Does rural cooperative medical care belong to social security? I think it is necessary to fill in social security when playing commercial insurance.

Hello! Belong to. The rural cooperative medical system is organized, guided and supported by the government, with farmers participating voluntarily, raising funds by individuals, collectives and the government in various ways, and taking serious illness as the main insurance, which is a part of the social security system.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.