1A61

ICD-11 MMS 2026-01

Early syphilis

Description

A disease caused by an infection with the gram-negative bacteria Treponema pallidum pallidum, including primary and secondary stages of syphilis, and early latent syphilis of less than 2 years duration. This disease is characterised by a single chancre in the primary stage, and diffuse rash in the secondary stage. Transmission is commonly by sexual contact.

Excludes

  • 1A60.Z – Early congenital syphilis

Exclusions from above levels

  • FA11.2 – Arthropathy following genitourinary infection
  • GC02.1 – Nonspecific and nongonococcal urethritis
  • NE83.1 – Infection arising from device, implant or graft, not elsewhere classified

Child codes

  • 1A61.0 – Primary genital syphilis
  • 1A61.1 – Primary anal syphilis
  • 1A61.2 – Primary syphilis of other sites
  • 1A61.3 – Secondary syphilis of skin or mucous membranes
  • 1A61.4 – Secondary syphilis of other sites
  • 1A61.5 – Latent early syphilis
  • 1A61.Y – Other specified early syphilis
  • 1A61.Z – Early syphilis, unspecified

Sibling codes

  • 1A60 – Congenital syphilis
  • 1A62 – Late syphilis
  • 1A63 – Latent syphilis, unspecified as early or late
  • 1A6Z – Syphilis, unspecified

Foundation entity

Early syphilis – http://id.who.int/icd/entity/1179111584

Allowed postcoordination axes

Part of: 01: Certain infectious or parasitic diseases