Question: what are the key differences between icd-9-cm and icd-10-cm code structure?
Answer: 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.