C71.0

HCC Category Mapping

What This Code Means

Cancer of the main part of the brain (cerebrum) excluding specific lobes and ventricles. This code is used when the tumor location is not more specifically identified.

Coding Tips

• •Use this code only when the specific lobe cannot be determined; if lobe is documented, use more specific codes C71.1-C71.4
• •Document the laterality (left or right hemisphere) when available for better clinical specificity

Clinical Significance

Malignant neoplasm of the cerebrum (excluding specific lobes and ventricles) represents a primary brain cancer in the largest part of the brain when the specific lobe cannot be determined. Primary brain cancers including glioblastoma are among the most devastating malignancies, with aggressive treatment requirements and substantial impact on patient function and survival.

Documentation Requirements

• ✓Pathology confirming primary malignancy with histological type and World Health Organization grade (glioblastoma, astrocytoma, oligodendroglioma)
• ✓MRI brain documenting tumor location within the cerebrum
• ✓Documentation that a specific lobe could not be identified (tumor may span deep structures)
• ✓Molecular markers if available (IDH mutation, MGMT methylation, 1p/19q codeletion)
• ✓Current treatment status (active treatment, post-surgical, palliative)

Commonly Confused Codes