According to the inquiry of the health department, the medical record coder is a job that needs continuous study and practice, and needs to master the classification and coding rules of diseases and operations, as well as the relevant knowledge of clinical medicine and statistics. It usually takes 3 to 5 years to become a qualified medical record coder, but it also depends on the individual's foundation, ability and hard work. If you want to take the International Examination of Disease Classification and Coding (ICD- 10), you need to have some basic medical knowledge and relevant knowledge of disease diagnosis, and be familiar with the rules of disease coding. You can attend some training courses provided by formal training institutions or websites, and you can also prepare for the exam by reading some professional books and materials.