G05 – Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

ICD-10-CM 2027 diagnosis code · Inflammatory diseases of the central nervous system

Non-billable header

ICD-10-CM code G05
Code
G05 (claims format: G05)
Description
Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
Short description
Encphlts, myelitis & encephalomyelitis in dis classd elswhr
Billable
No – use a more specific code below
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
6. Diseases of the nervous system (G00-G99)
Block
G00-G09 Inflammatory diseases of the central nervous system

Billable codes under G05

G05 is a header code and cannot be used on claims. Choose the most specific code:

Notes for G05

Excludes1 (not coded here):
  • 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)
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)

Frequently asked questions

What is ICD-10 code G05?

G05 is the ICD-10-CM code for encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere, in the block G00-G09 (Inflammatory diseases of the central nervous system).

Is G05 a billable code?

No. G05 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.