Convert to ICD-10-CM: 
173.50 converts approximately to:
- 2015/16 ICD-10-CM C44.500 Unspecified malignant neoplasm of anal skinOr: 
- 2015/16 ICD-10-CM C44.501 Unspecified malignant neoplasm of skin of breastOr: 
- 2015/16 ICD-10-CM C44.509 Unspecified malignant neoplasm of skin of other part of trunk