The coding defect of Pedicle screw internal fixation is due to the lack of clinical knowledge of the coders and should be omitted or coded to 84.82 for different purposes; the coding defect of laparoscopic radical rectal surgery is due to the misuse of residual categories, the coding defect of Transcranial thrombectomy is because the coding is not specific and should be coded according to the specific Anatomic site The coding defect of Lobectomy with lymphadenectomy is that the coder relies too much on the computer dictionary and should code according to the actual operation.