Table 1.

International disease classification codes for chronic obstructive pulmonary disease on which patient inclusion will be based.

ICD-10	ICD-9	ICPC
J41 Simple and mucopurulent chronic bronchitis	490 Bronchitis, not specified as acute or chronic	R79 Chronic bronchitis
J41.0 Simple chronic bronchitis	491 Chronic bronchitis
J41.1 Mucopurulent chronic bronchitis	491.0 Simple chronic bronchitis
J41.8 Mixed simple and mucopurulent chronic bronchitis	491.1 Mucopurulent chronic bronchitis
	491.2 Obstructive chronic bronchitis
	491.20 Obstructive chronic bronchitis – without exacerbation with the 2004 code modification: Emphysema with chronic bronchitis – without exacerbation
J42 Unspecified chronic bronchitis	491.9 Unspecified chronic bronchitis
J43 Emphysema	492 Emphysema
J43.0 MacLeod's syndrome	492.0 Emphysematous bleb
J43.1 Panlobular emphysema	492.8 Other emphysema
J43.2 Centrilobular emphysema
J43.8 Other emphysema
J43.9 Emphysema, unspecified
J44 Other chronic obstructive pulmonary disease	491.21 Obstructive chronic bronchitis with acute exacerbation with the 2004 code modifications:	R95 COPD (chronic obstructive pulmonary disease)
J44.0 Chronic obstructive pulmonary disease with acute lower respiratory infection	Acute bronchitis with chronic obstructive pulmonary disease (COPD)
J44.1 Chronic obstructive pulmonary disease with acute exacerbation, unspecified	Acute and chronic obstructive bronchitis
J44.8 Other specified chronic obstructive pulmonary disease	Emphysema with acute and chronic bronchitis
J44.9 Chronic obstructive pulmonary disease, unspecified	Acute exacerbation of chronic obstructive pulmonary disease (COPD)
	Excluded: chronic obstructive asthma with acute exacerbation (493.22)
	491.8 Other chronic bronchitis
	496 Chronic airway obstruction, not elsewhere classified

ICD = International Classification of Diseases, with modifications approved by the World Health Organization

ICPC = International Classification of Primary Care (WONCA – World Organization of Family Doctors)