1B21

ICD-11 MMS 2026-01

Infections due to non-tuberculous mycobacteria

Description

Any condition caused by an infection with Mycobacteria excluding infections due to Mycobacterium tuberculosis complex and Mycobacterium leprae. These conditions commonly present with lung disease; however, symptoms are dependent on the site of infection. Transmission is by direct contact with non-tuberculous Mycobacteria in the environment. Confirmation is by identification of non-tuberculous Mycobacteria from the affected site(s).

Excludes

  • 1B20 – Leprosy
  • http://id.who.int/icd/entity/2072728114 – Tuberculosis

Exclusions from above levels

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

Child codes

  • 1B21.0 – Pulmonary infection due to non-tuberculous mycobacterium
  • 1B21.1 – Non-tuberculous mycobacterial lymphadenitis
  • 1B21.2 – Cutaneous non-tuberculous mycobacterial infection
  • 1B21.3 – Disseminated non-tuberculous mycobacterial infection
  • 1B21.4 – Gastrointestinal non-tuberculous mycobacterial infection
  • 1B21.Y – Non-tuberculous mycobacterial infection of other specified site
  • 1B21.Z – Non-tuberculous mycobacterial infection of unspecified site

Sibling codes

  • 1B20 – Leprosy
  • 1B2Y – Other specified mycobacterial diseases
  • 1B2Z – Mycobacterial diseases, unspecified

Foundation entity

Infections due to non-tuberculous mycobacteria – http://id.who.int/icd/entity/1839818377

Allowed postcoordination axes

Part of: 01: Certain infectious or parasitic diseases