1B73

ICD-11 MMS 2026-01

Ecthyma

Description

Ecthyma is a superficial ulcerative bacterial pyoderma. It is characterised by small, purulent, shallow, punched-out ulcers with thick, brown-black crusts and surrounding erythema. The commonest form is caused by beta-haemolytic streptococci, often in association with Staphylococcus aureus. It is associated with poor hygiene and malnutrition. Ecthyma gangrenosum is an uncommon severe variant caused by Pseudomonas aeruginosa.

Exclusions from above levels

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

Child codes

  • 1B73.0 – Streptococcal ecthyma
  • 1B73.1 – Staphylococcal ecthyma
  • 1B73.2 – Ecthyma gangrenosum
  • 1B73.Y – Other specified ecthyma
  • 1B73.Z – Ecthyma, unspecified

Sibling codes

  • 1B70 – Bacterial cellulitis, erysipelas or lymphangitis
  • 1B71 – Necrotising fasciitis
  • 1B72 – Impetigo
  • 1B74 – Superficial bacterial folliculitis
  • 1B75 – Deep bacterial folliculitis or pyogenic abscess of the skin
  • 1B7Y – Other specified pyogenic bacterial infection of skin or subcutaneous tissue
  • 1B7Z – Pyogenic bacterial infection of skin or subcutaneous tissue, unspecified

Foundation entity

Ecthyma – http://id.who.int/icd/entity/337308923

Part of: 01: Certain infectious or parasitic diseases