CS Extension: Brain

Note: C71.0 is SUPRAtentorial, except the following subsites coded to C71.0 are INFRAtentorial: hypothalamus, pallium, thalamus.

Code Description TNM SS77 SS2000
05 Benign or borderline brain tumors NA NA NA
10 Supratentorial tumor confined to:
  • CEREBRAL HEMISPHERE (cerebrum) or MENINGES
    • Frontal lobe
    • Occipital lobe
    • Parietal lobe
    • Temporal lobe
 NA L L
11 Infratentorial tumor confined to:
CEREBELLUM or MENINGES of CEREBELLUM on one side:
  • Vermis:
    • Lateral lobes
    • Median lobe of cerebellum
 NA L L
12 Infratentorial tumor confined to:
  • BRAIN STEM or MENINGES of BRAIN STEM on one side:
    • Medulla oblongata
    • Midbrain (mesencephalon)
    • Pons
  • Hypothalamus
  • Thalamus
 NA L L
15
  • Confined to brain, NOS
  • Confined to meninges, NOS
 NA L L
20 Infratentorial tumor:
  • Both cerebellum and brain stem involved with tumor on one side
 NA L L
30
  • Confined to ventricles
  • Tumor invades or encroaches upon ventricular system
 NA L L
40
  • Tumor crosses the midline
  • Tumor involves contralateral hemisphere
  • Tumor involves corpus callosum (including splenium)
 NA RNOS RNOS
50 Supratentorial tumor extends infratentorially to involve cerebellum or brain stem NA RNOS RNOS
51 Infratentorial tumor extends supratentorially to involve cerebrum (cerebral hemisphere) NA RNOS RNOS
60 Tumor invades:
  • Bone (skull)
  • Major blood vessel(s)
  • Meninges (dura)
  • Nerves, NOS
    • Cranial nerves
  • Spinal cord/canal
 NA RNOS RNOS
70
  • Circulating cells in cerebral spinal fluid (CSF)
  • Nasal cavity
  • Nasopharynx
  • Posterior pharynx
  • Outside central nervous system (CNS)
 NA D D
80 Further contiguous extension NA D D
95 No evidence of primary tumor NA U U
99
  • Unknown extension
  • Primary tumor cannot be assessed
  • Not documented in patient record
 NA U U
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