A84.0 ICD-10-CA code: Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]
A84.0 is the ICD-10-CA code for “Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
A84.0Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]
Short description: Far Eastern tick borne encephalitis
ICD-10-CA · Canada · Also written A840
Index terms
Entries in CIHI’s alphabetical index that lead to A84.0. Searching the index by the condition the note names is how coders reach this code.
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute), Far Eastern (tick borne)
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute), Russian, spring summer (taiga)
Notes for A84.0
As CIHI prints them, with any note A84.0 takes from the headings above it.
Includes
- Tick-borne viral meningoencephalitisFrom A84 Tick-borne viral encephalitis
- Diseases generally recognized as communicable or transmissibleFrom Chapter 1: Certain infectious and parasitic diseases (A00-B99)
Use additional code
Add a code for this detail when the note documents it.
- Use additional code (U82-U84) to identify resistance to antimicrobial drugsFrom Chapter 1: Certain infectious and parasitic diseases (A00-B99)
Excludes
Conditions classified elsewhere.
- Sequelae of:• poliomyelitis (B91)• viral encephalitis (B94.1)From A80-A89 Viral infections of the central nervous system
- Carrier or suspected carrier of infectious disease (Z22.-)certain localized infections - see body system-related chaptersinfectious and parasitic diseases:• complicating pregnancy, childbirth and the puerperium [except obstetrical tetanus] (O98.-)• specific to the perinatal period [except tetanus neonatorum, whooping cough, congenital syphilis, perinatal gonococcal infection and perinatal human immunodeficiency virus [HIV] disease] (P35-P39)influenza and other acute respiratory infections (J00-J22)From Chapter 1: Certain infectious and parasitic diseases (A00-B99)
Where A84.0 sits
- 1ChapterChapter 1: Certain infectious and parasitic diseases (A00-B99)
- 2Block A80-A89Viral infections of the central nervous system
- 3Category A84Tick-borne viral encephalitis
- 4Valid code A84.0Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code A84.0 mean?
A84.0 is the ICD-10-CA code for “Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is A84.0 in ICD-10-CA?
A84.0 sits under A84 Tick-borne viral encephalitis, within A80-A89 Viral infections of the central nervous system, within Chapter 1: Certain infectious and parasitic diseases (A00-B99).
What coding notes apply to A84.0?
ICD-10-CA lists Includes, Excludes, Use additional code notes for A84.0, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.