Code set differences
ICD-9-CM codes are very different than ICD-10-CM/PCS code sets:
- There are nearly 19 times as many procedure codes in ICD-10-PCS than in ICD-9-CM volume 3
- There are nearly 5 times as many diagnosis codes in ICD-10-CM than in ICD-9-CM
- ICD-10 has alphanumeric categories instead of numeric ones
- The order of some chapters have changed, some titles have been renamed, and conditions have been grouped differently
Figure 1
Key differences between ICD-9-CM and ICD-10-CM and ICD-10-PCS code sets.