How to make up for the broken medical insurance in Shanghai?

How to pay social security when Shanghai is broken?

Individuals can't make up the payment and can only wait until retirement. Those who are less than 15 years can continue to pay fees until the expiration.

If the enterprise fails to pay social security for its employees on time as required, it may be paid by the unit on its behalf.

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