1. Serious illness fund: it is the expenditure specially used for serious illness medical expenses. The standard of serious illness fund is 60 yuan per employee per year, which is paid by individuals. It is generally used when hospitalized in designated medical insurance hospitals.

2. Serious illness fund is a kind of insurance in social security fund, including: endowment insurance (paid by units and individuals), medical insurance (paid by units and individuals), serious illness fund (paid by individuals), work injury fund (paid by units) and maternity fund (paid by units), commonly known as "five insurances".

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