Is G04.0 a billable ICD-10-CM code?

No. G04.0 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does G04.0 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Inflammatory diseases of the central nervous system (G00-G09).

What cannot be coded together with G04.0?

G04.0 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

G04.0

G04.0 — Acute disseminated encephalitis and encephalomyelitis (ADEM)

Non-billable headerICD-10-CM

G04.0 is a non-billable header ICD-10-CM code for acute disseminated encephalitis and encephalomyelitis (adem). 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.

acute necrotizing hemorrhagic encephalopathy (G04.3-)
other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81)

Other codes that can never be billed with G04.0

These codes carry an Excludes1 note pointing at G04.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G04.0 alone.

G36Other acute disseminated demyelination
G04.3Acute necrotizing hemorrhagic encephalopathy

Risk adjustment

G04.0 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 G04.0

3 child codes. Green means billable.

Related codes at this level

Codes that share G04. If G04.0 is not quite right, the correct code is usually one of these.

Questions about G04.0

Is G04.0 a billable ICD-10-CM code?: No. G04.0 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does G04.0 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Inflammatory diseases of the central nervous system (G00-G09).
What cannot be coded together with G04.0?: G04.0 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.