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Difference between ICD 9 – ICD 10



Difference Between ICD 9 - ICD 10
Basic Information about ICD 9: The United States Implemented ICD 9 in 1979. But most of the countries moved to ICD 10 several years ago, it’s time for United States medical history to reflect modern Medical terms. 

Difference between ICD 9 – ICD 10

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
ICD-9-CM Diagnosis Codes
ICD-10-CM Diagnosis Codes
No Laterality
Laterality –
Right or Left account for >40% of codes
3-5 digits
  • First digit is alpha (E or V) or numeric
  • Digits 2-5 are numeric
  • Decimal is placed after the third character
7 digits
  • Digit 1 is alpha; Digit 2 is numeric
  • Digits 3–7 are alpha or numeric
  • Decimal is placed after the third character
No placeholder characters
“X” placeholders
14,000 codes
69,000 codes to better capture specificity
Limited Severity Parameters
Extensive Severity Parameters
Limited Combination Codes1 type of Excludes Notes
Extensive Combination Codes to better capture complexity



2 types of Excludes Notes



 

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