ICD-9-CM Vol. 3 Procedure Codes →
9. OPERATIONS ON THE DIGESTIVE SYSTEM (42-54) →
section notes
49 Operations on anus →
section notes
49.2 Diagnostic procedures on anus and perianal tissue →
section notes
49.21   Anoscopy
49.22   Perianal biopsy
49.23   Anal biopsy
49.29   Anal/perian dx proc NEC
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