![]() A code that has an applicable 7 th character is considered invalid without the 7 th character. Codes that have applicable 7 th characters are still referred to as codes, not subcategories. The final level of subdivision is a code. That is, each level of subdivision after a category is a subcategory. Subcategories are either 4 or 5 characters. A three-character category that has no further subdivision is equivalent to a code. The ICD-10-CM Tabular List contains categories, subcategories and codes.Ĭharacters for categories, subcategories and codes may be either a letter or a number. ICD-10-CM Guidelines - Format and Structure: These 7 th character extensions are found predominantly in two chapters of the ICD-10-CM/PCS (International Classification of Diseases, 10 th Edition. and several of them are code extensions to distinguish between initial or. ![]() The seventh character is used to capture details such as episode of care extensions for injuries, fractures have their own seventh character system. One significant difference between ICD-9 and ICD-10 is the need to assign a 7 th character, also called a 7 th character extension, to codes in certain ICD-10-CM categories. The switch to the ICD-10 coding system may have been pushed back at least a. The seventh character is one of the most significant changes from ICD-9. The next three characters (characters three through six) correspond to the related etiology (i.e., the cause, set of causes, or manner of causation of a disease or condition), anatomic site, severity, or other vital clinical details. ![]() The first three characters of an ICD-10 code designate the category of the diagnosis.
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