G04 vs G37.4
G04 (Encephalitis, myelitis and encephalomyelitis) compared with G37.4 (Subacute necrotizing myelitis of central nervous system), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. G04 carries an Excludes2 note covering G37.4: “subacute necrotizing myelitis (G37.4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| G04Encephalitis, myelitis and encephalomyelitis | G37.4Subacute necrotizing myelitis of central nervous system | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Encephalitis, myelitis and encephalomyelitis is a non-billable ICD-10-CM category code (G04). | Subacute necrotizing myelitis of central nervous system is a billable ICD-10-CM diagnosis code (G37.4). |
| Includes | 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