G31.2 vs G90
G31.2 (Degeneration of nervous system due to alcohol) compared with G90 (Disorders of autonomic nervous system), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. G90 carries an Excludes1 note covering G31.2: “dysfunction of the autonomic nervous system due to alcohol (G31.2)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| G31.2Degeneration of nervous system due to alcohol | G90Disorders of autonomic nervous system | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Degeneration of nervous system due to alcohol is a billable ICD-10-CM diagnosis code (G31.2). | Disorders of autonomic nervous system is a non-billable ICD-10-CM category code (G90). |
| Includes | Alcoholic cerebellar ataxia Alcoholic cerebellar degeneration Alcoholic cerebral degeneration Alcoholic encephalopathy | — |
| Use additional code | 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-) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources