coverage gap.

4. Georgia: 13.43 percent total uninsured
Change in uninsured rate between 2010 and 2017: -6.27 percent2017 Children's uninsured rate/rank: 7.6 percent / 43
2017 Adults' uninsured rate/rank: 15.53 percent / 48
2017 Whites' uninsured rate/rank: 9.7 percent / 46
2017 Blacks' uninsured rate/rank: 13.6 percent / 43
2017 Hispanics' uninsured rate/rank: 33 percent / 50
2017 Low-income households' uninsured rate/rank: 20.33 percent / 49
2017 High-income households' uninsured rate/rank: 5.6 percent / 43
Most states that have successfully reduced their uninsured population through the Affordable Care Act have implemented a state-run or partnership exchange and/or expanded Medicaid. Georgia has done neither of these things, which is typically an indication of opposition to the ACA, according to healthinsurance.org. As such, 240,000 people with income below the poverty level are in the coverage gap.

3. Alaska: 13.66 percent total uninsured
Change in uninsured rate between 2010 and 2017: -6.2 percent
2017 Children's uninsured rate/rank: 9.6 percent / 49
2017 Adults' uninsured rate/rank: 15.15 percent / 47
2017 Whites' uninsured rate/rank: 9.6 percent / 45
2017 Blacks' uninsured rate/rank: 12.2 percent / 38
2017 Hispanics' uninsured rate/rank: 13.4 percent / 14
2017 Low-income households' uninsured rate/rank: 18.49 percent / 47
2017 High-income households' uninsured rate/rank: 10.5 percent / 50
Alaska expanded Medicaid in September 2015, nearly two years after many other states had implemented Medicaid expansion, according to healthinsurance.org. By December 2016, more than 25,000 people had gained coverage under Alaska's expanded Medicaid. The AHCA calls for Medicaid expansion to be frozen as of 2020, so enrollment would decline from that point forward. The bill also calls for Medicaid funding to switch from the current open-ended federal matching program to a per-capita allotment. This could leave states holding the bag (and low-income people ultimately losing their coverage) as Medicaid costs increase.
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2. Oklahoma: 14.16 percent total uninsured
Change in uninsured rate between 2010 and 2017: -4.7 percent
2017 Children's uninsured rate/rank: 8.1 percent / 47
2017 Adults' uninsured rate/rank: 16.35 percent / 49
2017 Whites' uninsured rate/rank: 10.5 percent / 50
2017 Blacks' uninsured rate/rank: 13.9 percent / 45
2017 Hispanics' uninsured rate/rank: 24.7 percent / 40
2017 Low-income households' uninsured rate/rank: 19.72 percent / 48
2017 High-income households' uninsured rate/rank: 7 percent / 47
Before the ACA was implemented, the uninsured rate in Oklahoma was 21.4 percent, making the state one of 14 that had more than a fifth of their population without health insurance in 2013, according to healthinsurance.org. The state has not embraced Obamacare and has not expanded Medicaid; however, incremental gains have been made. By late-2015, the percentage of uninsured in Oklahoma had dropped 4.9 percent to 16.5 percent—a percentage still well above the national average (11.7 percent).

1. Texas: 17.30 percent total uninsured
Change in uninsured rate between 2010 and 2017: -6.41 percent
2017 Children's uninsured rate/rank: 10.7 percent / 50
2017 Adults' uninsured rate/rank: 19.86 percent / 50
2017 Whites' uninsured rate/rank: 9.8 percent / 47
2017 Blacks' uninsured rate/rank: 15 percent / 47
2017 Hispanics' uninsured rate/rank: 26.9 percent / 44
2017 Low-income households' uninsured rate/rank: 25.17 percent / 50
2017 High-income households' uninsured rate/rank: 8 percent / 49
An estimated 638,000 people in Texas are in the coverage gap due to the state's refusal to expand Medicaid, according to healthinsurance.org. In 2017, lawmakers overwhelmingly approved legislation to create a temporary high-risk pool. While the law prevents the state from using the pool to expand Medicaid, the pool could be used to either directly insure people with pre-existing conditions in coverage separate from the private individual market, or to offset costs for private insurers so that people with pre-existing conditions could still obtain affordable private health insurance.
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Katie Kuehner-Hebert

Katie Kuehner-Hebert is a freelance writer based in Running Springs, Calif. She has more than three decades of journalism experience, with particular expertise in employee benefits and other human resource topics.