C71.8
BillableMalignant neoplasm of overlapping sites of brain
HCC Category Mapping
V28HCC 20 — Lung and Other Severe Cancers
0.000V24HCC 10 — Lymphoma and Other Cancers
0.675ESRDHCC 10 — Lymphoma and Other Cancers
0.000RxHCCHCC 22 — Cancer, Other Specified Sites
0.000What This Code Means
Cancer of the brain that involves multiple overlapping areas or sites within the brain. This code is used when the tumor crosses boundaries between different brain regions.
Coding Tips
- •Use this code only when the tumor clearly involves more than one distinct brain region
- •Document all involved sites in the medical record for clarity and treatment planning
Clinical Significance
Overlapping sites of brain cancer indicates a tumor that crosses boundaries between two or more distinct brain regions, typically reflecting a large or diffusely infiltrating tumor such as butterfly glioblastoma (crossing the corpus callosum) or multifocal brain cancer. These presentations are associated with worse prognosis and more limited surgical options.
Documentation Requirements
- ✓Pathology confirming malignancy with histological type and grade
- ✓MRI documenting involvement of two or more distinct brain regions
- ✓Documentation of which specific brain regions are involved
- ✓Assessment of functional deficits reflecting multi-regional involvement
- ✓Treatment plan addressing the diffuse nature of the disease
Commonly Confused Codes
C71.0-C71.7 — Specific brain region codes: use overlapping code only when tumor clearly involves multiple regions; if one primary region predominates, code that regionC71.9 — Brain, unspecified: overlapping means multiple known sites; unspecified means the site is unknownC79.31 — Brain metastasis: multifocal brain metastases from systemic cancer should not be coded as primary overlapping brain cancerC71.0 — Cerebrum except lobes: consider this code for deep central tumors that do not specifically cross lobar boundaries
Code Hierarchy
└C71Malignant neoplasm of brain└C71.8Malignant neoplasm of overlapping sites of brain
└C71.8Malignant neoplasm of overlapping sites of brain