What disease is not reimbursed by social security?

No, although general social security has medical insurance, medical insurance cannot be reimbursed when you are sick. Generally, we pay hospitalization medical insurance, and only when you are hospitalized will you be reimbursed, and it is not fully reported, but in proportion.

Outpatient service is not reimbursed unless there are some special chronic diseases that need long-term treatment. Normal minor illnesses such as colds, fever, cough and falls that do not require hospitalization will not be reimbursed.

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