2026 ICD-10-CM Diagnosis Code C71.5Malignant neoplasm of cerebral ventricle
ICD-10-CM Codes›C00–D49›C69-C72›C71
- Billable — Valid for Submission
- Chronic Condition
C71.5 is a billable ICD-10-CM diagnosis code for malignant neoplasm of cerebral ventricle. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system cancers - brain.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Choroid plexus carcinoma
- Increased cerebrospinal fluid production
- Increased cerebrospinal fluid production due to choroid plexus carcinoma
- Malignant neoplasm of choroid plexus
- Malignant neoplasm of floor of cerebral ventricle
- Malignant neoplasm of ventricle of brain
- Neoplasm of choroid plexus
- Primary astrocytoma of cerebral ventricle
- Primary choroid plexus carcinoma
- Primary ependymoma of brain ventricle
- Primary glioblastoma multiforme of brain
- Primary glioblastoma multiforme of cerebral ventricle
- Primary malignant astrocytoma of brain
- Primary malignant glioma of cerebral ventricle
- Primary malignant neoplasm of brain ventricle
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- malignant neoplasm of fourth cerebral ventricle C71.7
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Papilloma - See Also: Neoplasm, benign, by site;
- choroid plexus (lateral ventricle) (third ventricle) - D33.0
- anaplastic - C71.5
- malignant - C71.5
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Papilloma
- choroid plexus (lateral ventricle) (third ventricle)
- anaplastic
- Papilloma
- choroid plexus (lateral ventricle) (third ventricle)
- malignant
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| brain NEC › ventricle (floor) | C71.5 | C79.31 | – | D33.0 | D43.0 | D49.6 |
| cerebrum, cerebral (cortex) (hemisphere) (white matter) › ventricle | C71.5 | C79.31 | – | D33.0 | D43.0 | D49.6 |
| choroid › plexus | C71.5 | C79.31 | – | D33.0 | D43.0 | D49.6 |
| ependyma (brain) | C71.5 | C79.31 | – | D33.0 | D43.0 | D49.6 |
| plexus › choroid | C71.5 | C79.31 | – | D33.0 | D43.0 | D49.6 |
| ventricle (cerebral) (floor) (lateral) (third) | C71.5 | C79.31 | – | D33.0 | D43.0 | D49.6 |
Patient EducationClinical
Brain Tumors
A brain tumor is a growth of abnormal cells in the tissues of the brain. Brain tumors can be benign, with no cancer cells, or malignant, with cancer cells that grow quickly. Some are primary brain tumors, which start in the brain. Others are metastatic, and they start somewhere else in the body and move to the brain.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert C71.5 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C71.5Overview
Is C71.5 (Malignant neoplasm of brain) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of cerebral ventricle on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What is the ICD-9 equivalent of C71.5?
Under the General Equivalence Mappings, malignant neoplasm of cerebral ventricle converts to ICD-9-CM 191.5 (mal neo cereb ventricle). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
