G04.01
BillablePostinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
G04.01 is the ICD-10-CM code for Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM). It is a billable, specific code valid for reimbursement.
G00-G99 Diseases of the nervous system
What this means — in plain language
MedlinePlus · NIHWhat is encephalitis? Encephalitis is inflammation (swelling) of the brain. It can happen when an infection or medical condition that affects the brain activates your immune system. The inflammation can cause a wide range of symptoms. In extreme cases, it can lead to brain damage, stroke , or even death. What causes encephalitis? There are different types of encephalitis, based on what the cause is. The two main…
Read more about Encephalitis at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Excludes1 — not coded here
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
Frequently asked questions
- What is ICD-10 code G04.01?
- G04.01 is the ICD-10-CM code for "Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)". It falls under G00-G99 Diseases of the nervous system.
- Is G04.01 a billable code?
- Yes — G04.01 is a billable, specific ICD-10-CM code valid for reimbursement.
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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