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ICD-10-CM Code G04.0
Acute disseminated encephalitis and encephalomyelitis (ADEM)

Non-Billable Code
Non-Billable means the code is not sufficient justification for admission to an acute care hospital when used a principal diagnosis. Use a child code to capture more detail.
| ICD-10 from 2011 - 2016

ICD Code G04.0 is a non-billable code. To code a diagnosis of this type, you must use one of the three child codes of G04.0 that describes the diagnosis 'acute disseminated encephalitis and encephalomyelitis (adem)' in more detail.

The ICD code G040 is used to code Acute disseminated encephalomyelitis

Acute disseminated encephalomyelitis (ADEM), or acute demyelinating encephalomyelitis, is a rare autoimmune disease marked by a sudden, widespread attack of inflammation in the brain and spinal cord. As well as causing the brain and spinal cord to become inflamed, ADEM also attacks the nerves of the central nervous system and damages their myelin insulation, which, as a result, destroys the white matter. It is often triggered after the patient has received a viral infection or vaccination.

Specialty: Neurology
MeSH Codes: D004673, D004673
ICD 9 Codes: 323.61, 323.81
Source: Wikipedia

Coding Notes for G04.0 Info for medical coders on how to properly use this ICD-10 code

Code Type-1 Excludes:
Type-1 Excludes
Type-1 Excludes mean the conditions excluded are mutually exclusive and should never be coded together. Excludes 1 means "do not code here."
Acute necrotizing hemorrhagic encephalopathy - instead, use code G04.3-
Other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) - instead, use code G04.81

Coding Advice SNOMET-CT

  • Possible requirement for an external cause code

Parent Code: G04 - Encephalitis, myelitis and encephalomyelitis

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/G040