All ICD10 Codes

A84

Non-Billable
ChapterA00–B99
Rankcategory
Official Description

Tick-borne viral encephalitis

Use a more specific code (3 billable, 1 non-billable)
A84.0Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]A84.1Central European tick-borne encephalitisA84.8Other tick-borne viral encephalitishas subcodesA84.9Tick-borne viral encephalitis, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here. Use a different code.)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here. Code separately if applicable.)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)
Use Additional Code
  • code to identify resistance to antimicrobial drugs (Z16.-)

A80-A89 Parent Instructions

Excludes1(Not coded here. Use a different code.)
  • postpolio syndrome (G14)
  • sequelae of poliomyelitis (B91)
  • sequelae of viral encephalitis (B94.1)

Instructional Notes

Includes
  • tick-borne viral meningoencephalitis

Clinical Hierarchy

BillableHas subcodes
CH1Certain infectious and parasitic diseases (A00-B99)
A80-A89Viral and prion infections of the central nervous system (A80-A89)
A84Tick-borne viral encephalitisNot billable
A84.0Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]Billable
A84.1Central European tick-borne encephalitisBillable
A84.8Other tick-borne viral encephalitisSubcodes
A84.9Tick-borne viral encephalitis, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A84:

blockA80-A89
Viral and prion infections of the central nervous system (A80-A89)
View context instructions
chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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