8. DISEASES OF THE RESPIRATORY SYSTEM (460-519)
Use additional code to identify infectious organism
CHRONIC OBSTRUCTIVE PULMONARY DISEASE AND ALLIED CONDITIONS (490-496)
490: Bronchitis, not specified as acute or chronic
Bronchitis NOS:
catarrhal
with tracheitis NOS
Tracheobronchitis NOS
Excludes:
bronchitis:
allergic NOS (493.9)
asthmatic NOS (493.9)
due to fumes and vapors (506.0)
491: Chronic bronchitis
Excludes:
chronic obstructive asthma (493.2)
492: Emphysema
493: Asthma
Excludes:
wheezing NOS (786.07)
The following fifth-digit subclassification is for use with category 493.0-493.2, 493.9:
0 unspecified
1 with status asthmaticus
2 with (acute) exacerbation
494: Bronchiectasis
Bronchiectasis (fusiform) (postinfectious) (recurrent)
Bronchiolectasis
Excludes:
congenital (748.61)
tuberculous bronchiectasis (current disease) (011.5)
495: Extrinsic allergic alveolitis
Includes:
allergic alveolitis and pneumonitis due to inhaled organic dust particles of fungal, thermophilic actinomycete, or other origin
496: Chronic airway obstruction, not elsewhere classified
Chronic:
nonspecific lung disease
obstructive lung disease
obstructive pulmonary disease [COPD] NOS
Note:
This code is not to be used with any code from categories 491-493
Excludes:
chronic obstructive lung disease [COPD] specified (as) (with):
allergic alveolitis (495.0-495.9)
asthma (493.2)
bronchiectasis (494.0-494.1)
bronchitis (491.20-491.22)
with emphysema (491.20-491.22)
decompensated (491.21)
emphysema (492.0-492.8)

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