ICD-10 Code C72.22 – Malignant neoplasm of left olfactory nerve (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C72.22 – Malignant neoplasm of left olfactory nerve
What it is
This code identifies a malignant tumor arising in the left olfactory nerve. It indicates cancer involving the nerve responsible for smell on the left side.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings may include reduced smell, nasal or frontal symptoms, or imaging evidence of a left olfactory nerve mass.
When to use this code
Use C72.22 when the provider documents a malignant neoplasm specifically involving the left olfactory nerve. It also applies when pathology, imaging, or operative notes clearly localize the primary malignancy to that nerve. Check documentation if laterality or primary site is unclear.
Do not use for
Do not use this code for benign tumors, metastatic disease to the nerve, or unspecified cranial nerve neoplasms. If the record does not confirm the left olfactory nerve, choose a more accurate code.
Coding tip
Verify both laterality and malignant behavior in the record before assigning C72.22.