ICD-10-CM Diagnosis Structure
ICD-9 CM |
ICD-10 CM |
Three to five characters in length |
Three to seven alphanumeric characters |
First digit is numeric but can be alpha (E or V) |
First character always alpha. All letters used except U |
Second, third, fourth & fifth digits are numeric |
Character number 2 is always numeric. Characters #3 - #7 can be alpha or numeric |
Decimal placed after the first three characters (or with E codes, placed after first four characters) |
Decimal placed after the first three characters |
Alpha characters are not case sensitive |
Alpha characters are not case sensitive |
Approximately 14,567 |
Approximately 69,832 |
Limited space for adding codes (Minimal) |
Flexible (Extensive) |
Laterality is lacking |
Laterality provides specificity |
Specificity is limited |
Specificity is extensive |
United States |
Most countries |
17 Chapters |
21 Chapters |
V and E codes are in supplemental classifications |
V and E supplemental classifications are incorporated into the main classification |
Included in the Nervous System |
Disease of Eyes and Ears are in their individual chapters |
Classifies injuries by type |
Groups injuries first by specific site (head, arm, leg, and such) and then by type of injury (fracture, open would, and the like) |
|
Postoperative complications have been moved to procedure-specific body system chapters |
Gout has been reclassified from the endocrine chapter in ICD-9-CM to the Musculoskeletal chapter in ICD-10-CM |
Certain diseases have been reclassified (or reassigned) to a more appropriate chapter to reflect current medical knowledge |
Refers back to fourth and fifth digits |
Includes full code titles for all codes |
|
Addition of a sixth character in some chapters |
|
Addition of code extensions (seventh character) for obstetrics, injuries and external causes of injury (Addition of placeholder – X) |