2026 ICD-10-CM Diagnosis Code C71.7Malignant neoplasm of brain stem
ICD-10-CM Codes›C00–D49›C69-C72›C71
- Billable — Valid for Submission
- Chronic Condition
C71.7 is a billable ICD-10-CM diagnosis code for malignant neoplasm of brain stem. 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.
- Astrocytoma of brain stem
- Diffuse intrinsic pontine glioma
- Ependymoma of brain stem
- Glioma of brainstem
- Low grade glioma of brainstem
- Malignant glioma of brainstem
- Malignant neoplasm of brainstem
- Malignant neoplasm of cerebral peduncle
- Malignant neoplasm of medulla oblongata
- Malignant neoplasm of midbrain
- Malignant neoplasm of pons
- Oligodendroglioma of brain
- Oligodendroglioma of brain stem
- Primary astrocytoma of brain stem
- Primary diffuse intrinsic pontine glioma
- Primary glioblastoma multiforme of brain
- Primary glioblastoma multiforme of brainstem
- Primary malignant astrocytoma of brain
- Primary malignant glioma of brainstem
- Primary malignant neoplasm of brain stem
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Malignant neoplasm of fourth cerebral ventricle
- Infratentorial malignant neoplasm NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Diffuse Intrinsic Pontine Glioma
a rare, aggressive brain tumor that forms in the glial cells in the pons.
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. |
|---|---|---|---|---|---|---|
| basis pedunculi | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| brain NEC › choroid plexus | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| brain NEC › medulla oblongata | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| brain NEC › midbrain | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| brain NEC › peduncle | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| brain NEC › pons | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| brain NEC › stem | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| brain NEC › ventricle (floor) › fourth | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| cerebrum, cerebral (cortex) (hemisphere) (white matter) › peduncle | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| cerebrum, cerebral (cortex) (hemisphere) (white matter) › ventricle › fourth | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| ependyma (brain) › fourth ventricle | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| medulla › oblongata | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| midbrain | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| olive (brain) | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| peduncle, cerebral | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| pons (varolii) | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| pyramid (brain) | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| spine, spinal (column) › bulb | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| stem, brain | C71.7 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| ventricle (cerebral) (floor) (lateral) (third) › fourth | C71.7 | C79.31 | – | D33.1 | D43.1 | 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 C71.7 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C71.7Overview
Is C71.7 (Malignant neoplasm of brain) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of brain stem on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What is the ICD-9 equivalent of C71.7?
Under the General Equivalence Mappings, malignant neoplasm of brain stem converts to ICD-9-CM 191.7 (mal neo brain stem). 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.
