2026 ICD-10-CM Diagnosis Code D43.1Neoplasm of uncertain behavior of brain, infratentorial
ICD-10-CM Codes›C00–D49›D37-D48›D43
- Billable — Valid for Submission
- Chronic Condition
D43.1 is a billable ICD-10-CM diagnosis code for neoplasm of uncertain behavior of brain, infratentorial. 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 Neoplasms of unspecified nature or uncertain behavior.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Cerebellar hemangioblastoma
- Cerebellar liponeurocytoma
- Hemangioblastoma of brainstem
- Hemangioblastoma of central nervous system
- Low grade glioma of cerebellum
- Neoplasm of uncertain behavior of brain stem
- Neoplasm of uncertain behavior of cerebellum
- Neoplasm of uncertain or unknown behavior of brain, infratentorial
- Pilocytic astrocytoma
- Pilocytic astrocytoma of cerebellum
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Neoplasm of uncertain behavior of brain stem
- Neoplasm of uncertain behavior of cerebellum
- Neoplasm of uncertain behavior of fourth ventricle
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.
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 › cerebellopontine angle | C71.6 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| brain NEC › cerebellum NOS | C71.6 | 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 |
| cerebellopontine (angle) | C71.6 | C79.31 | – | D33.1 | D43.1 | D49.6 |
| cerebellum, cerebellar | C71.6 | 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 |
| vermis, cerebellum | C71.6 | C79.31 | – | D33.1 | D43.1 | D49.6 |
Patient EducationClinical
Brain Diseases
Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.
Read the full article at MedlinePlus
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Convert D43.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D43.1Overview
Is D43.1 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neoplasm of uncertain behavior of brain, infratentorial on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What is the ICD-9 equivalent of D43.1?
Under the General Equivalence Mappings, neoplasm of uncertain behavior of brain, infratentorial converts to ICD-9-CM 237.5 (unc beh neo brain/spinal). The mapping is approximate, so confirm the match fits the documentation.
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.
