B10.09 Other human herpesvirus encephalitis
The ICD-10-CM code for Other human herpesvirus encephalitis is B10.09 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- B10: Other human herpesviruses (B10)
- Category B10
- 8 codes (5 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to B10.09:
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › herpesviral › specified NEC
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › herpesviral › due to herpesvirus 7
- Meningoencephalitis › herpesviral, herpetic › specified NEC
- Herpes, herpesvirus, herpetic › encephalitis › due to herpesvirus 7
- Herpes, herpesvirus, herpetic › encephalitis › specified NEC
- Meningoencephalitis › herpesviral, herpetic › due to herpesvirus 7
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › in (due to) › herpes (simplex) virus › due to herpesvirus 7
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › in (due to) › herpes (simplex) virus › specified NEC
Inclusion Terms
- Human herpesvirus 7 encephalitis
U.S. Hospital Utilization
- An estimated 335 U.S. inpatient stays in 2023 included B10.09 among the documented diagnoses.
- 130 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
HIV Infections (TOC entry)a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19
Infectious agents causing diseases in other chapters (TOC)b. Infectious agents as the cause of diseases classified to other chapters ................................. 22
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026