A50-A64 ICD-10-CA block: Infections with a predominantly sexual mode of transmission

A50-A64 isn’t a code on its own. Choose one of the 53 codes beneath it, the one the documentation supports.

Official description

A50-A64

Infections with a predominantly sexual mode of transmission (A50-A64)

ICD-10-CA · Canada

Codes in A50-A64

A50-A64 isn’t a code on its own. Open the group that matches what the note documents.

A50Congenital syphilis (9 codes)A51Early syphilis (7 codes)A52Late syphilis (7 codes)A53Other and unspecified syphilis (2 codes)A54Gonococcal infection (10 codes)A55Chlamydial lymphogranuloma (venereum)A56Other sexually transmitted chlamydial diseases (6 codes)A57Chancroid A58Granuloma inguinale A59Trichomoniasis (3 codes)A60Anogenital herpesviral [herpes simplex] infection (3 codes)A63Other predominantly sexually transmitted diseases, not elsewhere classified (2 codes)A64Unspecified sexually transmitted disease

Notes for A50-A64

As CIHI prints them, with any note A50-A64 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.

Human immunodeficiency virus [HIV] disease (B24)nonspecific and nongonococcal urethritis (N34.1)Reiter disease (M02.3-)
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 A50-A64 sits

1ChapterChapter 1: Certain infectious and parasitic diseases (A00-B99)
2Block A50-A64Infections with a predominantly sexual mode of transmission

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 A50-A64 in the CIHI source

Frequently asked questions

Is A50-A64 a valid ICD-10-CA code?

No. A50-A64 (Infections with a predominantly sexual mode of transmission) is a block heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 53 codes; record the one the documentation supports.

Where is A50-A64 in ICD-10-CA?

A50-A64 sits under Chapter 1: Certain infectious and parasitic diseases (A00-B99).

What coding notes apply to A50-A64?

ICD-10-CA lists Excludes, Includes, Use additional code notes for A50-A64, 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.