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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