what are cases Medicare would be secondary

Medicare As Secondary Payer Until 1980, Medicare was the primary payer for all Medicare covered services except for services covered by workers’ compensation or black lung benefits or paid for by the Department of Veterans Affairs or other government entities....

How to submit Medicare secondart claims

Medicare Secondary Payer Changes: Paper Claims Effective for claims processed on and after September 1, 2009, the following changes will apply to Medicare Secondary Payer (MSP) paper claims.The charge submitted on the CMS-1500 claim form must match the charge...