Parentheses are used to enclose supplementary words that may be present or absent in a statement of disease without affecting the code assignment.

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Parentheses are commonly used in ICD-10-CM to indicate supplementary information, such as manifestation codes, non-essential modifiers, or explanatory phrases, that do not change the code assignment but provide additional information about the diagnosis or condition. The presence or absence of the enclosed words or phrases should not affect the code selection.

Parentheses Are Used to Enclose Supplementary Words That May Be