What is the correct way to bill for additional sequences on MRIs without contrast? Would modifier "22" be appropriate to append to the base code? I am seeing providers routinely bill multiple entries for the same MRI code using a variety of modifiers along with multiple units tagged onto these base codes. It is my understanding that only one MRI code may be billed for a single MRI performed, and in the rare case where additional sequences are rendered, a modifier "22" would be appropriate. Please advise. Thanks.