Final answer:
Not all ICD-10-CM codes have seven characters. They can vary from three to seven characters, with seven characters being used only when the highest level of specificity is needed for a condition.
Step-by-step explanation:
No, not all ICD-10-CM codes have seven characters. The answer to the student's question is 2) False. ICD-10-CM (International Classification of Diseases, 10th Revision, Clinical Modification) codes are alphanumeric and can vary in length from three to seven characters.
The codes are structured with a category followed by etiology, anatomic site, severity, or other clinical detail. For certain conditions, a full seven-character code is required to provide the highest level of specificity. However, not all conditions require this level of detail, and in those cases, fewer than seven characters are used for coding.