2026 ICD-10-CM Diagnosis Code C71.6Malignant neoplasm of cerebellum

ICD-10-CM Codes›C00–D49›C69-C72›C71

ICD-10-CM C71.6
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C71.6 is a billable ICD-10-CM diagnosis code for malignant neoplasm of cerebellum. 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

ICD-10-CM Code
C71.6
Billable Status
Yes — Valid for Submission
Code Describes
Malignant neoplasm of cerebellum
Short Description
Malignant neoplasm of cerebellum
Same as the full description in the CMS dataset.
Parent Code
C71
Malignant neoplasm of brain

Code Classification

ChapterC00–D49Neoplasms
SectionC69-C72Malignant neoplasms of eye, brain and other parts of central nervous system
CategoryC71Malignant neoplasm of brain
This CodeC71.6Malignant neoplasm of cerebellum

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cerebellopontine angle tumor
  • Classic medulloblastoma
  • Low grade glioma of cerebellum
  • Malignant glioma of cerebellum
  • Malignant neoplasm of cerebellopontine angle
  • Malignant neoplasm of cerebellum
  • Malignant neoplasm of pons
  • Medulloblastoma
  • Medulloblastoma of cerebellum
  • Primary classic medulloblastoma
  • Primary glioblastoma multiforme of brain
  • Primary glioblastoma multiforme of cerebellum
  • Primary malignant glioma of cerebellum
  • Primary malignant neoplasm of cerebellum
  • Primary medulloblastoma
  • Primary medulloblastoma of cerebellum

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Medulloblastoma
      • desmoplastic
    • Medulloblastoma
      • unspecified site
    • Medullomyoblastoma
      • unspecified site
    • Sarcoma(of)
      • cerebellar
    • Sarcoma(of)
      • cerebellar
        • circumscribed (arachnoidal)
    • Sarcoma(of)
      • circumscribed (arachnoidal) cerebellar

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO048
Nervous system cancers - brain
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Medulloblastoma

    a malignant neoplasm that may be classified either as a glioma or as a primitive neuroectodermal tumor of childhood (see neuroectodermal tumor, primitive). the tumor occurs most frequently in the first decade of life with the most typical location being the cerebellar vermis. histologic features include a high degree of cellularity, frequent mitotic figures, and a tendency for the cells to organize into sheets or form rosettes. medulloblastoma have a high propensity to spread throughout the craniospinal intradural axis. (from devita et al., cancer: principles and practice of oncology, 5th ed, pp2060-1)

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
brain NEC › cerebellopontine angleC71.6C79.31–D33.1D43.1D49.6
brain NEC › cerebellum NOSC71.6C79.31–D33.1D43.1D49.6
cerebellopontine (angle)C71.6C79.31–D33.1D43.1D49.6
cerebellum, cerebellarC71.6C79.31–D33.1D43.1D49.6
vermis, cerebellumC71.6C79.31–D33.1D43.1D49.6

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 C71.6 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
191.6 Mal neo cerebellum NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C71.6Overview

Is C71.6 (Malignant neoplasm of brain) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of cerebellum on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of C71.6?

Under the General Equivalence Mappings, malignant neoplasm of cerebellum converts to ICD-9-CM 191.6 (mal neo cerebellum NOS). 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.