72141 vs 72148

Hi While performing MRI LUMBAR SPINE AND MRI CERVICAL SPINE ON SAME DAY ONE PROCEDURE GOT PAID 100% OF ALLOWED AMOUNT AND ANOTHER PROCEDURE GOT PAID ONLY 50% OF THE ALLOWED AMOUNT DUE TO MPPS (MULTIPLE PROCEDURE PAYMENT SYSTEM) PLEASE ADVISE WHETHER WE CAN ADD MODIFIER XS FOR THE ABOVE PROCEDURE OVERRIDE RULE. PLEASE ADVISE
BRADDY

re: 72141 vs 72148

It is typical that the first procedure pays at 100% and the other paid at 50%. No modifier will change the payment amount.