Final answer:
In ICD-10-CM, brackets are not used to enclose supplementary words; they are instead used for synonyms and explanatory phrases. Parentheses are typically employed for supplementary words.
Step-by-step explanation:
The statement about ICD-10-CM manual stating that brackets [] are used to enclose supplementary words is false. In fact, brackets are typically used to enclose synonyms, alternate wording, or explanatory phrases in the Tabular List of diseases and injuries. For example, the word "influenza" might be followed by the word "flu" in brackets to indicate that it's an alternate term. It's important to understand and correctly interpret these notations for accurate medical coding and reporting. In contrast, parentheses () are more commonly used to enclose supplementary words that can help provide additional clarification for coding purposes.