ICD-9-CM Vol. 3 Procedure Codes →
6. OPERATIONS ON THE RESPIRATORY SYSTEM (30-34) →
section notes
31 Other operations on larynx and trachea →
section notes
31.4 Diagnostic procedures on larynx and trachea →
section notes
31.41   Tracheoscopy thru stoma
31.42   Larygnoscopy/tracheoscop
31.43   Closed biopsy larynx
31.44   Closed biopsy trachea
31.45   Opn bx larynx or trachea
31.48   Oth larynx dx procedure
31.49   Oth trachea dx procedure
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