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
474 Chronic disease of tonsils and adenoids →
section notes
474.0 Chronic tonsillitis and adenoids →
section notes
474.00   Chronic tonsillitis
474.01   Chronic adenoiditis
474.02   Chronic tonsils&adenoids
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