Our research attempted to investigate whether justice, trust in health care services, the confidence level of the health system and institutions, political party support and evaluation of health care services post- Jaminan Kesehatan Nasional (JKN) affected policy acceptability in our health workers (N=95) and laypeople (N=308) sample. We performed a two-level linear mixed-effects model to test our hypothesis that trust, perceived justice, confidence in healthcare services, and national health system evaluation could impact policy acceptability in our health workers and laypeople sample. We calculated the effect sizes by comparing level-2 variances and residuals of the null model and the random-intercept model. Our findings suggested that health care workers with high concern on justice would be more likely to hold negative acceptability to JKN. The findings implied that health workers tend to associate JKN with unfairness. On the other hand, JKN acceptability in laypeople sample was found to be positively associated with the evaluation of health care service post-JKN, while justice or political party support did not affect JKN acceptability. It might indicate that laypeople motives for joining JKN scheme could be essentially pragmatic. We administered our questionnaire using an online platform and circulated it through social media and IMS, so that this research poses a problem of self-selection bias, which potentially leads to biased estimates. We also oversampled female participants, especially in laypeople samples. Aiming at a universal health coverage in 2019, JKN will cover almost 300 million Indonesians and be one of the biggest single-payer national health insurance scheme in the world. Our research might offer insight into how health workers and laypeople respond to the policy.