Why is there only a medical insurance card but no social security card? make no difference

There is only a medical insurance card because the social security book was not collected by the social security bureau in time.

Insured persons who need to receive social security cards should hold their ID cards to receive social security cards, check them with their resident ID cards on the spot, and sign the receipt after verification.

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