Is A84.9 a billable ICD-10 code?

Yes. A84.9 (Tick-borne viral encephalitis, unspecified) is billable and can be used for insurance claims. Always verify payer-specific requirements.

A84.9 ✓ Billable

Tick-borne viral encephalitis, unspecified

Q: What is ICD-10 code A84.9?

ICD-10-CM code A84.9 stands for "Tick-borne viral encephalitis, unspecified". It is a billable code in the Certain Infectious and Parasitic Diseases chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Certain Infectious and Parasitic Diseases

Code

A84.9

System

ICD-10-CM

Billable

Yes — valid for submission

Effective

FY2026

Chapter

Certain Infectious and Parasitic Diseases

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code A84.9?

ICD-10-CM code A84.9 represents Tick-borne viral encephalitis, unspecified. It is a billable diagnosis code in the Certain Infectious and Parasitic Diseases chapter, effective October 1, 2025 – September 30, 2026.

Is A84.9 billable?

Yes. A84.9 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is A84.9 in?

A84.9 belongs to the Certain Infectious and Parasitic Diseases chapter (A00–B99) of ICD-10-CM.

Related codes in the A84 category

A84 Tick-borne viral encephalitis Non-billable A84.0 Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis] Billable A84.1 Central European tick-borne encephalitis Billable A84.8 Other tick-borne viral encephalitis Non-billable A84.81 Powassan virus disease Billable A84.89 Other tick-borne viral encephalitis Billable

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