G99: Other disorders of nervous system in diseases classified elsewhere
G99.8: Other specified disorders of nervous system in diseases classified elsewhere

codeFirst
underlying disorder, such as:
amyloidosis (E85.-)
avitaminosis (E56.9)

excludes1
nervous system involvement in:
cysticercosis (B69.0)
rubella (B06.0-)
syphilis (A52.1-)

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