A83
Non-billableMosquito-borne viral encephalitis
A83 is the ICD-10-CM code for Mosquito-borne viral encephalitis. It is a non-billable category code — use a more specific child code such as A83.0 for billing.
- Status
- Header (non-billable)
- Chapter
- A00-B99
- Subcodes
- 9
- Edition
- FY2026
A00-B99 Certain infectious and parasitic diseases
What this means — in plain language
MedlinePlus · NIHWhat is encephalitis? Encephalitis is inflammation (swelling) of the brain. It can happen when an infection or medical condition that affects the brain activates your immune system. The inflammation can cause a wide range of symptoms. In extreme cases, it can lead to brain damage, stroke , or even death. What causes encephalitis? There are different types of encephalitis, based on what the cause is. The two main…
Read more about Encephalitis at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Includes
- •mosquito-borne viral meningoencephalitis
Excludes2 — not included here
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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