B00.4
ICD-10BillableHerpesviral encephalitis
Official ICD-10-CM descriptor (FY2026)
Herpesviral encephalitis
B00.4 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Herpesviral meningoencephalitis
- Simian B disease
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- herpesviral encephalitis due to herpesvirus 6 and 7 (B10.01, B10.09)
- non-simplex herpesviral encephalitis (B10.0-)
Related codes in B00
- B00.0Eczema herpeticum
- B00.1Herpesviral vesicular dermatitis
- B00.2Herpesviral gingivostomatitis and pharyngotonsillitis
- B00.3Herpesviral meningitis
- B00.5Herpesviral ocular diseasecategory
- B00.7Disseminated herpesviral disease
- B00.8Other forms of herpesviral infectionscategory
- B00.9Herpesviral infection, unspecified
Where this code sits
- Parent code
- B00
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.