1. Large medical insurance refers to employees who participate in basic medical insurance. If the medical expenses exceed the maximum payment limit of the overall fund within one year, they will enter large medical insurance.

2. In order to solve the medical expenses above the top line of basic medical insurance, a large medical assistance system was established. Anyone who participates in the basic medical insurance must pay a few dollars per month (according to local regulations) for large medical assistance and special management. The medical expenses incurred by the insured exceeding the maximum payment limit of the basic medical insurance social pooling fund shall be paid by the large medical assistance fund in proportion.

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