Table 1.
Grouping of respiratory admissions into acute asthma, acute bronchitis/acute bronchiolitis and acute exacerbation of COPD categories according to ICD codes
| ICD9: Asthma | 493.0 | Extrinsic asthma |
| 493.1 | Intrinsic asthma | |
| 493.2 | Chronic obstructive asthma | |
| 493.8 | Other forms of asthma | |
| 493.9 | Asthma, unspecified | |
| ICD10: Asthma | J45.0 | Predominantly allergic asthma |
| J45.1 | Nonallergic asthma | |
| J45.8 | Mixed asthma | |
| J45.9 | Asthma, unspecified | |
| J46 | Status asthmaticus | |
| ICD9: Bronchitis & bronchiolitis | 466.0 | Acute bronchitis |
| 466.1 | Acute bronchiolitis | |
| ICD10: Bronchitis & bronchiolitis | J20.0 | Acute bronchitis due to Mycoplasma pneumoniae |
| J20.1 | Acute bronchitis due to Haemophilus influenzae | |
| J20.2 | Acute bronchitis due to streptococcus | |
| J20.3 | Acute bronchitis due to coxsackievirus | |
| J20.4 | Acute bronchitis due to parainfluenza virus | |
| J20.5 | Acute bronchitis due to respiratory syncytial virus | |
| J20.6 | Acute bronchitis due to rhinovirus | |
| J20.7 | Acute bronchitis due to echovirus | |
| J20.8 | Acute bronchitis due to other specified organisms | |
| J20.9 | Acute bronchitis, unspecified | |
| J21.0 | Acute bronchiolitis due to respiratory syncytial virus | |
| J21.1 | Acute bronchiolitis due to human metapneumovirus | |
| J21.8 | Acute bronchiolitis due to other specified organisms | |
| J21.9 | Acute bronchiolitis, unspecified | |
| J22 | Unspecified acute lower respiratory infection | |
| ICD9: Chronic obstructive pulmonary disease | 491.0 | Simple chronic bronchitis |
| 491.1 | Mucopurulent chronic bronchitis | |
| 491.2 | Obstructive chronic bronchitis | |
| 491.8 | Other chronic bronchitis | |
| 491.9 | Unspecified chronic bronchitis | |
| 492.8 | Other emphysema | |
| ICD10: Chronic obstructive pulmonary disease | J41.0 | Simple chronic bronchitis |
| J41.1 | Mucopurulent chronic bronchitis | |
| J41.8 | Mixed simple and mucopurulent chronic bronchitis | |
| J42 | Unspecified chronic bronchitis | |
| J43 | Emphysema | |
| J44.0 | Chronic obstructive pulmonary disease with acute lower respiratory infection | |
| J44.1 | Chronic obstructive pulmonary disease with acute exacerbation, unspecified | |
| J44.8 | Other specified chronic obstructive pulmonary disease | |
| J44.9 | Chronic obstructive pulmonary disease, unspecified |
COPD, chronic obstructive pulmonary disease; ICD9, International Classification of Diseases, Ninth Revision; ICD10, ICD Tenth Revision.