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ICD-10-CM 2027 diagnosis code

C71Malignant neoplasm of brain

Not billable — use a more specific code

C71 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C71

C71 is the ICD-10-CM diagnosis code for malignant neoplasm of brain. It belongs to block C69-C72 (malignant neoplasms of eye, brain and other parts of central nervous system) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: C71.0 (ventricles), C71.1 (lobe), C71.2 (lobe), C71.3 (lobe), C71.4 (lobe), C71.5 (ventricle), C71.6 (cerebellum), C71.7 (stem) and 2 more.

Don't report C71 together with the conditions in its Excludes1 note: malignant neoplasm of cranial nerves (C72.2-C72.5) and retrobulbar malignant neoplasm (C69.6-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under C71

Coding notes

Excludes1Not coded here — never report together with this code
  • malignant neoplasm of cranial nerves (C72.2-C72.5)
  • retrobulbar malignant neoplasm (C69.6-)

Notes that apply from higher levels

Instructions written at a parent level also apply to C71.

Broader instructions also apply from Chapter 2: Neoplasms.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about C71

Is C71 billable?

No. C71 is a header code. Report one of its more specific subcodes instead.