Malignant neoplasm of left olfactory nerve

This code identifies a primary malignant tumor originating in the left olfactory nerve. This rare type of cancer affects the nerve responsible for the sense of smell, potentially leading to anosmia or other neurological symptoms.

Use this code for documented cases of primary malignant neoplasm specifically affecting the left olfactory nerve. Supporting documentation should include pathology reports confirming malignancy and laterality, as well as imaging studies (e.g., MRI) localizing the tumor.

• Ensure laterality is clearly documented as "left"; if unspecified, an unspecified code would be more appropriate.
• Distinguish this from secondary malignancies or benign tumors of the olfactory nerve.
• Sequence this code as the primary diagnosis when it is the reason for the encounter.