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ICD-10-CM codes consist of 3-7 alphanumeric characters: Digit 1 is alpha. Digit 2 is numeric. Digits 3-7 are alpha or numeric (44) The expanded number of characters of the ICD-10 diagnosis codes provides greater specificity to identify disease etiology, anatomic site, and severity. ICD-10 Code Structure: Characters 1-3 – Category ................
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