ICD-10-CM > C00-D49 > D10-D36 > D12 > D12.9 D12.9 Benign neoplasm of anus and anal canal Billable/Specific Copy Code Copy Description Applicable To Benign neoplasm of anus NOS Type 1 Excludes benign neoplasm of anal margin (D22.5, D23.5)benign neoplasm of anal skin (D22.5, D23.5)benign neoplasm of perianal skin (D22.5, D23.5)