A84.89 – Other tick-borne viral encephalitis

ICD-10-CM 2027 diagnosis code · Viral and prion infections of the central nervous system

Billable code

ICD-10-CM code A84.89

Code: A84.89 (claims format: A8489)
Description: Other tick-borne viral encephalitis
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: A80-A89 Viral and prion infections of the central nervous system
Parent codes: A84 › A84.8

Notes for A84.89

Applicable to:

Louping ill

Code first:

, if applicable, transfusion related infection (T80.22-)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

A84 – Tick-borne viral encephalitis

Includes:

tick-borne viral meningoencephalitis

Block A80-A89

Excludes1 (not coded here):

postpolio syndrome (G14)
sequelae of poliomyelitis (B91)
sequelae of viral encephalitis (B94.1)

Index terms for A84.89

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in A84.8

A84.81 – Powassan virus diseaseBillable

Frequently asked questions

What is ICD-10 code A84.89?

A84.89 is the ICD-10-CM code for other tick-borne viral encephalitis, in the block A80-A89 (Viral and prion infections of the central nervous system).

Is A84.89 a billable code?

Yes. A84.89 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does A84.89 belong to?

It belongs to category A84 – Tick-borne viral encephalitis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.