Is G31 a billable ICD-10-CM code?

No. G31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does G31 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Other degenerative diseases of the nervous system (G30-G32).

G31

G31 — Other degenerative diseases of nervous system, not elsewhere classified

Non-billable headerICD-10-CM

G31 is a non-billable header ICD-10-CM code for other degenerative diseases of nervous system, not elsewhere classified. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

Reye's syndrome (G93.7)

Use additional code

Add a secondary code to capture the detail described below.

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-)

Other codes that can never be billed with G31

These codes carry an Excludes1 note pointing at G31. 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 alone.

R41Other symptoms and signs involving cognitive functions and awareness
R47.01Aphasia
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
G30Alzheimer's disease

Risk adjustment

G31 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

5 child codes. Green means billable.

Questions about G31

Is G31 a billable ICD-10-CM code?: No. G31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does G31 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Other degenerative diseases of the nervous system (G30-G32).