California has made major strides in reducing the number of state residents without health insurance coverage. With the state’s Medicaid expansion and the creation of Covered California under the Affordable Care Act (ACA), the percentage of Californians without insurance dropped nearly 5 percentage points in 2014—the first year of ACA implementation. Declines occurred across all racial and ethnic groups, with Latinos registering the largest drop at 9 percentage points. Nevertheless, Latinos continue to experience the highest uninsured rate, in part because the ACA coverage expansions exclude California’s estimated 2.7 million undocumented immigrants.
But there is more to the story of insurance coverage and California’s immigrants: we also observe large declines in the uninsured rate among all noncitizens, a group that includes an estimated 2.6 million people who are legally residing in the state (with green cards, temporary visas, work visas, etc.), as well as those who are undocumented. When we look at uninsured rates across different citizenship categories, we see the drop was larger among noncitizens than among US-born and naturalized citizens—noncitizens had nearly a nine percentage point decline in their uninsured rate.
Noncitizens who legally reside in the state have access to ACA coverage expansions either through the Medi-Cal program—if their household income is below 138 percent of the federal poverty level, about $33,500 for a family of four—or through Covered California, with financial assistance available to help pay for coverage. Still, about 35% of California’s more than five million noncitizen residents currently lack comprehensive health insurance coverage—most are likely to be undocumented, with limited sources for affordable insurance coverage.
Undocumented residents sometimes have private health insurance, most often through their employers. National estimates suggest between 30–40% of undocumented immigrants have coverage. This number could grow if federal immigration reforms are implemented, by providing undocumented immigrants who qualify (between 1.1 and 1.3 million in California) with work permits and better job opportunities that could offer increased access to employment-based insurance.
Along with pending federal action on immigration reform, state legislative proposals are also focusing on expanding affordable insurance coverage options to the undocumented. In our new report, we discuss these potential options and provide new regional estimates of the undocumented population in California by income thresholds to assist policymakers in planning for potential coverage expansions to this group.

The percentage of Californians without health insurance coverage dropped nearly 5 points in the first year the Affordable Care Act (ACA) was implemented—from 17.2% to 12.4%. Declines were even more dramatic among adults age 18 to 64, who benefited the most from the ACA coverage expansions. Among this group, uninsurance rates declined nearly 7 percentage points—from about 24% in 2013 to about 17.3% in 2014.
Changes in uninsurance rates also varied across California counties. The largest declines were in parts of the Central Valley and Monterey County, where the percentage of residents without insurance dropped by more than 6%. The counties that experienced the largest declines include Stanislaus (8.5%), Monterey (6.7%), and Merced (6.4%). Los Angeles County, home to the largest number of residents without health insurance in the state, had more than half a million fewer residents reporting they were uninsured in 2014 than in 2013. Generally, counties with higher shares of uninsured residents in 2013 experienced the largest declines.
Before implementation of the ACA, the uninsured relied on EDs for care more than those with private insurance but
The proportion of ED visits involving moderate and low urgency continued its recent downward trend in 2014. And there was no discernable change in the proportion of ED visits that required patients to be admitted to the hospital.
Regardless of the outcome of this special session, the state faces the challenge of establishing a stable and sustainable state funding base for Medi-Cal, which now covers nearly one-third of the state population. Since Medi-Cal expanded under the Affordable Care Act (ACA) less than two years ago, enrollment has increased by nearly 40 percent, and about 12 million Californians are now covered. Nearly all new enrollees are in Medi-Cal managed care, which has also grown considerably over the past few years. The federal government is providing most of the financing for Medi-Cal expansion, but there is uncertainty about state costs in future years.
But the state will assume responsibility for 5 percent of costs for the newly eligible in 2017, and this share will gradually increase to 10 percent in 2020 and thereafter. Based on cost estimates for the newly eligible from the current state budget, this amounts to an additional $700M in 2017 and $1.4B in 2020. And this estimate doesn’t account for any increases in health care costs.
Statewide, our preliminary estimates indicate that just over half of undocumented immigrants (51%) are likely to be under the 138% poverty threshold used for Medi-Cal income eligibility. This share varies widely across regions. Nearly 60% in Los Angeles County and the Central Valley have incomes below the 138% threshold. Most Bay Area counties have lower shares below this threshold—from 36% in Santa Clara County to 44% in Contra Costa County. These findings are generally consistent with other work that uses different methods to profile California’s undocumented immigrants (
