ICD-9-CM Vol. 3 Procedure Codes →
5. OPERATIONS ON THE NOSE, MOUTH, AND PHARYNX (21-29) →
section notes
29 Operations on pharynx →
section notes
29.1 Diagnostic procedures on pharynx →
section notes
29.11   Pharyngoscopy
29.12   Pharyngeal biopsy
29.19   Pharyngeal dx proc NEC
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