A84Header code — not billable

Tick-borne viral encephalitis

Chapter
1. Certain infectious and parasitic diseases
Category
A84
Effective date
October 1, 2026

Related codes in category A84

A84.0Far Eastern tick-borne encephalitisYesA84.1Central European tick-borne encephalitisYesA84.8Other tick-borne viral encephalitisA84.81Powassan virus diseaseYesA84.89Other tick-borne viral encephalitisYesA84.9Tick-borne viral encephalitis, unspecifiedYes

Frequently asked questions

What is ICD-10 code A84?

A84 is an ICD-10-CM diagnosis code for Tick-borne viral encephalitis.

Is A84 a billable code?

No. A84 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is A84 in?

A84 falls under Chapter 1: Certain infectious and parasitic diseases.

When did A84 become effective?

A84 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to A84?

A84 belongs to category A84, which includes 6 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.