ICD-10 Code C72.50 – Malignant neoplasm of unspecified cranial nerve (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C72.50 – Malignant neoplasm of unspecified cranial nerve
What it is
This code identifies a malignant tumor involving a cranial nerve, but the specific nerve is not named in the record. Use it when the documentation confirms cancer of a cranial nerve and no more precise site is available.
Clinical signs
Clinical features vary; refer to documentation. Cranial nerve tumors may present with focal neurologic deficits such as pain, numbness, weakness, or changes in vision, hearing, speech, or swallowing, depending on the nerve involved.
When to use this code
Use this code when the provider documents a malignant neoplasm of a cranial nerve without identifying which nerve is affected. It is also appropriate when the record supports a cranial nerve primary site but the exact nerve cannot be determined from available documentation.
If later notes specify the nerve, you should code the more precise malignant neoplasm code instead. Check documentation when the chart uses vague terms such as “cranial nerve tumor” or “nerve sheath malignancy.”
Do not use for
Do not use this code for benign cranial nerve tumors, metastatic disease to a cranial nerve, or lesions that are not documented as malignant. If the exact cranial nerve is named, use the specific code.
Coding tip
Confirm whether the tumor is primary to the cranial nerve and whether a more specific nerve designation is available before assigning C72.50.