Instructor’s Guide for ICD-9-CM Diagnostic Coding and ...

The conditions that comprise COPD are obstructive chronic bronchitis, subcategory 491.2, and emphysema, category 492. All asthma codes are under category 493, Asthma. Code 496, chronic airway obstruction, not elsewhere classified, is a nonspecific code that should only be used when the documentation in a medical record does not specify the type of COPD being treated. ................
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