All ICD10 Codes

G04

Non-Billable
ChapterG00–G99
Rankcategory
Description

Encephalitis, myelitis and encephalomyelitis

About ICD-10-CM code G04

The ICD-10-CM tabular list places Encephalitis, myelitis and encephalomyelitis at code G04, inside G00-G99 Diseases of the Nervous System, within Inflammatory diseases of the central nervous system (G00-G09). You should not submit this code on claims since it lacks billing specificity, use a child code.

Use a more specific code (2 billable, 4 non-billable)
G04.0Acute disseminated encephalitis and encephalomyelitis (ADEM)has subcodesG04.1Tropical spastic paraplegiaG04.2Bacterial meningoencephalitis and meningomyelitis, not elsewhere classifiedG04.3Acute necrotizing hemorrhagic encephalopathyhas subcodesG04.8Other encephalitis, myelitis and encephalomyelitishas subcodesG04.9Encephalitis, myelitis and encephalomyelitis, unspecifiedhas subcodes
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 6: Diseases of the Nervous System (G00-G99).

CH6 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Instructional Notes

Includes
  • acute ascending myelitis
  • meningoencephalitis
  • meningomyelitis
Excludes1(Not coded here. Use a different code.)
Excludes2(Not included here. Code separately if applicable.)
  • acute transverse myelitis (G37.3)
  • alcoholic encephalopathy (G31.2)
  • multiple sclerosis (G35-)
  • myalgic encephalomyelitis (G93.32)
  • subacute necrotizing myelitis (G37.4)
  • toxic encephalitis (G92.8)
  • toxic encephalopathy (G92.8)

Clinical Hierarchy

BillableHas subcodes
CH6Diseases of the nervous system (G00-G99)
G00-G09Inflammatory diseases of the central nervous system (G00-G09)
G04Encephalitis, myelitis and encephalomyelitisNot billable
G04.0Acute disseminated encephalitis and encephalomyelitis (ADEM)Subcodes
G04.1Tropical spastic paraplegiaBillable
G04.2Bacterial meningoencephalitis and meningomyelitis, not elsewhere classifiedBillable
G04.3Acute necrotizing hemorrhagic encephalopathySubcodes
G04.8Other encephalitis, myelitis and encephalomyelitisSubcodes
G04.9Encephalitis, myelitis and encephalomyelitis, unspecifiedSubcodes

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to G04:

chapterCH6
Diseases of the nervous system (G00-G99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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