G04.01

G04.01

Billable

Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

Sudden inflammation of the brain and spinal cord that develops following a recent infection or vaccination.

Coding Tips

•Document the preceding infection or vaccination and the time interval between the trigger event and symptom onset
•Code both the ADEM and the triggering condition when applicable

Excludes 1 — Do NOT code together

post chickenpox encephalitis (B01.1)
post measles encephalitis (B05.0)
post measles myelitis (B05.1)

Code Hierarchy

└G04Encephalitis, myelitis and encephalomyelitis └G04.0Acute disseminated encephalitis and encephalomyelitis (ADEM)└G04.01Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)

└G04.01Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)