A84.8 – Other tick-borne viral encephalitis

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

Non-billable header

ICD-10-CM code A84.8

Code: A84.8 (claims format: A848)
Description: Other tick-borne viral encephalitis
Billable: No – use a more specific code below
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

Billable codes under A84.8

A84.8 is a header code and cannot be used on claims. Choose the most specific code:

A84.81 – Powassan virus diseaseBillable
A84.89 – Other tick-borne viral encephalitisBillable

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)

Related codes in A84

Frequently asked questions

What is ICD-10 code A84.8?

A84.8 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 A84.8 a billable code?

No. A84.8 is a header code with more specific child codes; report one of the billable codes listed above.

What category does A84.8 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.