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)

Other degenerative diseases of the nervous system (G30-G32)

G30 Alzheimer's disease [+]
Includes: Alzheimer's dementia senile and presenile forms
Use additional code, if applicable, to identify:
Use additional delirium, if applicable (F05)
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-)
Excludes 1: senile degeneration of brain NEC (G31.1)
senile dementia NOS (F03)
senility NOS (R41.81)
G31 Other degenerative diseases of nervous system, not elsewhere classified [+]
Use additional code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, 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-)
Excludes 2: Reye's syndrome (G93.7)
G32 Other degenerative disorders of nervous system in diseases classified elsewhere [+]

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