1C23

ICD-11 MMS 2026-01

Trachoma

Description

A disease caused by an infection with the gram-negative bacteria Chlamydia trachomatis serovars A, B, and C. This disease is characterised by a roughening of the inner surfaces of the eyes, and inflammation that may lead to superficial vascularization of the cornea (pannus) and scarring of the conjunctiva. Long term effects include blindness or other visual impairments. Transmission is by direct or indirect contact with the eyes or nose of an infected individual.

Exclusions from above levels

  • NE83.1 – Infection arising from device, implant or graft, not elsewhere classified

Child codes

  • 1C23.0 – Initial stage of trachoma
  • 1C23.1 – Active stage of trachoma
  • 1C23.Y – Other specified trachoma
  • 1C23.Z – Trachoma, unspecified

Sibling codes

  • 1C20 – Chlamydial conjunctivitis
  • 1C21 – Chlamydial peritonitis
  • 1C22 – Infections due to Chlamydia psittaci
  • 1C2Y – Other specified diseases due to chlamydiae
  • 1C2Z – Diseases due to chlamydiae, unspecified

Foundation entity

Trachoma – http://id.who.int/icd/entity/372424530

Allowed postcoordination axes

Part of: 01: Certain infectious or parasitic diseases