A89 ICD-10-CA code: Unspecified viral infection of central nervous system
A89 is the ICD-10-CA code for “Unspecified viral infection of central nervous system” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
A89Unspecified viral infection of central nervous system
Short description: Unspecified viral infections of CNS
ICD-10-CA · Canada
Index terms
Entries in CIHI’s alphabetical index that lead to A89. Searching the index by the condition the note names is how coders reach this code.
- Infection, infected (opportunistic), virus NEC, central nervous system
Notes for A89
As CIHI prints them, with any note A89 takes from the headings above it.
Includes
- 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 A89 sits
- 1ChapterChapter 1: Certain infectious and parasitic diseases (A00-B99)
- 2Block A80-A89Viral infections of the central nervous system
- 3Valid code A89Unspecified viral infection of central nervous system
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 A89 mean?
A89 is the ICD-10-CA code for “Unspecified viral infection of central nervous system” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is A89 in ICD-10-CA?
A89 sits under A80-A89 Viral infections of the central nervous system, within Chapter 1: Certain infectious and parasitic diseases (A00-B99).
What coding notes apply to A89?
ICD-10-CA lists Excludes, Includes, Use additional code notes for A89, 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.
Codes beside A89
View A80-A89A80Acute poliomyelitisA81Atypical virus infections of central nervous systemA82RabiesA83Mosquito-borne viral encephalitisA84Tick-borne viral encephalitisA85Other viral encephalitis, not elsewhere classifiedA86Unspecified viral encephalitisA87Viral meningitisA88Other viral infections of central nervous system, not elsewhere classified