CA20.1Z

ICD-11 MMS 2026-01

Chronic bronchitis, unspecified

Coding note from above levels

Excludes acute infectious bronchitis

Exclusions from above levels

  • CA22 – chronic: obstructive pulmonary disease NOS
  • CA22.1 – chronic: emphysematous bronchitis
  • CA23.3 – bronchitis, asthmatic NOS
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  • CA81.Y – bronchitis, chemical (acute)
  • 01 – Certain infectious or parasitic diseases
  • 05 – Endocrine, nutritional or metabolic diseases
  • 18 – Complications of pregnancy, childbirth and the puerperium
  • 19 – Certain conditions originating in the perinatal period
  • 20 – Congenital malformations, deformations and chromosomal abnormalities
  • 22 – Injury, poisoning or certain other consequences of external causes

Sibling codes

  • CA20.10 – Simple chronic bronchitis
  • CA20.11 – Mucopurulent chronic bronchitis
  • CA20.12 – Mixed simple and mucopurulent chronic bronchitis
  • CA20.13 – Protracted bacterial bronchitis
  • CA20.1Y – Other specified chronic bronchitis

Foundation entity

Chronic bronchitis – http://id.who.int/icd/entity/290835130

Allowed postcoordination axes

Part of: CA20.1: Chronic bronchitis › CA20: Bronchitis › 12: Diseases of the respiratory system