G04.0
Header — not billableAcute disseminated encephalitis and encephalomyelitis (ADEM)
The ICD-10 code for acute disseminated encephalitis and encephalomyelitis (adem) is G04.0.
G04.0 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 3 more specific codes below.
Clinical notes
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- G04.1Tropical spastic paraplegia
- G04.2Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
- G04.3Acute necrotizing hemorrhagic encephalopathynon-billable header
- G04.8Other encephalitis, myelitis and encephalomyelitisnon-billable header
- G04.9Encephalitis, myelitis and encephalomyelitis, unspecifiednon-billable header
- G04.0Acute disseminated encephalitis and encephalomyelitis (ADEM)non-billable header