Importance: Research in the early 2000s in California demonstrated that racial and ethnic minorities, immigrants, and those with limited English proficiency (LEP) experienced high rates of discrimination in health care. Less is known about how patients' perceptions of discrimination in health care have changed since then. Objective: To determine whether perceptions of discrimination in health care have changed overall and for specific vulnerable populations. Design, Setting, and Participants: This cross-sectional study used data from the California Health Interview Survey for state residents aged 18 years and older for 2 periods, 2003 to 2005 and 2015 to 2017. χ2 analyses and multivariate logistic regression were performed to compare recent discrimination in health care in late vs early periods controlling for race/ethnicity, poverty level, education, insurance status, usual source of care, self-reported health, and LEP. Additional subanalyses were performed by race/ethnicity, immigrant status, and LEP status. Jackknife replicate weights were provided by the California Health Interview Survey. Exposure: Survey year was dichotomized as combined 2003 to 2005 and combined 2015 to 2017. Main Outcomes and Measures: Survey respondents were identified as having experienced recent discrimination in health care if they responded "yes" to the question, "Was there ever a time when you would have gotten better medical care if you had belonged to a different race or ethnic group?" and reported that this occurred within the last 5 years. Results: There were 84088 participants in 2003 to 2005 (51.0% female; 14.7% aged ≥65 years) and 63242 participants in 2015 to 2017 (51.1% female; 18.0% aged ≥65 years). Rates of recent discrimination in health care decreased from 6.0% to 4.0% (difference, 2.0%; 95% CI, 1.5%-2.5%; P <.001). In adjusted analyses, perceptions of discrimination in health care decreased in 2015 to 2017 compared with 2003 to 2005 (odds ratio [OR], 0.60; 95% CI, 0.53-0.68; P <.001). There was a significant race × period interaction for Latino individuals (OR, 0.58; 95% CI, 0.40-0.83; P =.003) but not for Asian individuals (OR, 0.76; 95% CI, 0.50-1.16; P =.20) or African American individuals (OR, 1.24; 95% CI, 0.76-2.02; P =.40). There was a significant immigrant status × period interaction (OR, 0.55; 95% CI, 0.44-0.69; P <.001) and LEP status × period interaction (OR, 0.67; 95% CI, 0.51-0.89; P <.001). Conclusions and Relevance: This study suggests that perceptions of discrimination in health care in California decreased between 2003 to 2005 and 2015 to 2017 among Latino individuals, immigrants, and those with LEP. African American participants reported consistently high rates of discrimination, indicating that interventions targeting health care discrimination are still necessary. © 2019 Schulson LB et al. JAMA Network Open.

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education vulnerable population perception immigrant Asian insurance poverty human ethnic group controlled study African American resident interview Young Adult cross-sectional study Hispanic California male female race Article major clinical study adult human experiment ethnicity medical care