2026 ICD-10-CM Diagnosis Code G05Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
G05 is a non-billable ICD-10-CM category code for encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G05.3 and G05.4.
Code Identity
Code Classification
Specific Coding for Encphlts, myelitis & encephalomyelitis in dis classd elswhrOverview
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code First
- underlying disease, such as:
- congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis P37.1
- cytomegaloviral encephalitis, myelitis and encephalomyelitis B25.8
- encephalitis, myelitis and encephalomyelitis in systemic lupus erythematosus M32.19
- eosinophilic meningoencephalitis B83.2
- human immunodeficiency virus HIV disease B20
- poliovirus A80
- suppurative otitis media H66.01 H66.4
- systemic lupus erythematosus M32.19
- trichinellosis B75
Type 1 Excludes
- adenoviral encephalitis, myelitis and encephalomyelitis A85.1
- encephalitis, myelitis and encephalomyelitis in measles B05.0
- enteroviral encephalitis, myelitis and encephalomyelitis A85.0
- herpesviral herpes simplex encephalitis, myelitis and encephalomyelitis B00.4
- listerial encephalitis, myelitis and encephalomyelitis A32.12
- meningococcal encephalitis, myelitis and encephalomyelitis A39.81
- mumps encephalitis, myelitis and encephalomyelitis B26.2
- postchickenpox encephalitis, myelitis and encephalomyelitis B01.1
- rubella encephalitis, myelitis and encephalomyelitis B06.01
- toxoplasmosis encephalitis, myelitis and encephalomyelitis B58.2
- zoster encephalitis, myelitis and encephalomyelitis B02.0
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Patient EducationClinical
Encephalitis
Encephalitis is inflammation (swelling) of the brain. It can happen when an infection or medical condition that affects the brain activates your immune system. The inflammation can cause a wide range of symptoms. In extreme cases, it can lead to brain damage, stroke, or even death.
The full article covers:
- What is encephalitis?
- What causes encephalitis?
- Who is more likely to get encephalitis?
- What are the symptoms of encephalitis?
- How is encephalitis diagnosed?
- What are the treatments for encephalitis?
- Can encephalitis be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code HistoryHistory
Questions About G05Overview
Is G05 a billable code?
No. This is a category header that groups the codes for encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere, and headers cannot be submitted on claims. Claims for encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere need a more specific code from this category, such as G05.3 and G05.4.
