G04.8Other encephalitis, myelitis and encephalomyelitis

G04.8 is the ICD-10-CM diagnosis code for other encephalitis, myelitis and encephalomyelitis. It belongs to category G04 (encephalitis, myelitis and encephalomyelitis), block G00-G09 (inflammatory diseases of the central nervous system) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within G04, choose G04.8 (Other encephalitis, myelitis and encephalomyelitis) only when documentation doesn't support a more specific option: acute disseminated encephalitis and encephalomyelitis (ADEM) (G04.0), tropical spastic paraplegia (G04.1), bacterial meningoencephalitis and meningomyelitis, not elsewhere classified (G04.2), acute necrotizing hemorrhagic encephalopathy (G04.3) and unspecified (G04.9).

To report this condition, pick the subcode that matches the documentation: G04.81 (encephalomyelitis), G04.82 (myelitis) and G04.89 (myelitis).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.