Original
The ICD-10 code sets are not a simple update of the ICD-9 code set. The ICD-10 code sets have
fundamental changes in structure and concepts that make them very different from ICD-9. Because of
these differences, it is important to develop a preliminary understanding of the changes from ICD-9 to
ICD-10. This basic understanding of the differences will then identify more detailed training that will be
needed to appropriately use the ICD-10 code sets. In addition, seeing the differences between the code
sets will raise awareness of the complexities of converting to the ICD-10 codes.