A86

Billable

Unspecified viral encephalitis

A86 is the ICD-10-CM code for Unspecified viral encephalitis. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
A00-B99
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 ↗

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

Includes

  • Viral encephalomyelitis NOS
  • Viral meningoencephalitis NOS

Frequently asked questions

What is ICD-10 code A86?
A86 is the ICD-10-CM code for "Unspecified viral encephalitis". It falls under A00-B99 Certain infectious and parasitic diseases.
Is A86 a billable code?
Yes — A86 is a billable, specific ICD-10-CM code valid for reimbursement.

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

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