Medical Coding Practice Test

Brackets [] are used in ICD-9-CM to enclose synonyms and alternative wordings in the index and tabular sections. This helps to clarify the meaning of a code and provides additional options for coding a specific diagnosis. The other options, while relevant to medical coding, are not specifically related to the use of brackets in ICD-9-CM. Options A and B may be used in documentation or coding guidelines, but they do not pertain to the specific use of brackets in ICD-9-CM. Option D may be a consideration in certain cases, but it is not the primary function of brackets in ICD-9-CM.