G04Non-billableSave
G04 - Encephalitis, myelitis and encephalomyelitis
ICD-10-CM Chapter 6: Diseases of the nervous system · G00-G09 Inflammatory diseases of the central nervous system (G00-G09) · Top-level category · FY2027
Coding Guidance
G04 is a non-billable heading. Report one of the 6 more specific codes below.
Includes, Excludes and Coding Notes
IncludesFrom G04
Conditions this code covers.
- acute ascending myelitis
- meningoencephalitis
- meningomyelitis
Excludes 1 — Not Coded HereFrom G04
Mutually exclusive: these conditions are never reported together with this code.
- encephalopathy NOS (G93.40)
Excludes 2 — Not Included HereFrom G04
Not part of this code; report both codes when the patient has both conditions.
- 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)
Excludes 2 — Not Included HereFrom Chapter G00-G99
Not part of this code; report both codes when the patient has both conditions.
- 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)
More Specific Codes (6)
G04.0Acute disseminated encephalitis and encephalomyelitis (ADEM)Category→G04.1Tropical spastic paraplegiaBillable→G04.2Bacterial meningoencephalitis and meningomyelitis, not elsewhere classifiedBillable→G04.3Acute necrotizing hemorrhagic encephalopathyCategory→G04.8Other encephalitis, myelitis and encephalomyelitisCategory→G04.9Encephalitis, myelitis and encephalomyelitis, unspecifiedCategory→
Related condition guides
Documentation requirements, coding pitfalls and FAQs for conditions coded with G04.
Chapter Information
Related ICD-10 Codes
More specific codes for G04
Acute disseminated encephalitis and encephalomyelitis (ADEM)
G04.0›
Tropical spastic paraplegiaG04.1›
Bacterial meningoencephalitis and meningomyelitis, not elsewhere classifiedG04.2›
Acute necrotizing hemorrhagic encephalopathyG04.3›
Other encephalitis, myelitis and encephalomyelitisG04.8›
Encephalitis, myelitis and encephalomyelitis, unspecifiedG04.9›
Other categories in this chapter
Codes at the same level as G04
- Bacterial meningitis, not elsewhere classifiedG00
- Meningitis in bacterial diseases classified elsewhereG01
- Meningitis in other infectious and parasitic diseases classified elsewhereG02
- Meningitis due to other and unspecified causesG03
- Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhereG05
- Intracranial and intraspinal abscess and granulomaG06
- Intracranial and intraspinal abscess and granuloma in diseases classified elsewhereG07
- Intracranial and intraspinal phlebitis and thrombophlebitisG08
- Sequelae of inflammatory diseases of central nervous systemG09
- Huntington's diseaseG10
- Hereditary ataxiaG11
- Spinal muscular atrophy and related syndromesG12
- Systemic atrophies primarily affecting central nervous system in diseases classified elsewhereG13
- Postpolio syndromeG14
- Parkinson's diseaseG20
- Secondary parkinsonismG21
- Other degenerative diseases of basal gangliaG23
- DystoniaG24
- Other extrapyramidal and movement disordersG25
- Extrapyramidal and movement disorders in diseases classified elsewhereG26
- Alzheimer's diseaseG30
- Other degenerative diseases of nervous system, not elsewhere classifiedG31
- Other degenerative disorders of nervous system in diseases classified elsewhereG32
- Multiple sclerosisG35
- Other acute disseminated demyelinationG36
- Other demyelinating diseases of central nervous systemG37
- Epilepsy and recurrent seizuresG40
- MigraineG43
- Other headache syndromesG44
- Transient cerebral ischemic attacks and related syndromesG45
- Vascular syndromes of brain in cerebrovascular diseasesG46
- Sleep disordersG47
- Disorders of trigeminal nerveG50
- Facial nerve disordersG51
- Disorders of other cranial nervesG52
- Cranial nerve disorders in diseases classified elsewhereG53
- Nerve root and plexus disordersG54
- Nerve root and plexus compressions in diseases classified elsewhereG55
- Mononeuropathies of upper limbG56
- Mononeuropathies of lower limbG57
27 more in this chapter.