The UC Berkeley Labor Center and UCLA Center for Health Policy Research created the California Simulation of Insurance Markets model to help California policymakers, advocates, and stakeholders project the impacts of the Affordable Care Act (ACA) on insurance coverage in California, particularly eligibility and enrollment in Medi-Cal, insurance through Covered California, and employer-based coverage, and who remains uninsured. Recently the model has been used to estimate the impact of state-based reforms to expand subsidies, reinstate the “individual mandate,” and expand eligibility for Medi-Cal coverage for undocumented young adults. CalSIM uses a wide range of official data sources, including the California Health Interview Survey.

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