Diagnostic Imaging Coding

Other than wading through the CMS website or spending a fortune for "cross coding" books, where can I find the list of approved Diagnosis codes for Ultrasounds (93306 through 93971) and (76700 through 76870)? i don't mind doing the homework, if someone can head me in the right direction. I want to be sure the DX codes this new company is listing on their superbill are valid for the procedure provided.