Is G40.3 a billable ICD-10-CM code?

No. G40.3 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does G40.3 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Episodic and paroxysmal disorders (G40-G47).

G40.3

G40.3 — Generalized idiopathic epilepsy and epileptic syndromes

Non-billable headerICD-10-CM

G40.3 is a non-billable header ICD-10-CM code for generalized idiopathic epilepsy and epileptic syndromes. It cannot be billed on its own: choose one of the more specific child codes below.

Code also

Both codes may be needed to describe the encounter fully. Sequencing depends on the reason for the visit.

MERRF syndrome, if applicable (E88.42)

Other codes that can never be billed with G40.3

These codes carry an Excludes1 note pointing at G40.3. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G40.3 alone.

P90Convulsions of newborn

Risk adjustment

G40.3 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 G40.3

2 child codes. Green means billable.

Related codes at this level

Codes that share G40. If G40.3 is not quite right, the correct code is usually one of these.

Questions about G40.3

Is G40.3 a billable ICD-10-CM code?: No. G40.3 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does G40.3 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Episodic and paroxysmal disorders (G40-G47).