G04.01

Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)

Billable / specific

G04.01 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

Not coded here — never report together with this code.

post chickenpox encephalitis (B01.1)
post measles encephalitis (B05.0)
post measles myelitis (B05.1)
acute necrotizing hemorrhagic encephalopathy (G04.3-) (from G04.0)
other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81) (from G04.0)
encephalopathy NOS (G93.40) (from G04)

Not included here — may be reported together when both conditions exist.

certain conditions originating in the perinatal period (P04-P96) (from G04)
certain infectious and parasitic diseases (A00-B99) (from G04)
complications of pregnancy, childbirth and the puerperium (O00-O9A) (from G04)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) (from G04)
endocrine, nutritional and metabolic diseases (E00-E88) (from G04)
injury, poisoning and certain other consequences of external causes (S00-T88) (from G04)
neoplasms (C00-D49) (from G04)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) (from G04)
acute transverse myelitis (G37.3) (from G04)
alcoholic encephalopathy (G31.2) (from G04)
multiple sclerosis (G35-) (from G04)
myalgic encephalomyelitis (G93.32) (from G04)
subacute necrotizing myelitis (G37.4) (from G04)
toxic encephalitis (G92.8) (from G04)
toxic encephalopathy (G92.8) (from G04)

G04.00Acute disseminated encephalitis and encephalomyelitis, unspecifiedBillable
G04.02Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitisBillable