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This paper aims at quantifying the importance of peer effects in the enrollment decisions of the New Cooperative Medical Scheme (NCMS) in rural China, by estimating a static model of games with incomplete information, in which rural households make the enrollment decisions based on their household and community characteristics as well as the others decisions from the same community. Using data from the China Health and Nutrition Survey (CHNS 2004-2009), we apply a two-step estimation method to estimate the model. Major findings indicate that a 10-percentage-point increase in the enrollment rate of other households in the same community increases ones take-up probability by 11.3 percent. We also find that the individual households take-up decision responds more strongly to the enrollment rates of higher socio-economic groups within the community than within-group effects, whereas peer effect from ones own demographic groups is larger than cross-group effects. Moreover, evidence suggests that peer effect in the NCMS enrollment is more influential for the decisions of low income families and rural residents living in relatively poor communities.