G31.8
G31.8 — Other specified degenerative diseases of nervous system
Non-billable headerICD-10-CM
G31.8 is a non-billable header ICD-10-CM code for other specified degenerative diseases of nervous system. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with G31.8
These codes carry an Excludes1 note pointing at G31.8. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G31.8 alone.
- R41Other symptoms and signs involving cognitive functions and awareness
- E74.4Disorders of pyruvate metabolism and gluconeogenesis
- E88.4Mitochondrial metabolism disorders
- F06.7Mild neurocognitive disorder due to known physiological condition
- F07.0Personality change due to known physiological condition
- G21Secondary parkinsonism
- G71.3Mitochondrial myopathy, not elsewhere classified
Risk adjustment
G31.8 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead G31.8
9 child codes. Green means billable.
- G31.80Leukodystrophy, unspecified
- G31.81Alpers disease
- G31.82Leigh's disease
- G31.83Neurocognitive disorder with Lewy bodies
- G31.84Mild cognitive impairment of uncertain or unknown etiology
- G31.85Corticobasal degeneration
- G31.86Alexander disease
- G31.87Primary progressive apraxia of speech
- G31.89Other specified degenerative diseases of nervous system
Related codes at this level
Codes that share G31. If G31.8 is not quite right, the correct code is usually one of these.
Questions about G31.8
- Is G31.8 a billable ICD-10-CM code?
- No. G31.8 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does G31.8 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Other degenerative diseases of the nervous system (G30-G32).