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A55 ICD-10-CA code: Chlamydial lymphogranuloma (venereum)

A55 is the ICD-10-CA code for “Chlamydial lymphogranuloma (venereum)” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

A55

Chlamydial lymphogranuloma (venereum)

ICD-10-CA · Canada

Index terms

Entries in CIHI’s alphabetical index that lead to A55. Searching the index by the condition the note names is how coders reach this code.

  • Esthiomene
  • Bubo, climatic
  • Bubo, tropical
  • Frei's disease
  • Genito anorectal syndrome
  • Syndrome, genito anorectal
  • Durand Nicolas Favre disease
  • Nicolas(Durand) Favre disease
  • Lymphopathia venereum, veneris
  • Lymphadenitis, venereal (chlamydial)
  • Bubo, inguinal (nonspecific), climatic
  • Lymphogranuloma (malignant), inguinale
  • Lymphogranuloma (malignant), chlamydial
  • Poradenitis, nostras inguinalis or venerea
  • Lymphadenitis, due to, chlamydial lymphogranuloma
  • Stricture, rectum (sphincter), inflammatory (chlamydial)
  • Lymphogranuloma (malignant), venereum (any site) (chlamydial)
  • Stricture, rectum (sphincter), due to, chlamydial lymphogranuloma
  • Infection, infected (opportunistic), Chlamydia, chlamydial, lymphogranuloma

Notes for A55

As CIHI prints them, with any note A55 takes from the headings above it.

Includes

  • Climatic or tropical buboDurand-Nicolas-Favre diseaseEsthiomeneLymphogranuloma inguinale
  • 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-)From A50-A64 Infections with a predominantly sexual mode of transmission
  • 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 A55 sits

  1. 1ChapterChapter 1: Certain infectious and parasitic diseases (A00-B99)
  2. 2Block A50-A64Infections with a predominantly sexual mode of transmission
  3. 3Valid code A55Chlamydial lymphogranuloma (venereum)

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 A55 in the CIHI source

Frequently asked questions

What does ICD-10-CA code A55 mean?

A55 is the ICD-10-CA code for “Chlamydial lymphogranuloma (venereum)” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is A55 in ICD-10-CA?

A55 sits under A50-A64 Infections with a predominantly sexual mode of transmission, within Chapter 1: Certain infectious and parasitic diseases (A00-B99).

What coding notes apply to A55?

ICD-10-CA lists Includes, Excludes, Use additional code notes for A55, 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 A55

A50Congenital syphilisA51Early syphilisA52Late syphilisA53Other and unspecified syphilisA54Gonococcal infectionA56Other sexually transmitted chlamydial diseasesA57ChancroidA58Granuloma inguinaleA59TrichomoniasisA60Anogenital herpesviral [herpes simplex] infectionA63Other predominantly sexually transmitted diseases, not elsewhere classifiedA64Unspecified sexually transmitted disease