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

   Hypertensive diseases

     BA00  Essential hypertension

     BA01  Hypertensive heart disease

     BA02  Hypertensive renal disease

     BA03  Hypertensive crisis

     BA04  Secondary hypertension

   Hypotension

   Ischaemic heart diseases

   Diseases of coronary artery

   Pulmonary heart disease or diseases of pulmonary circulation

   Pericarditis

   Acute or subacute endocarditis

   Heart valve diseases

   BC20  Chronic rheumatic heart diseases, not elsewhere classified

   Diseases of the myocardium or cardiac chambers

   Cardiac arrhythmia

   Heart failure

   Diseases of arteries or arterioles

   Diseases of veins

   Disorders of lymphatic vessels or lymph nodes

   Postprocedural disorders of circulatory system

   BE2Y  Other specified diseases of the circulatory system

   BE2Z  Diseases of the circulatory system, unspecified

 12 Diseases of the respiratory system

 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