Final answer:
ICD-10 codes are used for classification of diseases and related health problems, ranging from 3 to a maximum of 7 characters in length, providing specificity in documentation.
Step-by-step explanation:
The number of characters in an ICD-10 code ranges from 3 to 7. The International Classification of Diseases, Tenth Revision (ICD-10), uses codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or disease. Each ICD-10 code can have a minimum of three characters and a maximum of seven, allowing for a high level of specificity.