G31
G31: Other degenerative diseases of nervous system, not elsewhere classified
Non-billable headerICD-10-CM
G31 is a non-billable header ICD-10-CM code for other degenerative diseases of nervous system, not elsewhere classified. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes2: not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
- Reye's syndrome (G93.7)
Use additional code
Add a secondary code to capture the detail described below.
- 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-)
Other codes that can never be billed with G31
Their own Excludes1 notes name this code, so the conflict is not listed above.
- E74.4Disorders of pyruvate metabolism and gluconeogenesis
- E88.4Mitochondrial metabolism disorders
- F06.7Mild neurocognitive disorder due to known physiological condition
- F07.0Personality change due to known physiological condition
- G21Secondary parkinsonism
- G30Alzheimer's disease
- G31.84Mild cognitive impairment of uncertain or unknown etiology
- G32.81Cerebellar ataxia in diseases classified elsewhere
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead G31
5 child codes. Green means billable.