ICD-9-CM Vol. 3 Procedure Codes →
5. OPERATIONS ON THE NOSE, MOUTH, AND PHARYNX (21-29) →
section notes
21 Operations on nose →
section notes
21.2 Diagnostic procedures on nose →
section notes
21.21   Rhinoscopy
21.22   Nasal biopsy
21.29   Nasal dx proc NEC
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