Which note indicates that certain codes are incompatible for simultaneous use?

The "Excludes1" note in ICD-10-CM coding indicates that certain codes are incompatible for simultaneous use. This note serves as a warning to coders that when one code is applicable, the other is not, as they represent mutually exclusive conditions. For example, if a diagnosis falls under one code with an "Excludes1" note, using the second code could lead to incorrect coding practices and potentially inaccurate documentation of the patient's condition.

Understanding the purpose of the "Excludes1" note is essential for proper code assignment, ensuring that the coding reflects the correct diagnosis without overlap or contradiction. In contrast, other notes such as "Code first" provide additional instruction on the sequence of codes rather than indicating incompatibility, while "Other" and "Includes" notes offer additional information regarding related codes without addressing their simultaneous usage. Thus, identifying the correct application of these notes is crucial for accurate and compliant coding.