G31.2 — Degeneration of nervous system due to alcohol
Is G31.2 billable?
Yes — G31.2 is billable for FY2027. G31.2 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. G31.2 may be submitted for encounters from October 1, 2026 through September 30, 2027.
G31.2 at a glance
| Code | G31.2 |
|---|---|
| Description | Degeneration of nervous system due to alcohol |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does G31.2 group to?
G31.2 sits in MDC 01 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 056Degenerative Nervous System Disorders with MCCmedical
- 057Degenerative Nervous System Disorders without MCCmedical
How is G31.2 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to G31.2. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Encephalopathy › alcoholic (acute)
- Ataxia, ataxy, ataxic › cerebellar › alcoholic
- Degeneration, degenerative › brain › alcoholic
- Degeneration, degenerative › cerebellar NOS › alcoholic
- Degeneration, degenerative › cortical › alcoholic
- Degeneration, degenerative › nervous system › alcoholic
- Dysfunction › autonomic › due to alcohol
- Ataxia, ataxy, ataxic › cerebellar › in › alcoholism
- Degeneration, degenerative › brain › in › alcoholism
Code also
Two codes may be needed to describe the condition fully. Whether G31.2 is sequenced first depends on the reason for the encounter.
- associated alcoholism (F10.-)
Inclusion terms
Alternative wording in documentation that is classified to G31.2.
- Alcoholic cerebellar ataxia
- Alcoholic cerebellar degeneration
- Alcoholic cerebral degeneration
- Alcoholic encephalopathy
- Dysfunction of the autonomic nervous system due to alcohol
Use additional code — inherited from G31
Report an additional code alongside G31.2 to fully describe the condition. G31.2 is sequenced first.
- 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-)
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G31.2, but a patient may have both at the same time. When documentation supports it, G31.2 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Excludes2 — not included here — inherited from G31
The conditions below are not part of G31.2, but a patient may have both at the same time. When documentation supports it, G31.2 and the excluded code may both be reported.
- Reye's syndrome (G93.7)
How long has G31.2 existed?
G31.2 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with G31.2?
ICD-10-CM declares these codes mutually exclusive with G31.2 — exactly one of each pair can be correct for a given encounter.