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ICD-10 Code A84.89: Other tick-borne viral encephalitis

A84.89 is a billable ICD-10 diagnosis code used to classify Other tick-borne viral encephalitis in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

When is it used?

  • May be used when a clinician documents other tick-borne viral encephalitis in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
1Certain infectious and parasitic diseases (A00-B99)
block
A80-A89Viral and prion infections of the central nervous system
category
A84Tick-borne viral encephalitis
category
A84.8Other tick-borne viral encephalitis
currentA84.8

Official coding notes

Inclusion terms
  • Louping ill
Applicable to
  • , if applicable, transfusion related infection (T80.22-)
Code first
  • , if applicable, transfusion related infection (T80.22-)

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

Infectious Disease SpecialistGeneral Physician

Coverage-related procedures and services

CPT 0595Uhigh
INFECTIOUS DISEASE (TROPICAL FEVER PATHOGENS), VECTOR-BORNE AND ZOONOTIC PATHOGENS, INCLUDING 2 VIRUSES (CHIKUNGUNYA VIRUS AND DENGUE VIRUS SEROTYPES 1, 2, 3, AND 4), 1 BACTERIUM (LEPTOSPIRA SPECIES), AND 1 PARASITE WITH SPECIES DIFFERENTIATION (PLASMODIUM SPECIES, PLASMODIUM FALCIPARUM, AND PLASMODIUM VIVAX/OVALE), REAL-TIME RT-PCR, WHOLE BLOOD, EACH PATHOGEN REPORTED AS DETECTED OR NOT DETECTED
Source: CMS coverage guidance
CPT 87999high
UNLISTED MICROBIOLOGY PROCEDURE
Source: CMS coverage guidance
CPT 95939high
CENTRAL MOTOR EVOKED POTENTIAL STUDY (TRANSCRANIAL MOTOR STIMULATION); IN UPPER AND LOWER LIMBS
Source: CMS coverage guidance
CPT 95929high
CENTRAL MOTOR EVOKED POTENTIAL STUDY (TRANSCRANIAL MOTOR STIMULATION); LOWER LIMBS
Source: CMS coverage guidance
CPT 95928high
CENTRAL MOTOR EVOKED POTENTIAL STUDY (TRANSCRANIAL MOTOR STIMULATION); UPPER LIMBS
Source: CMS coverage guidance
CPT 72126high
COMPUTED TOMOGRAPHY, CERVICAL SPINE; WITH CONTRAST MATERIAL
Source: CMS coverage guidance

Coding guidelines

Common synonyms

Other tick-borne viral encephalitis

Frequently asked questions

Code details

CodeA84.89
SystemICD10
Display nameOther tick-borne viral encephalitis
ChapterCertain infectious and parasitic diseases (A00-B99)
BlockViral and prion infections of the central nervous system

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Encephalitis(chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)Encephalitis(chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)Encephalitis(chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)Louping ill(encephalitis)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code A84.89 for Other tick-borne viral encephalitis | HealthAssure