ICD-9-CM Volume 2 Index entries containing back-references to
506.2:
- Inflammation, inflamed, inflammatory (with exudation)
respiratory, upper (see also Infection, respiratory, upper) 465.9

chronic, due to external agent - see Condition, respiratory, chronic, due to, external agent
due to

fumes or vapors (chemical) (inhalation) 506.2

radiation 508.1