G04.01
Billable codePostinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
The ICD-10 code for postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious adem) is G04.01.
Clinical notes
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- G04.00Acute disseminated encephalitis and encephalomyelitis, unspecified
- G04.02Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis
- G04.01Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 32361Approximate match
Associated MS-DRGs
G04.01 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.
- DRG 023Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
- DRG 024Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC
- DRG 097Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC
- DRG 098Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC
- DRG 099Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC