Malignant neoplasm of unspecified olfactory nerve

This code signifies a cancerous tumor originating in the olfactory nerve, which is responsible for the sense of smell. It indicates that the specific type or location of the malignancy within the olfactory nerve has not been further specified in the medical record.

Apply this code when documentation confirms a primary malignant neoplasm of the olfactory nerve, but lacks further detail regarding its specific morphology or precise anatomical subsite. This is often used for initial diagnoses or when pathology reports are pending or inconclusive regarding further specificity.

• Avoid using this code if a more specific anatomical site within the olfactory nerve or a more definitive histological type of malignancy is documented.
• Always sequence this code as the primary diagnosis if it represents the reason for the encounter.
• Ensure documentation clearly states "malignant neoplasm" and "olfactory nerve" to support its use.