G04.8 ICD-10-CA code: Other encephalitis, myelitis and encephalomyelitis
G04.8 is the ICD-10-CA code for “Other encephalitis, myelitis and encephalomyelitis” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
G04.8Other encephalitis, myelitis and encephalomyelitis
Short description: Oth encephalit myelitis encephalomyelit
ICD-10-CA · Canada · Also written G048
Index terms
Entries in CIHI’s alphabetical index that lead to G04.8. Searching the index by the condition the note names is how coders reach this code.
- Encephalomyelitis, specified NEC
- Leukoencephalitis (postinfectious)
- Rasmussen encephalitis or syndrome
- Encephalomyelitis, postinfectious NEC
- Meningoencephalitis, specified organism NEC
- Myelitis (acute) (ascending), specified NEC
- Myelitis (acute) (ascending), postinfectious NEC
- Infection, infected (opportunistic), spinal cord NEC, streptococcal
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute), suppurative
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute), specified NEC
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute), postinfectious NEC
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute), Rasmussen (subacute)
Notes for G04.8
As CIHI prints them, with any note G04.8 takes from the headings above it.
Includes
- Postinfectious encephalitis and encephalomyelitis NOS
- Acute ascending myelitismeningoencephalitismeningomyelitisFrom G04 Encephalitis, myelitis and encephalomyelitis
Use additional code
Add a code for this detail when the note documents it.
- Use additional code to identify any associated epileptic seizures (G40.-)
Excludes
Conditions classified elsewhere.
- Encephalopathy:• NOS (G93.4)• alcoholic (G31.2)• toxic (G92)multiple sclerosis (G35)myalgic encephalomyelitis (G93.3)myelitis:• acute transverse (G37.3)• subacute necrotizing (G37.4)West Nile encephalitis (A92.3)West Nile encephalomyelitis (A92.3)From G04 Encephalitis, myelitis and encephalomyelitis
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 6: Diseases of the nervous system (G00-G99)
Where G04.8 sits
- 1ChapterChapter 6: Diseases of the nervous system (G00-G99)
- 2Block G00-G09Inflammatory diseases of the central nervous system
- 3Category G04Encephalitis, myelitis and encephalomyelitis
- 4Valid code G04.8Other encephalitis, myelitis and encephalomyelitis
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code G04.8 mean?
G04.8 is the ICD-10-CA code for “Other encephalitis, myelitis and encephalomyelitis” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is G04.8 in ICD-10-CA?
G04.8 sits under G04 Encephalitis, myelitis and encephalomyelitis, within G00-G09 Inflammatory diseases of the central nervous system, within Chapter 6: Diseases of the nervous system (G00-G99).
What coding notes apply to G04.8?
ICD-10-CA lists Includes, Use additional code, Excludes notes for G04.8, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.