G04.0 vs G04.3
G04.0 (Acute disseminated encephalitis and encephalomyelitis (ADEM)) compared with G04.3 (Acute necrotizing hemorrhagic encephalopathy), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. G04.0 carries an Excludes1 note covering G04.3: “acute necrotizing hemorrhagic encephalopathy (G04.3-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. G04.3 carries an Excludes1 note covering G04.0: “acute disseminated encephalitis and encephalomyelitis (G04.0-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| G04.0Acute disseminated encephalitis and encephalomyelitis (ADEM) | G04.3Acute necrotizing hemorrhagic encephalopathy | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Acute disseminated encephalitis and encephalomyelitis (ADEM) is a non-billable ICD-10-CM category code (G04.0). | Acute necrotizing hemorrhagic encephalopathy is a non-billable ICD-10-CM category code (G04.3). |
| Includes | acute ascending myelitis meningoencephalitis meningomyelitis | acute ascending myelitis meningoencephalitis meningomyelitis |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources