Diseases of the nervous system (G00-G99)

Excludes 2:
certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Systemic atrophies primarily affecting the central nervous system (G10-G14)

G10 Huntington's disease
Huntington's chorea
Huntington's dementia
Use additional code, if applicable, to identify:
Use additional dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)
Use additional dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
Use additional dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
Use additional dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
Use additional dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
Use additional mild neurocognitive disorder due to known physiological condition (F06.7-)
G11 Hereditary ataxia [+]
Excludes 2: cerebral palsy (G80.-)
hereditary and idiopathic neuropathy (G60.-)
metabolic disorders (E70-E88)
G12 Spinal muscular atrophy and related syndromes [+]
G13 Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere [+]
G14 Postpolio syndrome
Includes: postpolio myelitic syndrome
Excludes 1: sequelae of poliomyelitis (B91)

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