A83.4 Australian encephalitis
The ICD-10-CM code for Australian encephalitis is A83.4 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- A80-A89: Viral and prion infections of the central nervous system (A80-A89)
- Category A83
- 10 codes (9 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to A83.4:
- Arboencephalitis, Australian
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › Australian
- Australian › X disease
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › Murray Valley
- Disease, diseased › Australian X
- Disease, diseased › viral, virus › Kunjin
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › viral, virus › arthropod-borne NEC › mosquito-borne › Murray Valley
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › viral, virus › arthropod-borne NEC › mosquito-borne › Australian X disease
Inclusion Terms
- Kunjin virus disease
U.S. Hospital Utilization
A83.4 appeared in too few sampled U.S. inpatient stays in 2016 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient 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