Medicare Secondary Payer (MSP) Payment Modules (MSPPAY)

50.1 - Medicare Secondary Payer (MSP) Payment Modules (MSPPAY) for Carriers Medicare Secondary Payer (MSP) Payment Modules (MSPPAY) for A/B MACs (Part B) and DME MACs (Rev. 11550; Issued: 08-12-22; Effective: 10-13-22; Implementation:10-13-22) A. Introduction The Part B MSPPAY modules are standardized software A/B MACs (Part B) and DME MACs must use to calculate the secondary payment amount. This ensures consistent MSP payment calculations. The calculations performed by these modules are in accordance with 42 CFR 411.33. Updates to these modules including technical documentation are furnished by CMS, as required.