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Home/Diagnosis/ICD-10 Coding for Encephalitis

ICD-10 Coding for Encephalitis

G04.0
G04.2
B00.4

Complete ICD-10-CM coding and documentation guide for icd-10 coding for encephalitis includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
Brain inflammation
Acute viral encephalitis
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Key Information: ICD-10 Coding for Encephalitis

Essential facts and insights about ICD-10 Coding for Encephalitis

Use ICD-10 code G04.0 for acute disseminated encephalomyelitis (adem), ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Acute disseminated encephalomyelitis (ADEM)

Non-Billable
G04.0
Non-Billable

Diagnostic Criteria

clinical:
  • • Presence of multifocal demyelination on MRI
documentation:
  • • Recent infection or vaccination history

Applicable To

  • • Post-infectious encephalitis
  • • Post-vaccination encephalitis

Important Notes

  • • Ensure MRI findings are documented to support ADEM diagnosis.

Bacterial meningoencephalitis

Billable Code
G04.2
Billable

Diagnostic Criteria

clinical:
  • • CSF culture or PCR confirming bacterial pathogen
  • • Clinical presentation of meningitis and encephalitis

Applicable To

  • • Listeria meningoencephalitis
  • • Mycoplasma meningoencephalitis

Important Notes

  • • Ensure bacterial etiology is confirmed through lab tests.

Herpes simplex encephalitis

Billable Code
B00.4
Billable

Diagnostic Criteria

clinical:
  • • CSF PCR positive for HSV
  • • MRI showing temporal lobe abnormalities

Applicable To

  • • HSV encephalitis

Important Notes

  • • Ensure HSV confirmation through CSF PCR.
Ancillary Codes

Additional codes that may be used with this diagnosis

R50.9

Fever, unspecified

Use when fever is documented as part of the clinical presentation.

Frequently Asked Questions

What is the ICD-10 code for encephalitis?

The ICD-10 code for unspecified encephalitis is G04.9. Specific types, such as herpes simplex encephalitis, use B00.4.

How is encephalitis documented for coding?

Encephalitis documentation should include specific etiology, clinical presentation, and diagnostic findings like CSF PCR and MRI results.

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