We identified significant differences in access to care between White and Asian American non-elderly adults in California, a finding that persisted (1) in unadjusted and adjusted analyses and (2) in an aggregate Asian American group and when disaggregated by subgroup. Direction and magnitude of associations, however, varied, reflecting heterogeneity in the experiences of access to care across subgroups. Previous studies suggest significant associations between access to care and measures of acculturation, such as limited English proficiency, citizenship, and time spent in the USA and access to care.28, 31, 32 Our study builds upon this work by using contemporary data after ACA coverage expansions for five Asian subgroups. For some of our outcomes, disparities between Whites and Asian Americans—both aggregated and disaggregated—attenuated upon inclusion of acculturation factors. These findings, supported by previous studies, suggest that acculturation mediates the relationship between ethnicity and access to care.18, 20, 33 The impact of acculturation may vary by Asian subgroup, further supporting the importance of disaggregated analyses.
Uninsured
Before the ACA, Asian Americans reported higher uninsurance rates relative to White adults, a gap attributed in part to higher rates of employment in small businesses that did not offer health insurance benefits.34 Studies predating the ACA identified variation in the sociodemographic and acculturation-related characteristics associated with uninsurance across Asian American subgroups in California.17 Following the ACA, disparities in insurance coverage between White and Asian American respondents appear to have attenuated, perhaps reflecting targeted outreach—which relied on a network of hundreds of community organizations, churches, and small businesses—and availability of in-language assistance for enrollment in California’s marketplace, Covered California.15, 35, 36 In the first few months of the ACA implementation, more than 20% of new Covered California enrollees were of Asian descent. An estimated 57% of Chinese, 65% of Vietnamese, and 70% of Korean new enrollees in Covered California plans did so through insurance agents.37
Our results also suggest that, following the ACA, there was heterogeneity in the distribution of insurance types across Asian American subgroups, a finding consistent with a study using 2003 and 2005 CHIS data.17 In comparison with previous estimates using CHIS, we found that there were decreases in the proportion of Asian Americans (aggregated and disaggregated) who were uninsured, and there were increases in having individually purchased and public insurance in some subgroups following ACA implementation.
Usual Source of Care
In studies predating the ACA, Asian Americans in California were significantly less likely to have a usual source of care relative to Whites.19, 20 In the aggregate, our findings are consistent; however, we build upon these findings by disaggregating into five Asian American subgroups, wherein Korean respondents were significantly less likely to report having a usual source of care. A study using 2005 and 2009 CHIS data indicated Koreans were significantly less likely to report having a usual source of care relative to other Asian American subgroups, and this was attributed to higher rates of uninsurance. Our study suggests that, following the ACA, Koreans had similar rates of uninsurance relative to Whites, yet were still significantly less likely to report having a usual source of care. This finding persisted even after adjusting for predisposing, enabling, need, and acculturation factors. Vietnamese respondents were significantly less likely to report a usual source of care relative to White respondents; however, for Vietnamese respondents, the association was no longer significant after adjusting for predisposing factors.
Among those with a usual source of care, Asian Americans—specifically Chinese and Filipino respondents—were significantly more likely to go to a clinic or health center relative to Whites, which was consistent with previous studies.38 Differences in site of usual source of care among Asian Americans have previously been explained in part by attitudes and perceptions about discrimination in health care.38 That the site of care for some Asian American subgroups was a health center or clinic could reflect need for or availability of enabling services (e.g., on-site language interpretation services, transportation services, and culturally proficient care).11, 39
Delays in Necessary Medical Care and Prescription Drugs
Our finding that Asian Americans in the aggregate were significantly less likely to report delays in necessary medical care or prescription drugs is consistent with a recent analysis, which suggested that, following ACA implementation, Asian Americans were significantly less likely to report delaying necessary care specifically because of cost.10 Our disaggregated findings—wherein Chinese and Vietnamese respondents were significantly less likely to report delays in necessary medical care—align with a study preceding the ACA, and the authors suggested these findings reflect different cultural preferences and a more crisis-oriented perspective on access to care among Asian Americans.19 Our study builds upon this analysis by estimating the odds of delaying necessary care or prescription medication following the ACA, and by examining these outcomes for Japanese and Korean adults, who reported statistically comparable rates relative to their White peers.
State Policies in Disaggregation of Asian American Data
During the Obama administration, the White House Initiative on Asian Americans began to identify methods of collecting and reporting more detailed subgroup data in federal surveys.40 There has been more movement at the state level: a bill requiring disaggregated data collection passed the California State Assembly and was signed into law in 2016.41, 42 Similar legislation passed in New York and Massachusetts the following year. Some civil rights groups and lawmakers argue that the disaggregated information may provide further information on disparities in poverty, education, and health care that currently go unnoticed in a diverse group and can inform community needs.43, 44 Opponents of the legislation suggest that the policy unfairly targets only Asian Americans, and that there are potential unintended consequences in disaggregation, particularly in terms of education.45
Limitations
Our study did not estimate the causal impact of the Affordable Care Act on access to care for Asian Americans. The data in our study are limited to adults in California, and therefore our results may not be representative of outcomes in other states or nationwide. Notably, about 16% of the Californian population is Asian American, which is higher than the national average (6%).46 Moreover, some counties in California expanded Medicaid eligibility before 2014, which we are unable to account for in the data; nevertheless, the CHIS is one of the few publicly available data sources that has collected more granular Asian subgroup data for multiple years, and an estimated 31% of non-elderly Asian Americans in the USA reside in California.1, 47 Further, our sampling strategy excluded individuals who self-identified as Asian American but either identified as “Other Asian” or reported multiple subgroups, which prevented us from assessing further intra-racial heterogeneity. Examining access to care for multiracial populations is important for future studies. We ran sensitivity analyses to include respondents who reported multiple Asian ethnicities or identified as “Other Asian,” in our aggregate analyses, which did not change the significance or direction for most of our findings. Lastly, our models currently compare differences between non-Hispanic White and Asian American non-elderly adults, and it is possible that non-Hispanic White adults would not be the appropriate comparator group.48
Our findings identified critical differences in access to care between White and Asian American adults in California following the ACA, but these differences varied substantially among Asian American subgroups. These results suggest a potential benefit to collecting disaggregating data—particularly as it pertains to health care data—for Asian Americans, and can potentially inform more targeted public policy and program interventions to mitigate gaps in access to care.