Is G90 a billable ICD-10-CM code?

No. G90 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does G90 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Other disorders of the nervous system (G89-G99).

What cannot be coded together with G90?

G90 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

G90

G90 — Disorders of autonomic nervous system

Non-billable headerICD-10-CM

G90 is a non-billable header ICD-10-CM code for disorders of autonomic nervous system. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

dysfunction of the autonomic nervous system due to alcohol (G31.2)

Other codes that can never be billed with G90

These codes carry an Excludes1 note pointing at G90. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G90 alone.

M89.0Algoneurodystrophy
Q85Phakomatoses, not elsewhere classified
R03.1Nonspecific low blood-pressure reading
R55Syncope and collapse
G21Secondary parkinsonism
G56.4Causalgia of upper limb
G57.7Causalgia of lower limb
G89.2Chronic pain, not elsewhere classified

Risk adjustment

G90 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 G90

10 child codes. Green means billable.

Questions about G90

Is G90 a billable ICD-10-CM code?: No. G90 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does G90 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Other disorders of the nervous system (G89-G99).
What cannot be coded together with G90?: G90 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.