ICD-10-CM > C00-D49 > C43-C44 > C44 > C44.5 > C44.50 > C44.500 C44.500 Unspecified malignant neoplasm of anal skin Billable/Specific Copy Code Copy Description Applicable To Unspecified malignant neoplasm of anal marginUnspecified malignant neoplasm of perianal skin