Which symbol is used in ICD-10-CM to indicate that a code can only be a manifestation?

In ICD-10-CM coding, parentheses are used to enclose supplementary words that may clarify the code but are not essential to its definition. This includes additional information that helps in understanding the context or specificity of the diagnosis but does not change the code assignment. In particular, when a code is classified as a manifestation, it indicates that the code is to be used in conjunction with another code that represents the underlying condition. Therefore, when you see a code enclosed in parentheses, it signifies that it is a manifestation and cannot stand alone.

For example, a manifestation code might describe the symptoms or complications arising from a primary condition. The use of parentheses in coding highlights that the manifestation itself isn't the primary diagnosis; rather, it relies on the primary condition to provide a complete clinical picture. Understanding this relationship is crucial in proper coding practices, as it ensures that care providers understand the need to always reference and apply the underlying condition when documenting patient encounters.