According to the regulations of national health insurance, the cost of drug exchange in hospitals can be divided into small, medium, large and extra large drug exchange, and the standards and charges of different drug exchange are different. Small dressing change is applicable to incisions with a wound surface of less than 2cm and less than two stitches, and the general cost is 13 yuan; medium dressing change refers to incisions with a wound surface of less than 4cm and stitches of less than 5 stitches, and the cost is about 23 yuan; large dressing change refers to incisions with a wound surface of 5-10cm and stitches of less than 10 stitches, and the cost of dressing change is about 35 yuan; extra large dressing change refers to wounds with a wound surface of 10-15cm and stitches of 15 stitches or less, the cost of dressing change will be about 45 RMB. If the patient needs to remove the stitches, the cost of stitch removal and the cost of medication change are charged separately, so if the patient goes to the hospital to change the medication and remove the stitches, both the stitch removal and medication change fees are charged.