G99.8 Other specified disorders of nervous system in diseases classified elsewhere
Billable ICD-10-CM code, FY2026.
Excludes1 (never code together)
nervous system involvement in:
cysticercosis (B69.0)
rubella (B06.0-)
syphilis (A52.1-)
Code first
underlying disorder, such as:
amyloidosis (E85.-)
avitaminosis (E56.-)
MS-DRG index
Defines the logic of DRG(s) 070-072 in MDC 01.
Approximate ICD-9-CM (GEMs)
349.89 Other specified disorders of nervous system (approximate)
Medicare Code Edits (MCE v43.1 (April 2026))
Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.
Diagnosis Index entries for G99.8
Degeneration, degenerative › nervous system › amyloid