ICD-10-CM › G00-G99 › G30-G32 › G31 Other degenerative diseases of... › G31.9
Degenerative disease of nervous system, unspecified
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Degenerative disease of nervous system, unspecified
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from G31 Other degenerative diseases of nervous system, not elsewhere classified
Excludes2 - not included here
- Reye's syndrome (G93.7)
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-)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Hemidystrophy
- Atrophy, atrophic > cerebral
- Atrophy, atrophic > cortical
- Disease, diseased > cerebral
- Atrophy, atrophic > cerebellar
- Sclerosis, sclerotic > choroid
- Disorder > choroid > degeneration
- Degeneration, degenerative > chorioretinal
- Disease, diseased > cerebellar, cerebellum
- Degeneration, degenerative > Bruch's membrane
- Hemiatrophy > cerebellar
- Atrophy, atrophic > brain
- Degeneration, degenerative > brain
- Degeneration, degenerative > cerebellar NOS
- Degeneration, degenerative > nervous system
- Degeneration, degenerative > brain > childhood
Codes in the same group
| Code | Description | Status |
|---|---|---|
| G31.0 | Frontotemporal dementia | Not billable |
| G31.1 | Senile degeneration of brain, not elsewhere classified | Valid |
| G31.2 | Degeneration of nervous system due to alcohol | Valid |
| G31.8 | Other specified degenerative diseases of nervous system | Not billable |