ICD-10-CM Alphabetic Index · FY 2026 45 Entries
Meningoencephalitis in the ICD-10-CM Index ICD-10-CM
The main term Meningoencephalitis carries 45 index entries pointing to 25 ICD-10-CM codes. The default entry is G04.90, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
45
Index Entries
25
Codes Referenced
G04.90
Default Code
M
Letter
45 of 45 shown
ICD-10-CM
Index Entries Under Meningoencephalitis 45 entries · 25 codes
Meningoencephalitis G04.90
acute NEC A86 see also Encephalitis, viral
bacterial NEC G04.2
California A83.5
diphasic A84.1
eosinophilic B83.2
epidemic A39.81
herpesviral, herpetic B00.4
due to herpesvirus 6 B10.01
due to herpesvirus 7 B10.09
specified NEC B10.09
in (due to)
blastomycosis NEC B40.81
diseases classified elsewhere G05.3
free-living amebae B60.2
Hemophilus influenzae (H. influenzae) G00.0
herpes B00.4
due to herpesvirus 6 B10.01
due to herpesvirus 7 B10.09
specified NEC B10.09
H. influenzae G00.0
Lyme disease A69.22
mercury
mumps B26.2
Naegleria (amebae) (organisms) (fowleri) B60.2
Parastrongylus cantonensis B83.2
toxoplasmosis (acquired) B58.2
congenital P37.1
infectious (acute) (viral) A86
influenzal (H. influenzae) G00.0
Listeria monocytogenes A32.12
lymphocytic (serous) A87.2
mumps B26.2
parasitic NEC B89
pneumococcal G04.2
primary amebic B60.2
specific (syphilitic) A52.14
specified organism NEC G04.81
staphylococcal G04.2
streptococcal G04.2
syphilitic A52.14
toxic NEC G92.8
due to mercury
tuberculous A17.82
virus NEC A86
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
