A80-A89 ICD-10-CA block: Viral infections of the central nervous system

A80-A89 isn’t a code on its own. Choose one of the 41 codes beneath it, the one the documentation supports.

Official description

A80-A89

Viral infections of the central nervous system (A80-A89)

ICD-10-CA · Canada

Codes in A80-A89

A80-A89 isn’t a code on its own. Open the group that matches what the note documents.

A80Acute poliomyelitis (6 codes)A81Atypical virus infections of central nervous system (5 codes)A82Rabies (3 codes)A83Mosquito-borne viral encephalitis (9 codes)A84Tick-borne viral encephalitis (4 codes)A85Other viral encephalitis, not elsewhere classified (4 codes)A86Unspecified viral encephalitis A87Viral meningitis (5 codes)A88Other viral infections of central nervous system, not elsewhere classified (3 codes)A89Unspecified viral infection of central nervous system

Notes for A80-A89

As CIHI prints them, with any note A80-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)
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 A80-A89 sits

1ChapterChapter 1: Certain infectious and parasitic diseases (A00-B99)
2Block A80-A89Viral infections of the 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.

See A80-A89 in the CIHI source

Frequently asked questions

Is A80-A89 a valid ICD-10-CA code?

No. A80-A89 (Viral infections of the central nervous system) is a block heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 41 codes; record the one the documentation supports.

Where is A80-A89 in ICD-10-CA?

A80-A89 sits under Chapter 1: Certain infectious and parasitic diseases (A00-B99).

What coding notes apply to A80-A89?

ICD-10-CA lists Excludes, Includes, Use additional code notes for A80-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.