01 Certain infectious or parasitic diseases

 02 Neoplasms

 03 Diseases of the blood or blood-forming organs

 04 Diseases of the immune system

 05 Endocrine, nutritional or metabolic diseases

 06 Mental, behavioural or neurodevelopmental disorders

 07 Sleep-wake disorders

 08 Diseases of the nervous system

 09 Diseases of the visual system

 10 Diseases of the ear or mastoid process

 11 Diseases of the circulatory system

 12 Diseases of the respiratory system

   Upper respiratory tract disorders

   Certain lower respiratory tract diseases

   Lung infections

   Lung diseases due to external agents

   Respiratory diseases principally affecting the lung interstitium

     CB00  Acute respiratory distress syndrome

     CB01  Pulmonary oedema

     CB02  Pulmonary eosinophilia

     CB03  Idiopathic interstitial pneumonitis

     CB04  Primary interstitial lung diseases specific to infancy or childhood

     CB05  Interstitial lung diseases associated with systemic diseases

     CB06  Pulmonary alveolar microlithiasis

     CB07  Lymphangioleiomyomatosis

     CB0Y  Other specified respiratory diseases principally affecting the lung interstitium

     CB0Z  Respiratory diseases principally affecting the lung interstitium, unspecified

   Pleural, diaphragm or mediastinal disorders

   CB40  Certain diseases of the respiratory system

   CB41  Respiratory failure

   Postprocedural disorders of the respiratory system

   CB7Z  Diseases of the respiratory system, unspecified

 13 Diseases of the digestive system

 14 Diseases of the skin

 15 Diseases of the musculoskeletal system or connective tissue

 16 Diseases of the genitourinary system

 17 Conditions related to sexual health

 18 Pregnancy, childbirth or the puerperium

 19 Certain conditions originating in the perinatal period

 20 Developmental anomalies

 21 Symptoms, signs or clinical findings, not elsewhere classified

 22 Injury, poisoning or certain other consequences of external causes

 25 Codes for special purposes