When do I use the unspecified codes verse the neoplasm codes? In some cases for example: renal mass, the book leads you to use N28.89 (other specified disorder of kidney/ureter). My doctors say that they think it should be the unspecified neoplasm codes because that is what the mass is and that is a more specified code. Another example would be a penile lesion. Do I use other specified disorder or unspecified neoplasm?