Is G05 a billable ICD-10-CM code?

No. G05 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does G05 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 G05?

G05 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

G05

G05 — Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

Non-billable headerICD-10-CM

G05 is a non-billable header ICD-10-CM code for encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere. 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.

adenoviral encephalitis, myelitis and encephalomyelitis (A85.1)
encephalitis, myelitis and encephalomyelitis (in) measles (B05.0)
enteroviral encephalitis, myelitis and encephalomyelitis (A85.0)
herpesviral [herpes simplex] encephalitis, myelitis and encephalomyelitis (B00.4)
listerial encephalitis, myelitis and encephalomyelitis (A32.12)
meningococcal encephalitis, myelitis and encephalomyelitis (A39.81)
mumps encephalitis, myelitis and encephalomyelitis (B26.2)
postchickenpox encephalitis, myelitis and encephalomyelitis (B01.1-)
rubella encephalitis, myelitis and encephalomyelitis (B06.01)
toxoplasmosis encephalitis, myelitis and encephalomyelitis (B58.2)
zoster encephalitis, myelitis and encephalomyelitis (B02.0)

Code first

The underlying condition must be sequenced before this code.

underlying disease, such as:
congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis (P37.1)
cytomegaloviral encephalitis, myelitis and encephalomyelitis (B25.8)
encephalitis, myelitis and encephalomyelitis (in) systemic lupus erythematosus (M32.19)
eosinophilic meningoencephalitis (B83.2)
human immunodeficiency virus [HIV] disease (B20)
poliovirus (A80.-)
suppurative otitis media (H66.01-H66.4)
systemic lupus erythematosus (M32.19)
trichinellosis (B75)

Other codes that can never be billed with G05

These codes carry an Excludes1 note pointing at G05. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G05 alone.

G01Meningitis in bacterial diseases classified elsewhere
G02Meningitis in other infectious and parasitic diseases classified elsewhere

Risk adjustment

G05 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 G05

2 child codes. Green means billable.

Questions about G05

Is G05 a billable ICD-10-CM code?: No. G05 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does G05 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 G05?: G05 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.