G04.90
Billable codeEncephalitis and encephalomyelitis, unspecified
The ICD-10 code for encephalitis and encephalomyelitis, unspecified is G04.90.
Clinical notes
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Ventriculitis (cerebral) NOS
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- G04.91Myelitis, unspecified
- G04.90Encephalitis and encephalomyelitis, unspecified
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 3239Approximate match
Associated MS-DRGs
G04.90 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