Other degenerative diseases of nervous system, not elsewhere classified - G31
Use Additional Code: This note indicates that an additional code should be used in conjunction with the primary code "G31" to provide a complete picture of the patient's condition or to capture associated factors.
Use Additional:
- For codes G31.0-G31.83, G31.85-G31.9, use additional code, if applicable, 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-)
Excludes2: This note means that the conditions described by two codes are not usually associated with each other but can sometimes occur together.
Type 2 Excludes:
- Reye's syndrome (G93.7)
These ranges represents subcategories of Other degenerative diseases of nervous system, not elsewhere classified. The "G31" signifies that these are the diseases within this broad category.
Codes:
- G31.0 - Frontotemporal dementia
- G31.01 - Pick's disease
- G31.09 - Other frontotemporal neurocognitive disorder
- G31.1 - Senile degeneration of brain, not elsewhere classified
- G31.2 - Degeneration of nervous system due to alcohol
- G31.8 - Other specified degenerative diseases of nervous system
- G31.80 - Leukodystrophy, unspecified
- G31.81 - Alpers disease
- G31.82 - Leigh's disease
- G31.83 - Neurocognitive disorder with Lewy bodies
- G31.84 - Mild cognitive impairment of uncertain or unknown etiology
- G31.85 - Corticobasal degeneration
- G31.86 - Alexander disease
- G31.89 - Other specified degenerative diseases of nervous system
- G31.9 - Degenerative disease of nervous system, unspecified