V.3.5.5 Brain Tumors

Use these instructions for cases diagnosed on or before 12/31/2013 only.

Do Not Use these rules for cases diagnosed 01/01/2014 forward, see Section V.3.7.2

Magnetic Resonance Imaging (MRI) or Positron Emission Tomography (PET) can sometimes establish the grade of a brain tumor.

If there is no tissue diagnosis, but grade or differentiation is stated in a MRI or PET report, base the grade code on the report.

However, if there is a tissue diagnosis, do not base the grade code on any other source.

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