ICD-10 Code C71.1 – Malignant neoplasm of frontal lobe (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C71.1 – Malignant neoplasm of frontal lobe
What it is
This code identifies a malignant brain tumor arising in the frontal lobe. Use it when the documentation specifies a primary cancer in that brain region.
Clinical signs
Clinical features vary; refer to documentation. Frontal lobe tumors may present with personality or behavior changes, weakness, speech difficulty, seizures, or increased intracranial pressure.
When to use this code
Use C71.1 when the provider documents a malignant neoplasm of the frontal lobe, including a confirmed primary tumor in that location. Code it from imaging, pathology, or operative documentation if the site is clearly stated. Check documentation if the record only says “brain tumor” or does not specify the lobe.
Do not use for
Do not use this code for benign brain tumors, metastatic disease to the frontal lobe, or uncertain brain masses without malignant confirmation. If the site is not frontal lobe, choose the documented location.
Coding tip
Verify whether the tumor is primary or metastatic and ensure the frontal lobe site is explicitly documented before assigning C71.1.