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C71.9 — Malignant neoplasm of brain, unspecified
C71.9
What this code means
A tumour arising within the brain tissue itself.
Also called: brain cancer, brain tumour, brain tumor.
When this code is used
Used for malignant neoplasm of the brain when the exact site is not specified.
Where it sits in ICD-10-CM
Code C71.9 belongs to Chapter 2: Neoplasms, which covers codes C00–D49 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Learn more about this condition
Related symptoms
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code C71.9?
C71.9 is the ICD-10-CM diagnosis code for “Malignant neoplasm of brain, unspecified”. A tumour arising within the brain tissue itself.
When is code C71.9 used?
Used for malignant neoplasm of the brain when the exact site is not specified. It belongs to Chapter 2 of ICD-10-CM (Neoplasms).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.