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:dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)mild neurocognitive disorder due to known physiological condition (F06.7-)Excludes2Reye's syndrome (G93.7)