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A84.8

Non-billable

Other tick-borne viral encephalitis

A84.8 is the ICD-10-CM code for Other tick-borne viral encephalitis. It is a non-billable category code — use a more specific child code such as A84.81 for billing.

Status
Header (non-billable)
Chapter
A00-B99
Parent
A84
Subcodes
2
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

What this means — in plain language

MedlinePlus · NIH

What 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 ↗
Viral Infections ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code A84.8?
A84.8 is the ICD-10-CM code for "Other tick-borne viral encephalitis". It falls under A00-B99 Certain infectious and parasitic diseases.
Is A84.8 a billable code?
No — A84.8 is a non-billable header code. Use a more specific child code (such as A84.81) for billing.
What are the subcodes of A84.8?
A84.8 has 2 more specific child codes, including A84.81, A84.89.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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