21930 versus 27047 excision mass down to subcutaneous tissue buttock

What is the major difference in these codes? 21930-tumor, soft tissue back or flank-CPT® Assist states to use, but 27047-tumor, soft tissue of pelvis & hip area-carries higher RVU's.

re: 21930 versus 27047 excision mass down to subcutaneous tissue buttock

21930 is for excision of a tumor located on the back or flank. 27047 is for excision of tumor located in the pelvis or hip area. The RVU's for these two codes are almost identical (0.54 difference).