A83.0
BillableJapanese encephalitis
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is A83.0 an HCC code?
No. A83.0 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A83.0 is the ICD-10-CM diagnosis code for japanese encephalitis. Japanese encephalitis is a serious brain infection caused by a virus spread through mosquito bites, primarily occurring in Asia and the Western Pacific region. It causes inflammation of the brain and can lead to fever, headache, confusion, and potentially severe neurological complications. A83.0 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering viral and prion infections of the central nervous system (a80-a89).
A83.0 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify the patient has confirmed or suspected Japanese encephalitis diagnosis documented by the physician; this is a reportable disease in many jurisdictions.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A83.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the patient has confirmed or suspected Japanese encephalitis diagnosis documented by the physician; this is a reportable disease in many jurisdictions
- •Document the geographic location or travel history to endemic areas (Japan, China, Southeast Asia, etc.) as this supports medical necessity and accurate coding