Convert ICD-10 Code C21.0 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
C21.0 Malignant neoplasm of anus, unspecified		154.3 Malignant neo anus NOS

ICD-10 to ICD-9 crosswalk for code C21.0 - malignant neoplasm of anus, unspecified based on the most recent General Equivalence Mappings (GEMS) information.