Novitas recently published a link to a helpful checklist which could help your EMS billers avoid costly rejections due to MSP (Medicare Secondary Payer). The important thing to always remember with MSP claims is that they MUST always balance.
Formula:
Primary Paid + Adjustments = Total Charge
(2320 AMT segment D qualifier) + (2320 or 2430 CAS segment) = 2300 CLM segment