Do you need a medical insurance card if you have a social security card?

If you already have a social security card, you don't need to apply for a medical insurance card, because the social security card already contains a medical insurance card. Even if you have two cards at the same time, you cannot reimburse them at the same time. If you want to improve your security, you can consider investing in a supportive commercial insurance.

Social security card is different from medical insurance card.

The medical insurance card has a single function, that is, it is used when seeing a doctor and buying medicine. In some areas, medical insurance cards are issued before social insurance cards are issued, and the functions of the original medical insurance cards are invalid after the social insurance cards are issued, which is excessive. Social security card is a multifunctional card, which contains all the functions of medical insurance card, as well as other social security and welfare including pension. Unemployment insurance, industrial injury insurance and maternity insurance.

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