G31.1 Senile degeneration of brain, not elsewhere classified
Billable ICD-10-CM code, FY2026.
Excludes1 (never code together)
- Alzheimer's disease (G30.-)
- senility NOS (R41.81)
Applies from G31 Other degenerative diseases of nervous system, not elsewhere classified
Excludes2 (not included here)
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-)
- 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-)
Risk adjustment (HCC)
- RxHCC V08: HCC 112 — Dementia, Except Alzheimer's Disease
- ESRD V24: HCC 52
MS-DRG index
Defines the logic of DRG(s) 056-057 in MDC 01.
Approximate ICD-9-CM (GEMs)
331.2 Senile degeneration of brain
Code annotations containing back-references to G31.1
Back-references to G31.1
- Type 1 Excludes:
G30 Alzheimer's disease ("senile degeneration of brain NEC (G31.1)")
Diagnosis Index entries for G31.1
- Atrophy, atrophic (of) › brain (cortex) (progressive) › senile NEC
- Degeneration, degenerative › brain (cortical) (progressive) › senile NEC
- Degeneration, degenerative › motor centers, senile
- Degeneration, degenerative › senile › brain
- Degeneration, degenerative › senile › motor centers
- Disease, diseased › brain › senile NEC
Nearby codes
G31 Other degenerative diseases of nervous system, not elsewhere classifiedG31.0 Frontotemporal dementiaG31.01 Pick's diseaseG31.09 Other frontotemporal neurocognitive disorderG31.1 Senile degeneration of brain, not elsewhere classified (this code)G31.2 Degeneration of nervous system due to alcoholG31.8 Other specified degenerative diseases of nervous systemG31.80 Leukodystrophy, unspecifiedG31.81 Alpers diseaseG31.82 Leigh's disease