It means that the base for medical insurance participants to pay medical insurance fees according to a certain proportion is 49.

according to public information, the current base of medical insurance payment in China is generally determined by my salary. If my total monthly salary exceeds 3% of the average monthly salary of employees in this city last year, I will pay 3% of the average monthly salary of employees in this city last year. If the total monthly salary is lower than 6% of the average monthly salary of employees in this Municipality last year, the payment shall be made according to 6% of the average monthly salary of employees in this Municipality last year. The base of medical insurance payment is 49, that is, the base of medical insurance participants paying medical insurance fees according to a certain proportion is 49.

medical insurance generally refers to basic medical insurance, which is a social insurance system established to compensate workers for economic losses caused by disease risks. The medical insurance fund is established through the payment of employers and individuals. After the insured person suffers from medical expenses, the medical insurance institution will give him some economic compensation.