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
20.3 Diagnostic procedures on middle and inner ear →
section notes
20.31   Electrocochleography
20.32   Mid & inner ear biopsy
20.39   Mid/in ear dx proc NEC
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