Medicare Secondary Payer Manual (Pub. 100-05), Ch. 6 § 20.1.2
MSP Change Transaction
20.1.2 - MSP Change Transaction
(Rev. 12078; Issued:06-14-23; Effective: 05-29-23; Implementation: 05-29-23)
An MSP change transaction occurs when the key fields on the incoming maintenance
transaction match those on an existing MSP auxiliary occurrence.
An MSP record match occurs when the following items are the same:
Medicare beneficiary identifier;
MSP type;
MSP effective date;
Insurance type; and
Patient relationship
When these items match, the record is overlaid.
No change transactions will be permitted to records established, except for the addition of
a termination date, by any contractor other than the MSP Contractor.