| ICD-9 CM ( Codes) | ICD-10 CM ( Codes) |
| Consists of 3-5 digits | Consists of 3-7 characters |
| First digit is alpha or numeric (E or V) | First character is always alpha |
| Second-fifth digits are numeric | Second character is numeric |
| Limited space for adding new codes | Flexibility for adding new codes |
| Decimal placed after the first 3 digits | Decimal placed after the third character |
| Alpha characters are not case sensitive | Characters 3-7 can be alpha or numeric |
| 17,000 codes | Approximately 68,000 codes |
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