What does NOS signify in ICD-10-CM coding?

In ICD-10-CM coding, NOS stands for "Not Otherwise Specified." This notation is used when there is insufficient detail in the medical documentation to assign a more specific code. It effectively allows coders to capture a diagnosis when the available information does not provide specifics that would lead to a more precise code.

For example, if a physician documents "chronic cough" without specifying the exact cause or type, the coder may assign a code that includes NOS to indicate that more specific information is not available. The use of NOS helps to maintain accuracy in coding while also acknowledging the limitations of the provided details.

The other terms presented do not align with ICD-10-CM coding terminology or standards. "Not overall standards," "Not ordered scan," and "Not optional syndrome" do not refer to recognized coding practices or definitions, making them irrelevant in the context of how NOS is utilized within the coding system.