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
22.5 Other nasal sinusotomy →
section notes
22.50   Sinusotomy NOS
22.51   Ethmoidotomy
22.52   Sphenoidotomy
22.53   Multiple sinus incision
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