ICD-10 Code for Meningoencephalitis
The default ICD-10-CM 2027 code for meningoencephalitis is G04.90 – Encephalitis and encephalomyelitis, unspecified. More specific codes depend on the details documented, as listed in the official index (25 codes, 25 billable).
- Main code
G04.90– Encephalitis and encephalomyelitis, unspecified- Billable
- Yes
- See also
- Encephalitis
Index entries for Meningoencephalitis
- 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 - 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 - 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
- congenital –
- blastomycosis NEC –
- infectious (acute) (viral) –
A86 - influenzal (H. influenzae) –
G00.0 - Listeria monocytogenes –
A32.12 - lymphocytic (serous) –
A87.2 - mumps –
B26.2 - parasitic NEC –
B89–G05.3[manifestation] - 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
How to choose the right code
Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.
Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.