ICD-9-CM Vol. 3 Procedure Codes →
5. OPERATIONS ON THE NOSE, MOUTH, AND PHARYNX (21-29) →
section notes
22 Operations on nasal sinuses →
section notes
22.1 Diagnostic procedures on nasal sinus →
section notes
22.11   Closed nasal sinus bx
22.12   Open biopsy nasal sinus
22.19   Nasal sinus dx proc NEC
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