The International Statistical Classification of Diseases and Related Health Problems (ICD -10 in his last internationally valid version of 2006) classified in the Chapter X Diseases of the respiratory system down standing key.
J00- J06 Acute upper respiratory tract
J09 - J18 flu and pneumonia
J20 -J22 Other acute infections of the lower respiratory tract
J30 - J39 Other diseases of upper respiratory tract
J40 - J47 Chronic diseases of the lower respiratory tract
J60 - J70 Lung diseases due to external agents
J80 - J84 Other diseases of respiratory system, primarily relating to the interstitium
J85 - J86 Suppurative and necrotic conditions of lower respiratory tract
J90 - J94 Other diseases of pleura
J95 - J99 Other diseases of the respiratory system