The rule of paying back the employees' medical insurance retirement in Tongling City, Anhui Province is that after the insured goes through the retirement formalities, they can pay back the minimum payment period in one lump sum according to the policy (5% of the minimum payment base in Anhui Province is paid for one month), and then they are included in the overall fund, so that they can pay according to the standard of retirees and enjoy the medical insurance treatment for retirees.

As for the difference of 13 mentioned, if you are 45 years old and need to pay 5% of the minimum annual payment base in Anhui Province for one month, then the amount you need to pay is 13 times 5% times 12 (because there are 12 months in a year).