FY2027 ICD-10-CM reference
G05: Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
CMS-HCC V28
Not applicable to this nonbillable heading
CMS-HCC V24
Not applicable to this nonbillable heading
ESRD
Not applicable to this nonbillable heading
PACE
Not applicable to this nonbillable heading
RxHCC
Not applicable to this nonbillable heading
HHS-HCC
Not applicable to this nonbillable heading
More specific FY2027 codes
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: G00-G99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: G00-G99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: G00-G99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: G00-G99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: G00-G99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: G00-G99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: G00-G99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: G00-G99 (chapter, inherited).
Code first
underlying disease, such as:
Source: G05 (category, direct).
Code first
congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis (P37.1)
Source: G05 (category, direct).
Code first
cytomegaloviral encephalitis, myelitis and encephalomyelitis (B25.8)
Source: G05 (category, direct).
Code first
encephalitis, myelitis and encephalomyelitis (in) systemic lupus erythematosus (M32.19)
Source: G05 (category, direct).
Code first
eosinophilic meningoencephalitis (B83.2)
Source: G05 (category, direct).
Code first
human immunodeficiency virus [HIV] disease (B20)
Source: G05 (category, direct).
Code first
poliovirus (A80.-)
Source: G05 (category, direct).
Code first
suppurative otitis media (H66.01-H66.4)
Source: G05 (category, direct).
Code first
systemic lupus erythematosus (M32.19)
Source: G05 (category, direct).
Code first
trichinellosis (B75)
Source: G05 (category, direct).
Excludes1
adenoviral encephalitis, myelitis and encephalomyelitis (A85.1)
Source: G05 (category, direct).
Excludes1
encephalitis, myelitis and encephalomyelitis (in) measles (B05.0)
Source: G05 (category, direct).
Excludes1
enteroviral encephalitis, myelitis and encephalomyelitis (A85.0)
Source: G05 (category, direct).
Excludes1
herpesviral [herpes simplex] encephalitis, myelitis and encephalomyelitis (B00.4)
Source: G05 (category, direct).
Excludes1
listerial encephalitis, myelitis and encephalomyelitis (A32.12)
Source: G05 (category, direct).
Excludes1
meningococcal encephalitis, myelitis and encephalomyelitis (A39.81)
Source: G05 (category, direct).
Excludes1
mumps encephalitis, myelitis and encephalomyelitis (B26.2)
Source: G05 (category, direct).
Excludes1
postchickenpox encephalitis, myelitis and encephalomyelitis (B01.1-)
Source: G05 (category, direct).
Excludes1
rubella encephalitis, myelitis and encephalomyelitis (B06.01)
Source: G05 (category, direct).
Excludes1
toxoplasmosis encephalitis, myelitis and encephalomyelitis (B58.2)
Source: G05 (category, direct).
Excludes1
zoster encephalitis, myelitis and encephalomyelitis (B02.0)
Source: G05 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does G05 mean in FY2027?
The official ICD-10-CM descriptor is Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is G05 billable in FY2027?
The FY2027 order file marks G05 as a nonbillable heading. Select a complete billable child code.
Does G05 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition