Medicare Secondary Payer Manual (Pub. 100-05), Ch. 7 § 10.4
MSP Contractor Correspondence
10.4 – MSP Contractor Correspondence
(Rev. 12438; Issued: 01-04-24; Effective: 02-06-24; Implementation: 02-06-24)
MSP Contractors shall acknowledge and respond to all correspondence within 45 calendar days from the
date of receipt in their corporate mailroom, or in any other mail center location, absent CMS instructions to
the contrary for a particular activity.