Note: 1 Certain infectious and parasitic diseases; 2 Neoplasms; 3 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism; 4 Endocrine, nutritional and metabolic diseases; 5 Mental and behavioural disorders; 6 Diseases of the nervous system; 7 Diseases of the eye and adnexa; 8 Diseases of the ear and mastoid process; 9 Diseases of the circulatory system; 10 Diseases of the respiratory system; 11 Diseases of the digestive system; 12 Diseases of the skin and subcutaneous tissue; 13 Diseases of the musculoskeletal system and connective tissue; 14 Diseases of the genitourinary system; 15 Pregnancy, childbirth and the puerperium; 16 Certain conditions originating in the perinatal period; 17 Congenital malformations, deformations and chromosomal abnormalities; 18 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified; 19 Injury, poisoning and certain other consequences of external causes; 20 External causes of morbidity and mortality; 21 Factors influencing health status and contact with health services; 22 Codes for special purposes.