Is it okay to pay social security instead of medical insurance?

Of course. It is ok to pay only social security and not medical insurance. There are two ways for individuals to pay social security, one is urban and rural residents' medical insurance and urban and rural residents' old-age insurance, the other is flexible payment of old-age insurance and medical insurance, or only pension. Participating employees' social security shall be paid by the unit for employees. Usually it is impossible to pay social security separately without buying medical insurance for five insurances.