G04.8
Other encephalitis, myelitis and encephalomyelitis
G04.8 is a non-billable ICD-10-CM code header for other encephalitis, myelitis and encephalomyelitis. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are G04.81 Other encephalitis and encephalomyelitis, G04.82 Acute flaccid myelitis and G04.89 Other myelitis. Its coding notes include a Code also instruction, 1 Excludes1 entry and 15 Excludes2 entries.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Includes
Further defines or gives examples of the content of the category.
- acute ascending myelitis
- meningoencephalitis
- meningomyelitis