ICD-9-CM Vol. 1 Diagnostic Codes
8. DISEASES OF THE RESPIRATORY SYSTEM (460-519)
section notes
OTHER DISEASES OF THE UPPER RESPIRATORY TRACT (470-478)
section notes
473 Chronic sinusitis
section notes
473.0   Chr maxillary sinusitis
473.1   Chr frontal sinusitis
473.2   Chr ethmoidal sinusitis
473.3   Chr sphenoidal sinusitis
473.8   Chronic sinusitis NEC
473.9   Chronic sinusitis NOS
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