ICD-9-CM Vol. 3 Procedure Codes →
1. OPERATIONS ON THE NERVOUS SYSTEM (01-05) →
section notes
02 Other operations on skull, brain, and cerebral meninges →
section notes
02.2 Ventriculostomy →
section notes
02.21   Insert/replace EVD
02.22   Intrcran vent shunt/anas
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