G31.2 vs G90
G31.2 and G90 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on G90
dysfunction of the autonomic nervous system due to alcohol (G31.2)
G31.2
Degeneration of nervous system due to alcohol
Billable
- Chapter 6
- Diseases of the nervous system
- Section
- G30-G32
Use when the record says
- Alcoholic cerebellar ataxia
- Alcoholic cerebellar degeneration
- Alcoholic cerebral degeneration
- Alcoholic encephalopathy
- Dysfunction of the autonomic nervous system due to alcohol
Indexed under
- Encephalopathy › alcoholic (acute)
- Ataxia, ataxy, ataxic › cerebellar › alcoholic
- Degeneration, degenerative › brain › alcoholic
- Degeneration, degenerative › cerebellar NOS › alcoholic
- Degeneration, degenerative › cortical › alcoholic
G90
Disorders of autonomic nervous system
Not billable
- Chapter 6
- Diseases of the nervous system
- Section
- G89-G99
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027