ICD-9-CM Vol. 3 Procedure Codes →
4. OPERATIONS ON THE EAR (18-20) →
section notes
20 Other operations on middle and inner ear →
section notes
20.2 Incision of mastoid and middle ear →
section notes
20.21   Mastoid incision
20.22   Petrus pyram air cel inc
20.23   Middle ear incision
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